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arduino uno pcf8574p i2c

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kunal123

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hi guys,
i refere following tutorial for i2c interface
http://garagelab.com/profiles/blogs/tutorial arduino uno r3 i/o port expander with PCF8574P

i want to use PCF8574P, i write data 0 (in binary 00000000) in it & try to receive data from it but i receive data is in decimal 11111111

i think PCF8574P not responding

thanks & regards
 

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