Things/things/DeviceLdr.h

#ifndef DEVICELDR_H
#define DEVICELDR_H

#include "Device.h"
#include <Homie.h>

class DeviceLdr : public Device {
  public:
    inline DeviceLdr(byte ldrPin) {
      pin = ldrPin;
    }
    virtual void setup();
    virtual void homieRegister();
    virtual void loop();
  private:
    byte pin;
    const int INTERVAL_LDR = 60;
    unsigned long lastSentLDR = 0;
    int ldr = 0;
    HomieNode ldrNode = HomieNode("ldr", "ldr");
};

void DeviceLdr::setup() {
  pinMode(pin, INPUT);
}

void DeviceLdr::homieRegister() {
  Homie.registerNode(ldrNode);
}

void DeviceLdr::loop() {
  if (millis() - lastSentLDR >= INTERVAL_LDR * 1000UL || lastSentLDR == 0) {
    int ldr_new = analogRead(pin);
    if (ldr_new != ldr) {
      ldr = ldr_new;
      float ldr_float = map(ldr, 0, 1023, 0, 10000) / 100.0;
      Serial.print("LDR: ");
      Serial.println(ldr_float);
      if (!Homie.setNodeProperty(ldrNode, "value", String(ldr_float), true)) {
        Serial.println("Sending failed");
      }
    } else {
      Serial.println("LDR value unchanged");
    }
    lastSentLDR = millis();
  }
}

#endif