complete rewrite, now based on homie-esp8266
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569
things.ino
569
things.ino
@ -1,85 +1,86 @@
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// based on example code from the used libraries
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#include <Homie.h> // https://github.com/marvinroger/homie-esp8266
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#include <DHT.h> // https://github.com/adafruit/DHT-sensor-library
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#include <FS.h> // this needs to be first, or it all crashes and burns...
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extern "C" {
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#include <user_interface.h>
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}
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#include <ESP8266WiFi.h> // https://github.com/esp8266/Arduino
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#include <ESP8266WebServer.h>
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#include <WiFiManager.h> // https://github.com/tzapu/WiFiManager
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#include <DNSServer.h>
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#include <Ticker.h>
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#include <PubSubClient.h> // https://github.com/knolleary/pubsubclient
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#include <DHT.h> // https://github.com/adafruit/DHT-sensor-library
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#include <ArduinoJson.h> // https://github.com/bblanchon/ArduinoJson
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#define HAS_LDR
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#define HAS_LED
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#undef HAS_DHT
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#define HARDWARE_WITTY
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// HAS_LED
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#define PIN_LED_RED D8
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#define PIN_LED_GREEN D6
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#define PIN_LED_BLUE D7
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HomieNode ledNode("led", "rgb");
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int led_red = 0;
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int led_green = 0;
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int led_blue = 0;
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// configure DHT sensor
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#define DHTPIN D4 // what pin the DHT is connected to
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//#define DHTTYPE DHT11 // DHT11
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//#define DHTTYPE DHT21 // DHT21 (AM2301)
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#define DHTTYPE DHT22 // DHT22 (AM2302)
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// HAS_LDR
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#define PIN_LDR A0
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HomieNode ldrNode("ldr", "ldr");
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const int INTERVAL_LDR = 60;
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unsigned long lastSentLDR = 0;
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int ldr = 0;
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#ifdef HARDWARE_WITTY
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#define CONFIGPIN D2 // config-button is connected to this pin
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#else
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#define CONFIGPIN D3 // config-button is connected to this pin
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#endif
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// HAS_DHT
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#define PIN_DHT D4
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#define TYPE_DHT DHT22
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HomieNode humidityNode("humidity", "humidity");
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HomieNode temperatureNode("temperature", "temperature");
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HomieNode heatindexNode("heatindex", "heatindex");
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const int INTERVAL_DHT = 60;
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unsigned long lastSentDHT = 0;
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DHT dht(PIN_DHT, TYPE_DHT);
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float humidity, temperature; // raw values from the sensor
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float heatindex; // computed value from the sensor
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#define RGBRED D8 // red led channel on witty module
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#define RGBGRN D6 // green led channel on witty module
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#define RGBBLU D7 // blue led channel on witty module
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#define LDRPIN A0 // analog LDR input on witty module
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// define default values here, overwritten by values from config.json
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char mqtt_server[40];
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char mqtt_port[6] = "1883";
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char mqtt_topic[34] = "OutTopic";
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bool capability_dht = true;
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bool capability_ldr = true;
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bool capability_rgb = true;
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// flag for saving data
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bool shouldSaveConfig = false;
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// callback notifying us of the need to save config
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void saveConfigCallback() {
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Serial.println("Should save config");
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shouldSaveConfig = true;
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void setupHandler() {
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#ifdef HAS_LDR
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pinMode(PIN_LDR, INPUT);
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#endif
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#ifdef HAS_LED
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pinMode(PIN_LED_RED, OUTPUT);
