I use a simple serial connection to tell the Due what to output into an analog output pin. However, the outputs are offset about 550mV (as seen on an oscilloscope) and the maximum value of 255 gives ~2.7V. What am I missing? Why can't the DAC output 0V - 3.3V mapped onto 0 - 255 values?
int output = DAC1; // analog output pin
String inData;
void setup()
{
Serial.begin(9600);
}
void loop() {
while (Serial.available() > 0) {
char value = Serial.read();
inData += value;
if(value == '\n'){
val = inData.toInt(); // 0..255
analogWrite(output, val);
Serial.println(val);
inData = "";
}
}
}
