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arduino-cli/libraries/MAX44009/src/MAX44009.cpp

@@ -0,0 +1,54 @@
+#include "MAX44009.h"
+//#include <math.h>  //use for pow() function
+
+MAX44009::MAX44009() {}
+
+int MAX44009::begin()
+{
+	Wire.beginTransmission(MAX_ADDR);
+	Wire.write(0x02);
+	Wire.write(0x00); // changed from 0x40
+	
+	return Wire.endTransmission();
+}
+
+
+float MAX44009::get_lux(void)
+{
+	unsigned int data[2];
+	
+	Wire.beginTransmission(MAX_ADDR);
+	Wire.write(0x03); //request high-byte register data
+	Wire.endTransmission();
+
+	// Request 1 byte of data
+	Wire.requestFrom(MAX_ADDR, 1);
+
+	// Read first byte of data
+	if (Wire.available() == 1)
+	{
+		data[0] = Wire.read();
+	}
+
+    	Wire.beginTransmission(MAX_ADDR);
+	Wire.write(0x04); //request low-byte register data
+	Wire.endTransmission();
+
+	// Request 1 byte of data
+	Wire.requestFrom(MAX_ADDR, 1);
+
+	// Read second byte of data
+	if (Wire.available() == 1)
+	{
+		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;
+	float luminance = (float)(((0x00000001 << exponent) * (float)mantissa) * 0.045);
+	
+	return luminance; 
+}

arduino-cli/libraries/MAX44009/src/MAX44009.h

@@ -0,0 +1,20 @@
+#ifndef MAX44009_h
+#define MAX44009_h
+#include <Arduino.h>
+#include <Wire.h>
+
+#define MAX_ADDR 0x4A // or 0x4B if A0 pin connected to Vcc
+
+class MAX44009 {
+    public:
+		MAX44009();
+		
+		int begin();
+		        
+		float get_lux(void);
+		
+};
+
+
+
+#endif