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pinMode(PIN_LED_GREEN, OUTPUT);
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pinMode(PIN_LED_BLUE, OUTPUT);
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analogWrite(PIN_LED_RED, led_red);
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analogWrite(PIN_LED_GREEN, led_green);
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analogWrite(PIN_LED_BLUE, led_blue);
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#endif
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#ifdef HAS_DHT
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dht.begin();
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#endif
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}
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// initialize modules
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ESP8266WebServer http_server(80); // webserver
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DHT dht(DHTPIN, DHTTYPE); // DHT sensor
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Ticker ticker; // LED status
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bool ledColorHandler(String message) {
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DynamicJsonBuffer json_inBuffer;
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JsonObject& json_in = json_inBuffer.parseObject(message);
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if (json_in.success()) {
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if (json_in.containsKey("red")) {
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led_red = json_in["red"];
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analogWrite(PIN_LED_RED, led_red);
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}
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if (json_in.containsKey("green")) {
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led_green = json_in["green"];
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analogWrite(PIN_LED_GREEN, led_green);
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}
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if (json_in.containsKey("blue")) {
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led_blue = json_in["blue"];
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analogWrite(PIN_LED_BLUE, led_blue);
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}
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} else {
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Serial.println("parsing of JSON failed");
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}
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WiFiClient wifiClient;
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PubSubClient mqtt_client(wifiClient);
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bool dhtvalid = false; // indicate if measurement is valid
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float humidity, temperature; // raw values from the sensor
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float heatindex; // computed value from the sensor
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char str_humidity[10], str_temperature[10]; // rounded values as strings
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char str_heatindex[10]; // rounded value as string
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unsigned long previousMillis = 0; // last sensor read
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const long interval = 2000; // interval between readings
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long lastMsg = 0;
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// toggle LED state
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void toggle_led() {
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int state = digitalRead(BUILTIN_LED); // get the current state LED
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digitalWrite(BUILTIN_LED, !state); // set the opposite state
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}
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// gets called when WiFiManager enters configuration mode
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void configModeCallback (WiFiManager *myWiFiManager) {
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Serial.println("Entered config mode");
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Serial.println(WiFi.softAPIP());
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Serial.println(myWiFiManager->getConfigPortalSSID());
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ticker.attach(0.1, toggle_led); // toggle led faster
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DynamicJsonBuffer json_outBuffer;
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JsonObject& json_out = json_outBuffer.createObject();
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json_out["red"] = led_red;
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json_out["green"] = led_green;
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json_out["blue"] = led_blue;
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String response;
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json_out.printTo(response);
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Serial.print("led state: ");
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Serial.println(response);
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Homie.setNodeProperty(ledNode, "color", response);
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return true;
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}
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// compare float values
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@ -87,22 +88,26 @@ bool isEqual(float a, float b, float epsilon=0.001) {
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return fabs(a - b) <= epsilon * fabs(a);
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}
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// concatenate MQTT topic prefix to individual topic
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char* topic(const char* this_topic) {
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static char topic[34];
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strcpy(topic, mqtt_topic);
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strcat(topic, "/");
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strcat(topic, this_topic);
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return topic;
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void loopHandlerLDR() {
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if (millis() - lastSentLDR >= INTERVAL_LDR * 1000UL || lastSentLDR == 0) {
