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Topic: My most beloved topic - the PCF8574 with a HD44780 (Read 3 times) previous topic - next topic

aleale99


thanks for the code Angelito,
only one question: the pin assignments for pcf8574 is equal to the original (MCP23008)?

*
;Connect the following pins from MCP23008 to LCD
;
;P0 - D4
;P1 - D5
;P2 - D6
;P3 - D7
;P4 - RS
;P5 - RW (not used, set to 0 to ground for write)
;P6 - Bl (backlight switch)
;P7 - E
*/

Mario_H

#26
Mar 23, 2010, 11:08 pm Last Edit: Mar 23, 2010, 11:08 pm by Mario_H Reason: 1
Nachtwind,

Perhaps this can be of help.
http://www.xs4all.nl/~hmario/arduino/LiquidCrystal_I2C/

Cheers,

Mario

aleale99

thanks Mario

I use your lib, works fine with my lcd modules

Ale


linux-works

has anyone found that the philips (nxp) and TI versions are NOT compatible??  I cannot get the -a version from both places to work.

the NXP works fine.  uses the -a style addressing (0111xxx).  but the TI chip will not work!  others have reported this but I have not found any answers ;(

anyone??


linux-works

replying to my own post ;)

I found the problem.  see this:

http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1233786313/3#3

THAT solved it.

next time anyone runs into this, try the pullup trick.

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