I built an AI Tamagotchi before Meta could

The author built a DIY AI device using a Waveshare ESP32-S3 1.75C pendant, which is similar to Meta's Muse Charm, and has a similar price point of $50. The DIY device has features such as a 1.75-inch touchscreen, a pocket watch design, and can control smart home devices, but it has limitations such as slow responses and limited functionality. The author notes that the DIY device is officially sanctioned by Meta and uses Meta's open-source code and tokens to connect to its Muse AI cloud. The author believes the DIY device was a worthwhile learning experience, despite its limitations.