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int ldr_new = analogRead(PIN_LDR);
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if (ldr_new != ldr) {
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ldr = ldr_new;
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float ldr_float = map(ldr, 0, 1023, 0, 10000) / 100.0;
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Serial.print("LDR: ");
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Serial.println(ldr_float);
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if (!Homie.setNodeProperty(ldrNode, "value", String(ldr_float), true)) {
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Serial.println("Sending failed");
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}
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} else {
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Serial.println("LDR value unchanged");
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}
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lastSentLDR = millis();
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}
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}
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// get values from DHT sensor
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void read_sensor() {
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// wait at least 2 seconds seconds between measurements
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unsigned long currentMillis = millis();
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if (currentMillis - previousMillis >= interval) {
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previousMillis = currentMillis;
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void loopHandlerDHT() {
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if (millis() - lastSentDHT >= INTERVAL_DHT * 1000UL || lastSentDHT == 0) {
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float previousHumidity = humidity;
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float previousTemperature = temperature;
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float previousHeatindex = heatindex;
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@ -110,356 +115,74 @@ void read_sensor() {
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temperature = dht.readTemperature(); // read temperature as Celsius
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heatindex = dht.computeHeatIndex(temperature, humidity, false);
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// check if any reads failed and exit early (to try again)
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// check if any reads failed and exit early
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if (isnan(humidity) || isnan(temperature)) {
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dhtvalid = false;
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Serial.println("Failed to read from DHT sensor!");
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strcpy(str_humidity, "invalid");
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strcpy(str_temperature, "invalid");
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strcpy(str_heatindex, "invalid");
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return;
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} else {
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dhtvalid = true;
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}
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// convert the floats to strings and round to 2 decimal places
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dtostrf(humidity, 1, 2, str_humidity);
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dtostrf(temperature, 1, 2, str_temperature);
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dtostrf(heatindex, 1, 2, str_heatindex);
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if (!isEqual(humidity, previousHumidity)) {
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mqtt_client.publish(topic("humidity"), str_humidity);
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}
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if (!isEqual(temperature, previousTemperature)) {
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mqtt_client.publish(topic("temperature"), str_temperature);
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}
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if (!isEqual(heatindex, previousHeatindex)) {
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mqtt_client.publish(topic("heatindex"), str_heatindex);
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}
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Serial.print("Humidity: ");
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Serial.print(str_humidity);
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Serial.print(" %\t");
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Serial.print("Temperature: ");
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Serial.print(str_temperature);
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Serial.print(" °C\t");
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Serial.print("Heat Index: ");
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Serial.print(str_heatindex);
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Serial.println(" °C");
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}
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}
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// callback for MQTT, gets called if we receive a message
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void mqtt_callback(char* topic, byte* payload, unsigned int length) {
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char inData[length+1];
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for(int i = 0; i < length; i++) {
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inData[i] = (char)payload[i];
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}
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inData[length] = 0;
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Serial.print("Message arrived [");
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Serial.print(topic);
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Serial.print("] ");
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Serial.println(inData);
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StaticJsonBuffer<200> jsonBuffer;
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JsonObject& json = jsonBuffer.parseObject(inData);
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analogWrite(RGBRED, json["red"]);
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analogWrite(RGBGRN, json["green"]);
