UP Board has any ADC Pin

Whee Min

Hi UP Creators,
Can I verify if there is any ADC pin in the 40 pinout( Pin 7)? Can you provide more developmental information if it is available. Example, is there any example code so that developers can know how to use it.

Thanks ,
Whee Min

Javier Arteaga

Hi tanwm,

There is indeed an 8-bit ADC available on pin 7. It operates on the 0V to 3.3V range. On supported versions of Linux, digital values can be read directly through sysfs:

/sys/bus/iio/devices/iio\:device0/in_voltage_raw
/sys/bus/iio/devices/iio\:device0/in_voltage_scale

We'll be updating the documentation shortly with more detail.

Michael Oravecz

See the CPLD and ADC blocks in the updated diagram of the UP-Board on page 2 of the latest datasheet:
http://www.up-board.org/wp-content/uploads/2015/09/UPDatasheetV8.4.pdf
The pinout for the UP Board is also shown on page 2. The ADC is indeed indicated on pin 7.
GPIO2/ADC-input7

Mario

Hello
With respect to the ADC pin. Can it be read with the mraa library?
ex: self._analog=mraa.Aio(7) in python

Best regards,
Mario

Dan O'Donovan

Hi Mario

The short answer is: "not yet".

However, if you want it quickly and are happy to build MRAA from source code, you might be interested in this pull request:
https://github.com/intel-iot-devkit/mraa/pull/608

Best regards,
-Dan