i2c (PCF8574A) on Pro Mini npt working when connected to PC (CP2102)


hi,

the strangest thing. i'm tinkering i2c stuff on pcf8574a, working, when disconnect usb.

i'm using pro mini cp2102 usb programmer. i've hooked pcf8574a i2c expander i2c ports, a4 , a5 on pro mini 1k8 pull resistors. far can tell there should no conflicting ports here...

the symptom when usb programmer hooked up, seems 'hang' on wire.begin() function. not exit setup().

anyone idea's?

thx.

are on mac? cp2102 doesn't work correctly on mac, reset line not toggled in right way.


Arduino Forum > Using Arduino > LEDs and Multiplexing > i2c (PCF8574A) on Pro Mini npt working when connected to PC (CP2102)


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