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[Lcdproc] I2C interface with keypad and HD44780


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  • From: azizth AT gmail.com (Aziz THRAYA)
  • Subject: [Lcdproc] I2C interface with keypad and HD44780
  • Date: Mon Apr 21 06:41:01 2008

Hello,

I found this very simple circuit to add keypad with I2C interface for
HD44780 :



<http://alpmp3.sourceforge.net/images/fox_i2c.png>
http://alpmp3.sourceforge.net/images/fox_i2c.png



It use 2 PCF8574 (one for HD44780 and one for Keypad), But I need your help
to modify the driver to read the 2 addresses for the 2 PCF.

This circuit control 20*2 HD44780 but we can modify it with I2C circuit in
LCDPROC documentation to control HD44780 20*4 display.

Can you help me ?

Best Regard THRAYA Aziz



Hello,

I found this very simple circuit to add keypad with I2C interface for HD44780 :

 

http://alpmp3.sourceforge.net/images/fox_i2c.png

 

It use 2 PCF8574 (one for HD44780 and one for Keypad), But I need your help to modify the driver to read the 2 addresses for the 2 PCF.

This circuit control 20*2 HD44780 but we can modify it with I2C circuit in LCDPROC documentation to control HD44780 20*4 display.

Can you help me ?

Best Regard THRAYA Aziz

 



  • [Lcdproc] I2C interface with keypad and HD44780, Aziz THRAYA, 04/21/2008

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