esp32max44009.txt

#include<Wire.h>

#define Addr 0x4A

void setup()
{

Wire.begin();
// Initialise serial communication
Serial.begin(9600);

Wire.beginTransmission(Addr);
Wire.write(0x02);
Wire.write(0x40);
Wire.endTransmission();
delay(300);
}

void loop()
{
unsigned int data[2];
Wire.beginTransmission(Addr);
Wire.write(0x03);
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 * 0.045;

Serial.print("Ambient Light luminance :");
Serial.print(luminance);
Serial.println(" lux");
delay(500);
}