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analogWrite(RGBBLU, json["blue"]);
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}
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// make sure we're connected to MQTT broker
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void mqtt_reconnect() {
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// loop until we're reconnected
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while (!mqtt_client.connected()) {
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Serial.print("Attempting MQTT connection...");
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// attempt to connect
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if (mqtt_client.connect(wifi_station_get_hostname(), topic("online"), MQTTQOS1, true, "0")) {
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Serial.println("connected");
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// once connected, publish an announcement...
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mqtt_client.publish(topic("online"), "1", true);
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// ... and resubscribe:
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mqtt_client.subscribe("setrgb");
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Serial.print("humidity: ");
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Serial.println(humidity);
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if (!Homie.setNodeProperty(humidityNode, "value", String(humidity), true)) {
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Serial.println("Sending failed");
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}
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} else {
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Serial.print("failed, rc=");
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Serial.print(mqtt_client.state());
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Serial.println(" try again in 5 seconds");
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delay(5000);
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Serial.println("humidity unchanged");
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}
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if (!isEqual(temperature, previousTemperature)) {
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Serial.print("temperature: ");
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Serial.println(temperature);
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if (!Homie.setNodeProperty(temperatureNode, "value", String(temperature), true)) {
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Serial.println("Sending failed");
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}
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} else {
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Serial.println("temperature unchanged");
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}
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if (!isEqual(heatindex, previousHeatindex)) {
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Serial.print("heatindex: ");
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Serial.println(heatindex);
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if (!Homie.setNodeProperty(heatindexNode, "value", String(heatindex), true)) {
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Serial.println("Sending failed");
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}
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} else {
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Serial.println("heatindex unchanged");
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}
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lastSentDHT = millis();
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}
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}
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// convert string to integer
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int stringToNumber(String thisString) {
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int i, value, length;
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length = thisString.length();
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char blah[(length + 1)];
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for (i = 0; i < length; i++) {
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blah[i] = thisString.charAt(i);
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}
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blah[i] = 0;
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value = atoi(blah);
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return value;
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void loopHandler() {
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#ifdef HAS_LDR
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loopHandlerLDR();
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#endif
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#ifdef HAS_DHT
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loopHandlerDHT();
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#endif
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}
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void setup() {
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// put your setup code here, to run once:
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Serial.begin(9600);
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pinMode(BUILTIN_LED, OUTPUT); // set led pin as output
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ticker.attach(0.5, toggle_led); // toggle led slowly during initialization
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pinMode(RGBRED, OUTPUT);
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pinMode(RGBGRN, OUTPUT);
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pinMode(RGBBLU, OUTPUT);
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pinMode(CONFIGPIN, INPUT); // flash-button on nodemcu
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pinMode(LDRPIN, INPUT);
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// clean FS, for testing
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//SPIFFS.format();
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// read configuration from FS json
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Serial.println("mounting FS...");
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if (SPIFFS.begin()) {
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Serial.println("mounted file system");
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if (SPIFFS.exists("/config.json")) {
