96 lines
2.7 KiB
C++
96 lines
2.7 KiB
C++
#ifndef DEVICEDHT_H
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#define DEVICEDHT_H
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#include "Device.h"
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#include <Homie.h>
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#include <DHT.h> // https://github.com/adafruit/DHT-sensor-library
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class DeviceDht : public Device {
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public:
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inline DeviceDht(byte dhtPin, byte dhtType):dht(dhtPin, dhtType) {
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pin = dhtPin;
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type = dhtType;
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}
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virtual void setup();
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virtual void homieRegister();
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virtual void loop();
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private:
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byte pin;
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byte type;
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DHT dht;
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const int INTERVAL_DHT = 60;
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unsigned long lastSentDHT = 0;
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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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HomieNode humidityNode{"humidity", "humidity"};
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HomieNode temperatureNode{"temperature", "temperature"};
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HomieNode heatindexNode{"heatindex", "heatindex"};
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};
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void DeviceDht::setup() {
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pinMode(pin, INPUT);
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dht.begin();
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}
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void DeviceDht::homieRegister() {
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Homie.registerNode(humidityNode);
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Homie.registerNode(temperatureNode);
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Homie.registerNode(heatindexNode);
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}
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// compare float values
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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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void DeviceDht::loop() {
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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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humidity = dht.readHumidity(); // read humidity as a percent
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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
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if (isnan(humidity) || isnan(temperature)) {
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Serial.println("Failed to read from DHT sensor!");
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return;
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}
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if (!isEqual(humidity, previousHumidity)) {
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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.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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#endif
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