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;
To Next Page
Loading...