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Full Version: Lesson19- how to use PCF8574 IIC extend GPIO for ESP32 multi relay
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Arduino IDE source code: 
[attachment=330]
had to change variables pins_in arduino.h (as suggested in video) for SDA =4 and SCL=5 from original values.

everything works great.

video upload of kc868-a8 relays performing would not work.

couple of pictures to suffice.
Do I have to made some adjustments for use this for the kc868-a6 board?
i don't understand what's your question? do you have issue with KC868-A6 ? or KC868-A8?
(12-28-2024, 01:18 AM)admin Wrote: [ -> ]i don't understand what's your question? do you have issue with KC868-A6 ? or KC868-A8?

Good afternoon, if you notice that the question is being asked about 868-A6 by a completely different person... And the question is, do I need to change anything in the Arduino.h library compared to the 868-A8 board?
need define i2c bus pin define.