In this guide we will create a simple knob sketcher toy using a graphical display and two potentiometers, also known as trim pots or just pots. We'll go over the basic idea of drawing a pixel to the display as well as how to use the pots to generate a variable voltage. The two concepts will be put together to create a couple different variations of a knob sketcher toy.
This guide uses an Adafruit ItsyBitsy M4 Express as the main board. However, you could adapt this to other boards that run CircuitPython and have the available pins. You might need to change the example code to match the pins for your board.
The other key part for this project is a graphical display. This guide uses the two displays below, but you could also substitute for other similar displays as long as there is a CircuitPython driver available.
You'll need a pair of potentiometers also. The two options used in this guide are linked below. Pots are also pretty common things, so any similar ones would likely work.
In addition, you'll need a breadboard and some hookup wires. A button is used for the second knob sketcher. Details are provided later in the guide.