[Lcdproc] I2C interface with keypad and HD44780
Aziz THRAYA
azizth@gmail.com
Mon Apr 21 06:41:01 2008
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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
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<p class=3DMsoPlainText><span lang=3DEN-US>Hello,<o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US>I found this very simple =
circuit to add
keypad with I2C interface for HD44780 :<o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoPlainText><a =
href=3D"http://alpmp3.sourceforge.net/images/fox_i2c.png"><span
lang=3DEN-US>http://alpmp3.sourceforge.net/images/fox_i2c.png</span></a><=
span
lang=3DEN-US><o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US>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.<o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US>This circuit control 20*2 =
HD44780 but we
can modify it with I2C circuit in LCDPROC documentation to control =
HD44780 20*4
display.<o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US>Can you help me ? =
<o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US>Best Regard THRAYA =
Aziz<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><o:p> </o:p></span></p>
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