Light Theremin - The rapid switching on and off of this “astable oscillator circuit” generates sound — buzzes and tones of different frequencies.

In this project, we'll use an Adafruit Circuit Playground to light up a cheap halloween prop. This oversized skull also spews out misty cool fog using a humidifier. This DIY project doesn't require any soldering so it's very beginner friendly.

Let’s take a look at how to use the analog-to-digital converter (ADC) in an STM32 microcontroller. To make conversions happen more quickly, we can use the direct memory access (DMA) controller to pipe data directly from a peripheral (like the ADC) to memory and vice versa.