Solved.
Output current of PCF8575 is not enough to drive ULN2803, so I had to add 2.2K pull-up resistors, and now it works just fine.
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Re: PCF8575 Does not work with my code....
Solved.
Output current of PCF8575 is not enough to drive ULN2803, so I had to add 2.2K pull-up resistors, and now it works just fine.
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