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// file exists, reading and loading
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Serial.println("reading config file");
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File configFile = SPIFFS.open("/config.json", "r");
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if (configFile) {
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Serial.println("opened config file");
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size_t size = configFile.size();
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// allocate a buffer to store contents of the file.
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std::unique_ptr<char[]> buf(new char[size]);
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configFile.readBytes(buf.get(), size);
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DynamicJsonBuffer jsonBuffer;
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JsonObject& json = jsonBuffer.parseObject(buf.get());
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json.printTo(Serial);
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if (json.success()) {
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Serial.println("\nparsed json");
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strcpy(mqtt_server, json["mqtt_server"]);
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strcpy(mqtt_port, json["mqtt_port"]);
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strcpy(mqtt_topic, json["mqtt_topic"]);
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capability_dht = json["capability_dht"];
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capability_ldr = json["capability_ldr"];
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capability_rgb = json["capability_rgb"];
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} else {
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Serial.println("failed to load json config");
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}
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}
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}
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} else {
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Serial.println("failed to mount FS");
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}
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// WiFiManager
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// extra parameters to be configured
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WiFiManagerParameter custom_mqtt_server("server", "mqtt server", mqtt_server, 40);
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WiFiManagerParameter custom_mqtt_port("port", "mqtt port", mqtt_port, 5);
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WiFiManagerParameter custom_mqtt_topic("topic", "mqtt topic", mqtt_topic, 32);
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WiFiManagerParameter custom_capability_dht("dht", "capability dht", capability_dht ? "true" : "false", 5);
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WiFiManagerParameter custom_capability_ldr("ldr", "capability ldr", capability_ldr ? "true" : "false", 5);
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WiFiManagerParameter custom_capability_rgb("rgb", "capability rgb", capability_rgb ? "true" : "false", 5);
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// local intialization
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WiFiManager wifiManager;
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// reset settings if config-button is pressed
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if (!digitalRead(CONFIGPIN)) {
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Serial.println("config-button pressed, resetting wifi settings");
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wifiManager.resetSettings();
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}
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// set callback that gets called when connecting to previous WiFi fails, and enters Access Point mode
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wifiManager.setAPCallback(configModeCallback);
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// set config save notify callback
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wifiManager.setSaveConfigCallback(saveConfigCallback);
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// add all your parameters here
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wifiManager.addParameter(&custom_mqtt_server);
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wifiManager.addParameter(&custom_mqtt_port);
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wifiManager.addParameter(&custom_mqtt_topic);
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wifiManager.addParameter(&custom_capability_dht);
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wifiManager.addParameter(&custom_capability_ldr);
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wifiManager.addParameter(&custom_capability_rgb);
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// fetches ssid and pass and tries to connect
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// if it does not connect it starts an access point
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if (!wifiManager.autoConnect()) {
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Serial.println("failed to connect and hit timeout");
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// reset and try again
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ESP.reset();
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delay(1000);
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}
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Serial.println("connected to WiFi");
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ticker.detach();
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digitalWrite(BUILTIN_LED, LOW);
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// read updated parameters
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strcpy(mqtt_server, custom_mqtt_server.getValue());
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strcpy(mqtt_port, custom_mqtt_port.getValue());
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strcpy(mqtt_topic, custom_mqtt_topic.getValue());
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capability_dht = custom_capability_dht.getValue()[0] == 't';
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capability_ldr = custom_capability_ldr.getValue()[0] == 't';
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capability_rgb = custom_capability_rgb.getValue()[0] == 't';
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// save the custom parameters to FS
