TL;DR
The MiciMike Home Mini Drop-In PCB is an open-source mainboard upgrade designed specifically for the 1st Gen Google Home Mini. This replacement board transforms the smart speaker into a fully local voice assistant that operates without relying on cloud services. It’s built on the ESP32-S3 microcontroller and features the XMOS XU316 audio processor, enabling on-device wake word detection, echo cancellation, and noise suppression using two MEMS microphones.