-
Notifications
You must be signed in to change notification settings - Fork 139
Voltage ranges
Robert Jack edited this page Mar 23, 2021
·
9 revisions
Moved to learn.bela.io/using-bela/about-bela/bela-hardware/#voltage-levels
- Audio input/output: 3.3Vpp
- Analog input/output: 0V to 5V
- Digital input/output: 0V to 3.3V
- 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 usingdigitalWrite(context, n, ch, 1)
you will get 3.3V.