Sergey Kiselev designed this I2S Audio pHAT:
This is a Raspberry Pi Zero pHAT form-factor I2S audio interface board based on a Cirrus Logic (Wolfson) WM8731 audio codec. It provides line input, line output, headphones output, and includes an on-board microphone.
If you’ve enjoyed Guillermo Amaral’s electronics projects such as the Canon DSLR WiFi Remote, Raspberry Pi PSU, UARTMatic 3000+, Keypad Submodule and many more, then please consider giving to his cancer treatment fund:
I’ve unfortunately had to flip the bill for my two past surgeries and my on going cancer treatment… and as you can imagine, I’m running out of cash.
If you like my content and/or have found my published projects interesting or useful, please consider sending me some spare change and I’ll be ever so grateful.
Here are couple great project videos by Guillermo on YouTube:
James Lewis designed this AVR based power controller for the Raspberry Pi that can safely shutdown the Pi:
The total circuit includes an AVR microcontroller, a near-zero current LDO, and a switching (buck) supply. My current design draws about 350nA when Vin is 9V. The AVR controls power to the Raspberry Pi. Two GPIO pins are used. One for the AVR to initiate a shutdown and one for Raspberry Pi to tell AVR after filesystem has been unmounted.
The design files and source are shared on GitHub:
From tomtibbetts on Hackaday.io:
Mini ATX PSU allows you to power the Raspberry Pi using an
inexpensive desktop power supply. It also does controlled shutdown of
Myles Eftos designed this IR-Blaster add-on board for Raspberry Pi that supports HDMI CEC:
The design files and source code are available on GitHub: