ADC — A/D Converter input interface

This module enables reading analog input values from the analog to digital converter (ADC) on the TI AM3358 SoC on the BeagleBone.

Example:

import Adafruit_BBIO.ADC as ADC

ADC.setup()

# The read method returns normalized values from 0 to 1.0
value = ADC.read("P9_40")

# The read_raw returns non-normalized values from 0 to 4095
value = ADC.read_raw("P9_40")

Adafruit_BBIO.ADC.setup_adc()

Setup and start the ADC hardware.

Adafruit_BBIO.ADC.setup_read(channel)

Read the normalized analog value for the channel.

Parameters:channel (str) – GPIO channel to read the value from (e.g. “P8_16”). Returns:normalized value reading from 0.0 to 1.0 Return type:float

Adafruit_BBIO.ADC.setup_read_raw(channel)

Read the raw analog value for the channel.

Note:Kernels older than 4.1.x returned a raw value range 0 - 1800 based on the reference voltage of 1.8 V. Parameters:channel (str) – GPIO channel to read the value from (e.g. “P8_16”). Returns:raw value reading from 0 to 4095 (12 bits). Return type:float