ZsensorTEMT6000.ino

/*  
  Theengs OpenMQTTGateway - We Unite Sensors in One Open-Source Interface

   Act as a gateway between your 433mhz, infrared IR, BLE, LoRa signal and one interface like an MQTT broker 
   Send and receiving command by MQTT
 
   This is the Light Meter Addon based on modules with a TEMT6000:
   - Measures ambient Light Intensity in Lux (lx), Foot Candela (ftcd) and Watt/m^2 (wattsm2)
   - Required Hardware Module: TEMT6000
   - Dependencies: none

   Connection Scheme:
   --------------------

   TEMT6000------> ESP8266
   ==============================================
   Vcc ---------> 3.3V
   GND ---------> GND
   SIG ---------> A0

    Copyright: (c) Andre Greyling - this is a modified copy of Chris Broekema
  
    This file is part of OpenMQTTGateway.
    
    OpenMQTTGateway is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    OpenMQTTGateway is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "User_config.h"

#ifdef ZsensorTEMT6000

#  include "Wire.h"
#  include "math.h"

void setupZsensorTEMT6000() {
  Log.notice(F("Setup TEMT6000 on pin: %i" CR), TEMT6000LIGHTSENSORPIN);
  pinMode(TEMT6000LIGHTSENSORPIN, INPUT);
}

void MeasureLightIntensityTEMT6000() {
  if (millis() > (timetemt6000 + TimeBetweenReadingtemt6000)) {
    static uint32_t persisted_lux;
    timetemt6000 = millis();

    Log.trace(F("Creating TEMT6000 buffer" CR));
    StaticJsonDocument<JSON_MSG_BUFFER> TEMT6000dataBuffer;
    JsonObject TEMT6000data = TEMT6000dataBuffer.to<JsonObject>();

    float volts = analogRead(TEMT6000LIGHTSENSORPIN) * 5.0 / 1024.0;
    float amps = volts / 10000.0; // across 10,000 Ohms
    float microamps = amps * 1000000;
    float lux = microamps * 2.0;

    if (persisted_lux != lux || temt6000_always) {
      persisted_lux = lux;

      TEMT6000data["lux"] = (float)lux;
      TEMT6000data["ftcd"] = (float)(lux) / 10.764;
      TEMT6000data["wattsm2"] = (float)(lux) / 683.0;
      TEMT6000data["origin"] = subjectTEMT6000toMQTT;
      handleJsonEnqueue(TEMT6000data);
    } else {
      Log.trace(F("Same lux value, do not send" CR));
    }
  }
}
#endif