TheBackShed.com

Home	JAQForum Ver 24.01
Log In or Join
Active Topics
Local Time 12:41 08 Jun 2025	Privacy Policy
Jump to

Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me.

Forum Index : Microcontroller and PC projects : PCF8574 I2C LCD

Author

Message

jman

Guru

Joined: 12/06/2011
Location: New Zealand
Posts: 711

Posted: 06:20am 28 Mar 2012

Copy link to clipboard

Print this post

Hi

So in the current trend of I/O saving I decided to buy one of these PCF8574
8 bit I2C I/O boards from Ebay Ebay PCF8574

This simple code flash's a LED connected to any of the I/O pins

I2caddr = &h20 ' PCF8574 I2C address
I2CEN 100,100 ' Enable I2C

Test:
I2CSEND i2caddr, 0, 1, &B00000000
Pause 500

I2CSEND i2caddr, 0, 1, &B11111111
pause 500
GoTo Test

A real good use for this device is to drive a Character LCD
like this

Many thanks to http://letsmakerobots.com/node/4240
for the PixAxe code

Code attached
2012-03-28_161915_I2CLCD.zip Edited by jman 2012-03-29

Print this page

To reply to this topic, you need to log in.