PCF8574 I2C to GPIO interface IC to 4x4 matrix keypad and access the 16 keys for different purposes
History
PCF8574 interface IC (I2C to GPIO) to 4x4 matrix keypad
2015-05-20, by aslam [Wed, 20 May 2015 10:34:30 +0000] rev 0
PCF8574 interface IC (I2C to GPIO) to 4x4 matrix keypad