esp32_GY49_MAX44009

esp32_GY49_MAX44009.cpp

/*
  Florin Simedru
  Complete project details at https://automatic-house.blogspot.com
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files.
  
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
*/

/*

; PlatformIO Project Configuration File
;
;   Build options: build flags, source filter
;   Upload options: custom upload port, speed and extra flags
;   Library options: dependencies, extra library storages
;   Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html

[platformio]
default_envs = esp32doit-devkit-v1

[env]
monitor_port = COM7

[env:esp32doit-devkit-v1]
platform = espressif32
board = esp32doit-devkit-v1
framework = arduino
monitor_speed = 115200
upload_port = COM7
lib_deps = mbed-components/[email protected]+sha.cf4d7779d9d6

*/

#include <Arduino.h>
#include "BluetoothSerial.h"
#include<Wire.h>

// Check if Bluetooth configs are enabled
#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
#error Bluetooth is not enabled! Please run `make menuconfig` to and enable it
#endif

// MAX44009 I2C address is 0x4A(74)
#define Addr 0x4A
#define LED_PIN LED_BUILTIN 

// Bluetooth Serial object
BluetoothSerial SerialBT;
// Handle received and sent messages
String message = "";
char incomingChar;
String lightString;
// Timer: auxiliar variables
unsigned long previousMillis = 0;    // Stores last time temperature was published
const long interval = 10000;         // interval at which to publish sensor readings

void setup()
{
  // Initialise I2C communication as MASTER
  Wire.begin();
  // Initialise serial communication, set baud rate = 9600
  Serial.begin(115200);
  // Bluetooth device name
  SerialBT.begin("ESP32_LIGH_SENZOR");

  // Start I2C Transmission
  Wire.beginTransmission(Addr);
  // Select configuration register
  Wire.write(0x02);
  // Continuous mode, Integration time = 800 ms
  Wire.write(0x40);
  // Stop I2C transmission
  Wire.endTransmission();
  /* Initialize Buildin led pin (D2) for output */
  pinMode(LED_PIN,OUTPUT);
  delay(300);
}

void loop()
{
  unsigned int data[2];
  unsigned long currentMillis = millis();

  // Start I2C Transmission
  Wire.beginTransmission(Addr);
  // Select data register
  Wire.write(0x03);
  // Stop I2C transmission
  Wire.endTransmission();

  // Request 2 bytes of data
  Wire.requestFrom(Addr, 2);

  // Read 2 bytes of data
  // luminance msb, luminance lsb
  if (Wire.available() == 2)
  {
    data[0] = Wire.read();
    data[1] = Wire.read();
  }

  // Convert the data to lux
  int exponent = (data[0] & 0xF0) >> 4;
  int mantissa = ((data[0] & 0x0F) << 4) | (data[1] & 0x0F);
  float luminance = pow(2, exponent) * mantissa * 0.72;

  // Output data to serial monitor
  lightString = "Ambient Light luminance : "+String(luminance)+" lux";

  Serial.println(lightString);

  // Send light luminance readings
  if (currentMillis - previousMillis >= interval){
    previousMillis = currentMillis;

    SerialBT.println(lightString); 
  }
  // Read received messages (LED control command)
  if (SerialBT.available()){
    char incomingChar = SerialBT.read();
    if (incomingChar != '\n'){
      message += String(incomingChar);
    }
    else{
      message = "";
    }
  }
  if(message.isEmpty()==false)
  {
    // Check received message and control output accordingly
    if (message.equals("led_on") && message.endsWith("n"))
    {
      digitalWrite(LED_PIN, HIGH);
      Serial.println(message);  
    }
    else if (message.equals("led_off")&& message.endsWith("f"))
    {
      digitalWrite(LED_PIN, LOW);
      Serial.println(message);  
    }
  }
  delay(500);
}