Datasheet

Upload this sketch to your Arduino, and keep it connected to your computer. Don't forget to power the MAX9744 with

5-12VDC separately via the DC jack!

#include <Wire.h>

// 0x4B is the default i2c address

#define MAX9744_I2CADDR 0x4B

// We'll track the volume level in this variable.

int8_t thevol = 31;

void setup() {

Serial.begin(9600);

Serial.println("MAX9744 demo");

Wire.begin();

if (! setvolume(thevol)) {

Serial.println("Failed to set volume, MAX9744 not found!");

while (1);

}

// Setting the volume is very simple! Just write the 6-bit

// volume to the i2c bus. That's it!

boolean setvolume(int8_t v) {

// cant be higher than 63 or lower than 0

if (v > 63) v = 63;

if (v < 0) v = 0;

Serial.print("Setting volume to ");

Serial.println(v);

Wire.beginTransmission(MAX9744_I2CADDR);

Wire.write(v);

if (Wire.endTransmission() == 0)

return true;

else

return false;

}

// Read in + and - characters to set the volume.

void loop() {

if (! Serial.available()) return;

// read a character from serial console

char c = Serial.read();

// increase

if (c == '+') {

thevol++;

}

// decrease

else if (c == '-') {

thevol--;

}

// ignore anything else

else

return;