Voltage ranges

Moved to learn.bela.io/using-bela/about-bela/bela-hardware/#voltage-levels

Absolute maximum ratings:

• Audio input: 3.3Vpp
• Analog input: 0V to 5V
• Digital input/output: 0V to 3.3V

Real-world voltages and their digital counterparts in Bela:

• audio input input range is 1.8Vpp when the PGA is 0dB. This maps to values between -1 and 1 when using audioRead().
• the headphone out is 2.6Vpp AC coupled when the heapdhone out level is set to 0dB. This maps to value between -1 and 1 when using audioWrite().
• the hot(+) signal at the line output (unpopulated pads on J9) is 1.8Vpp DC coupled with a DC offset of 1.3V. So audioWrite(context, n, ch, 1) gives 2.2V, audioWrite(context, n, ch, 0) gives 1.3V, audioWrite(context, n, ch, -1) gives 0.4V.
• the analog inputs have a range of 0V to 4.096V. This maps to values between 0 and 1 when using analogRead()
• the analog outputs have a range of 0V to 5V. This maps to values between 0 and 1 when using analogWrite()
• the digital outputs have a range of 0 to 3.3V. using digitalWrite(context, n, ch, 0) you will get 0V, when using digitalWrite(context, n, ch, 1) you will get 3.3V.