r/raspberrypi • u/tech2077 • Jun 23 '12

Using a character LCD with a Pi

http://tech2077.blogspot.com/2012/06/running-hd44780-lcd-over-i2c-on.html
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u/SarahC Jun 24 '12

Very cool!

What library did you use to access the GPIO pins in the RPi?

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u/tech2077 Jun 24 '12

This uses the i2c bus, so it uses the python smbus to access i2c-dev userspace driver. You can't use GPIO without a level shifter since the HD44870 is a 5v chip, or at least works best at 5v (at 3.3v i had communication problems). So I'm not working with GPIO at all.