B4R Question Use PCF8574 I2C Extensions as Input pin

woniol

Active Member
Licensed User
As I remember PCF8574 has an INT(errupt) output. It's state changes on every change on any of 8 PCF8574 pins set as inputs.
You can connect it to your board's input pin and do the readings according to that change on INT.

I used that chip some time ago...
 
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