Potentiometer

Description

A potentiometer is a resistor that can be mechanically changed. Typically form factors are knobs (turn to change) or sliders. The change of resistance is either linear (resistance changes linear with the angle or distance) or logarithmic.

Potentiometer

Slider

How to connect it electrically

How to control it in MicroPython

1 #ESP32 or ESP8266
2 from machine import Pin, ADC
3 from time import sleep
4 pot = ADC(Pin(34))
5 pot.atten(ADC.ATTN_11DB)
6 while True:
7   pot_value = pot.read()
8   print(pot_value)
9   sleep(0.5)

1 #Raspberry Pi Pico
2 from machine import Pin, ADC
3 from time import sleep
4 pot = ADC(Pin(26))
5 conversion_factor = 3.3 / (65535)
6 while True:
7   pot_value = pot.read_u16() * conversion_factor
8   print(pot_value)
9   sleep(0.5)

Here the voltage of Pin 34 (for the ESP) or on Pin GP26 (for the Pico) is manipulable with the poti:

Schematic drawing: