Tag: CR1220
![ATtiny85 Ring Watch ATtiny85 Ring Watch](https://www.electronics-lab.com/wp-content/uploads/2016/02/FUWFMUQIKFQ06NI.MEDIUM.jpg)
Arduino
ATtiny85 Ring Watch
This is a great ATtiny85 watch that uses a SSD1306 OLED display and is powered by a CR1220 battery. Today core subject, ATtiny85. Someone suggest me to use SOIC version to reduce the watch size and I found the coin cell mAh calculation method will count the battery voltage down to...
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