Things/things/DeviceDht.cpp

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#include "DeviceDht.h"
void DeviceDht::deviceSetup() {
pinMode(pin, INPUT);
dht.begin();
}
void DeviceDht::deviceRegister() {
Homie.registerNode(humidityNode);
Homie.registerNode(temperatureNode);
Homie.registerNode(heatindexNode);
}
// compare float values
bool isEqual(float a, float b, float epsilon=0.001) {
return fabs(a - b) <= epsilon * fabs(a);
}
void DeviceDht::deviceLoop() {
if (millis() - lastSentDHT >= INTERVAL_DHT * 1000UL || lastSentDHT == 0) {
float previousHumidity = humidity;
float previousTemperature = temperature;
float previousHeatindex = heatindex;
humidity = dht.readHumidity(); // read humidity as a percent
temperature = dht.readTemperature(); // read temperature as Celsius
heatindex = dht.computeHeatIndex(temperature, humidity, false);
// check if any reads failed and exit early
if (isnan(humidity) || isnan(temperature)) {
Serial.println("Failed to read from DHT sensor!");
return;
}
if (!isEqual(humidity, previousHumidity)) {
Serial.print("humidity: ");
Serial.println(humidity);
if (!Homie.setNodeProperty(humidityNode, "value", String(humidity), true)) {
Serial.println("Sending failed");
}
} else {
Serial.println("humidity unchanged");
}
if (!isEqual(temperature, previousTemperature)) {
Serial.print("temperature: ");
Serial.println(temperature);
if (!Homie.setNodeProperty(temperatureNode, "value", String(temperature), true)) {
Serial.println("Sending failed");
}
} else {
Serial.println("temperature unchanged");
}
if (!isEqual(heatindex, previousHeatindex)) {
Serial.print("heatindex: ");
Serial.println(heatindex);
if (!Homie.setNodeProperty(heatindexNode, "value", String(heatindex), true)) {
Serial.println("Sending failed");
}
} else {
Serial.println("heatindex unchanged");
}
lastSentDHT = millis();
}
}