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arduino-cli/libraries/MAX44009_Soft/MAX44009_Soft.cpp

@@ -0,0 +1,56 @@
+#include "MAX44009_Soft.h"
+//#include <math.h>  //use for pow() function
+#include <SoftwareWire.h>
+
+MAX44009_Soft::MAX44009_Soft() {}
+
+int MAX44009_Soft::begin(SoftwareWire *theWire)
+{
+	_wire = theWire;
+	_wire->beginTransmission(MAX_ADDR);
+	_wire->write(0x02);
+	_wire->write(0x00); // changed from 0x40
+	
+	return _wire->endTransmission();
+}
+
+
+float MAX44009_Soft::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_Soft/MAX44009_Soft.h

@@ -0,0 +1,22 @@
+#ifndef MAX44009_Soft_h
+#define MAX44009_Soft_h
+#include <Arduino.h>
+#include <SoftwareWire.h>
+
+#define MAX_ADDR 0x4A // or 0x4B if A0 pin connected to Vcc
+
+class MAX44009_Soft {
+    public:
+		MAX44009_Soft();
+		
+		int begin(SoftwareWire *theWire);
+		        
+		float get_lux(void);
+		
+	private:
+		SoftwareWire *_wire;
+};
+
+
+
+#endif