The circuit is really simple, perfect for beginners. It’s a good idea to do a dry-run of the circuit assembly first to test everything works before assembly on the rocket. You only need to connect 3 alligator clips:
- Red goes to Vout
- Black goes to Gnd
- White goes to A7
For a permanent installation, a USB cable and 5V supply are fine.
If you’re using a battery pack or LiPo battery, plug it into the black JST connector of the Circuit Playground Express, opposite the microUSB connector. If you need more advice on what battery to choose, check out this guide.
For a kid-friendly and mobile option, the 3xAA battery pack would be great.
If you'd like to permanently mount the project with wall power, this supply may work well.