Arduino Unos have 2 GPIOs capable of using interrupts. This is annoying. This shield uses a 4 Parallel-In Serial-Out shift registers, some OR gates, and a 555 to allow interrupt driven control of up ...
//DIGITAL_READ(2, A4, 4); //Not avaliable on Arduino Uno, i2c pin. //DIGITAL_READ(2, A5, 8); //Not avaliable on Arduino Uno, i2c pin.
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