This is a temperature and humidity meter based on an e-paper display like those used in Kindle e-readers. The project was a chance to learn about e-paper and play with a new microcontroller, namely the Microchip ATtiny1614, plus to try milling a PCB to accommodate an FFC connector with 0.5mm pad pitch.
It runs on a CR2032 3V coin cell which should last about 4 years. The average current draw is 5.9 uA.
The sensor is a Bosch BME280.