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if (shouldSaveConfig) {
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Serial.println("saving config");
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DynamicJsonBuffer jsonBuffer;
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JsonObject& json = jsonBuffer.createObject();
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json["mqtt_server"] = mqtt_server;
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json["mqtt_port"] = mqtt_port;
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json["mqtt_topic"] = mqtt_topic;
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json["capability_dht"] = capability_dht;
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json["capability_ldr"] = capability_ldr;
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json["capability_rgb"] = capability_rgb;
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File configFile = SPIFFS.open("/config.json", "w");
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if (!configFile) {
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Serial.println("failed to open config file for writing");
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}
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json.printTo(Serial);
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json.printTo(configFile);
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configFile.close();
|
||||
}
|
||||
|
||||
mqtt_client.setServer(mqtt_server, stringToNumber(mqtt_port));
|
||||
mqtt_client.setCallback(mqtt_callback);
|
||||
|
||||
dht.begin();
|
||||
|
||||
// initial read
|
||||
read_sensor();
|
||||
mqtt_client.publish(topic("humidity"), str_humidity);
|
||||
mqtt_client.publish(topic("temperature"), str_temperature);
|
||||
mqtt_client.publish(topic("heatindex"), str_heatindex);
|
||||
|
||||
// handle http requests
|
||||
http_server.on("/", [](){
|
||||
read_sensor();
|
||||
String response = "<!DOCTYPE HTML>\r\n";
|
||||
response += "<html lang=\"en\">\r\n";
|
||||
response += "<head>\r\n";
|
||||
response += "<meta http-equiv=\"content-type\" content=\"text/html; charset=windows-1252\">\r\n";
|
||||
response += "<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">\r\n";
|
||||
response += "<title>Status</title>\r\n";
|
||||
response += "<style>\r\n";
|
||||
response += "div,input{padding:5px;font-size:1em;}\r\n";
|
||||
response += "input{width:95%;}\r\n";
|
||||
response += "body{text-align:center;font-family:verdana;}\r\n";
|
||||
response += "button{border:0;border-radius:0.3rem;background-color:#1fa3ec;color:#fff;line-height:2.4rem;font-size:1.2rem;width:100%;}\r\n";
|
||||
response += "</style>\r\n";
|
||||
response += "</head>\r\n";
|
||||
response += "<body>\r\n";
|
||||
response += "<div style=\"text-align: left; display: inline-block;\">\r\n";
|
||||
response += "<h1>";
|
||||
response += mqtt_topic;
|
||||
response += "</h1>\r\n";
|
||||
response += "<h3>Sensor Status</h3>\r\n";
|
||||
response += "<table>\r\n";
|
||||
response += "<tr><td>MQTT Server</td><td>";
|
||||
response += mqtt_server;
|
||||
response += ":";
|
||||
response += mqtt_port;
|
||||
if (capability_dht) {
|
||||
response += "<tr><td>Temperature</td><td>";
|
||||
response += str_temperature;
|
||||
response += "°C</td></tr>\r\n";
|
||||
response += "<tr><td>Humidity</td><td>";
|
||||
response += str_humidity;
|
||||
response += "%RH</td></tr>\r\n";
|
||||
response += "<tr><td>Heat Index</td><td>";
|
||||
response += str_heatindex;
|
||||
response += "°C</td></tr>\r\n";
|
||||
}
|
||||
response += "</table>\r\n";
|
||||
response += "<form action=\"/\" method=\"get\"><button>Reload</button></form>\r\n";
|
||||
response += "</div>\r\n";
|
||||
response += "</body>\r\n";
|
||||
response += "</html>\n";
|
||||
http_server.send(200, "text/html", response);
|
||||
delay(100);
|
||||
});
|
||||
|
||||
http_server.on("/values", [](){
|
||||
read_sensor();
|
||||
String response = "updatetime\t";
|
||||
response += previousMillis;
|
||||
response += "\n";
|
||||
response += "temperature\t";
|
||||
response += str_temperature;
|
||||
response += "\n";
|
||||
response += "humidity\t";
|
||||
response += str_humidity;
|
||||
response += "\n";
|
||||
response += "heatindex\t";
|
||||
response += str_heatindex;
|
||||
response += "\n";
|
||||
http_server.send(200, "text/plain", response);
|
||||
delay(100);
|
||||
});
|
||||
|
||||
http_server.on("/json", [](){
|
||||
read_sensor();
|
||||
DynamicJsonBuffer jsonBuffer;
|
||||
JsonObject& json = jsonBuffer.createObject();
|
||||
JsonObject& mqtt = json.createNestedObject("mqtt");
|
||||
mqtt["server"] = mqtt_server;
|
||||
mqtt["port"] = mqtt_port;
|
||||
mqtt["topic"] = mqtt_topic;
|
||||
if (capability_dht) {
|
||||
JsonObject& dht = json.createNestedObject("dht");
|
||||
dht["temperature"] = str_temperature;
|
||||
dht["humidity"] = str_humidity;
|
||||
dht["heatindex"] = str_heatindex;
|
||||
}
|
||||
String response;
|
||||
json.printTo(response);
|
||||
http_server.send(200, "text/plain", response);
|
||||
delay(100);
|
||||
});
|
||||
|
||||
http_server.on("/config", [](){
|
||||
read_sensor();
|
||||
DynamicJsonBuffer jsonBuffer;
|
||||
JsonObject& json = jsonBuffer.createObject();
|
||||
JsonObject& mqtt = json.createNestedObject("mqtt");
|
||||
mqtt["server"] = mqtt_server;
|
||||
mqtt["port"] = mqtt_port;
|
||||
mqtt["topic"] = mqtt_topic;
|
||||
JsonObject& capability = json.createNestedObject("capability");
|
||||
capability["dht"] = capability_dht;
|
||||
capability["ldr"] = capability_ldr;
|
||||
capability["rgb"] = capability_rgb;
|
||||
String response;
|
||||
json.printTo(response);
|
||||
http_server.send(200, "text/plain", response);
|
||||
delay(100);
|
||||
});
|
||||
|
||||
// start the web server
|
||||
http_server.begin();
|
||||
Serial.println("HTTP server started");
|
||||
Homie.setFirmware("things", "1.0.0");
|
||||
#ifdef HAS_LDR
|
||||
Homie.registerNode(ldrNode);
|
||||
#endif
|
||||
#ifdef HAS_LED
|
||||
ledNode.subscribe("color", ledColorHandler);
|
||||
Homie.registerNode(ledNode);
|
||||
#endif
|
||||
#ifdef HAS_DHT
|
||||
Homie.registerNode(humidityNode);
|
||||
Homie.registerNode(temperatureNode);
|
||||
Homie.registerNode(heatindexNode);
|
||||
#endif
|
||||
Homie.setSetupFunction(setupHandler);
|
||||
Homie.setLoopFunction(loopHandler);
|
||||
Homie.setup();
|
||||
}
|
||||
|
||||
void loop() {
|
||||
// listen for http requests
|
||||
http_server.handleClient();
|
||||
|
||||
if (!mqtt_client.connected()) {
|
||||
mqtt_reconnect();
|
||||
}
|
||||
mqtt_client.loop();
|
||||
|
||||
long now = millis();
|
||||
if (now - lastMsg > 10000) {
|
||||
lastMsg = now;
|
||||
read_sensor();
|
||||
}
|
||||
Homie.loop();
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user