Citizen over at the 430h forum has been working on a smart coaster project that blinks and buzzes your drink status:
He’s trying to cram the following features into his design.
- TI TMP006 for contactless temperature sensing.
- Self powered design.
- TI BQ25504 for energy harvesting via tiny solar cells.
- A tiny buzzer for audible notifications
- A bi-color LED for visual indications
- Capacitive buttons to set the desired temperature for cold and hot drinks.