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I2C witch PCF8574P (keypad 4x4)

Question asked by siqueira.erisson on Mar 20, 2013
Latest reply on Mar 20, 2013 by siqueira.erisson
Hi,

I would like to control keypad through PCF8574, but some problems
are occurring like (reading only one time), and receiving 'ack' even disabled.
"http://www.nxp.com/documents/data_sheet/PCF8574.pdf"
(see de picture below)

FX266.gif

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