//DIGITAL_READ(2, A4, 4); //Not avaliable on Arduino Uno, i2c pin. //DIGITAL_READ(2, A5, 8); //Not avaliable on Arduino Uno, i2c pin.
Hi, I've been using the ArduinoPortExpander with esphome to control mostly relays, digital outputs (to LEDs and buzzers, etc) and for some binary sensors. I'm using a wemos d1 mini and an Arduino Uno ...
A while ago I received a couple of I/O port expander modules that use the I 2 C protocol. Using that Chinese module, you can use only the SDA and SCL pins of your Arduino, or any microcontroller ...
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