This charming PCB keychain is ingeniously designed in the shape of a unicorn, complete with Blinky blue LEDs for added effect. The LEDs are driven by an ATTiny412 microcontroller and powered by a CR2…
This charming PCB keychain is ingeniously designed in the shape of a unicorn, complete with Blinky blue LEDs for added effect. The LEDs are driven by an ATTiny412 microcontroller and powered by a CR2032 coin cell battery. A set of 100-ohm current limiting resistors ensure the longevity of the LEDs while maintaining optimal brightness. The keychain also features a UPDI programming header, allowing for firmware updates and customizations, adding a practical edge to its playful design. A convenient switch integrated into the design allows for turning keychain ON and OFF, making it both a fun and functional accessory.
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