Using the Pin Change Interrupt allows connecting encoders and buttons to any of the Arduino pins, not just the two External Interrupt enabled pins. While maintaining the ability of immediate reaction ...
The LED display is based on the TM1637 chip, which does all the heavy lifting, and makes it easy to connect. On my LED display, the pins are labelled CLK, DIO, VCC, GND. Wire the VCC pin to 5V on the ...
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