Tag: CR1220

ATtiny85 Ring Watch
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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