SparkFun Forums

[harshcht]

I was trying to use the sx1509 with esp-32. I make the connections according to I2C and then upload the analogWrite example. However, the innitialiation function

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io.begin

does not work (i.e the expander is not innitialised). I checked in the .cpp file of the library. The

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if (testRegisters == 0xFF00)

statement returns false.

Note: the board works perfectly with arduino MEGA.

Can anyone please help me solve the issue (or at least give a hint of what the problem could be).