Then, you set up the analog pin by creating an analogio.AnalogIn() object,
providing it the desired pin using the board module, and saving it to the variable
analog_pin .
Finally, in the loop, you print out the analog value with analog_pin.value , including
a time.sleep() to slow down the values to a human-readable rate.
Reading Analog Voltage Values
These values don't necessarily equate to anything obvious. You can get an idea of the
rotation of the potentiometer based on where in the range the value falls, but not
without doing some math. Remember, you wired up the potentiometer as a voltage
divider. By adding a simple function to your code, you can get a more human-
readable value from the potentiometer.
You'll need to connect to the serial console() to see the values printed out.
In the example below, click the Download Project Bundle button below to download
the necessary libraries and the code.py file in a zip file. Extract the contents of the zip
file, open the directory Adafruit_ESP32-S3_TFT_Feather/analogin/ and then click on
the directory that matches the version of CircuitPython you're using and copy the
contents of that directory to your CIRCUITPY drive.
Your CIRCUITPY drive should now look similar to the following image:
# SPDX-FileCopyrightText: 2022 Kattni Rembor for Adafruit Industries
# SPDX-License-Identifier: MIT
"""
CircuitPython analog voltage value example
"""
import time
import board
import analogio
analog_pin = analogio.AnalogIn(board.A0)
def get_voltage(pin):
return (pin.value * 3.1) / 61000
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