Documentation and Python library module for interfacing a PCD8544 LCD screen to a Rasbperry Pi. Cheap Nokia 5110 modules can be picked up on ebay with a breakout board for a few pounds.
Further technical details for the LCD screen can be found in the datasheet [PDF].
Compile and install the wiringPi python bindings from https://github.com/rm-hull/wiringPi. Make sure you install both python-dev and libi2c-dev. This library specifically requires the python binding baked into this software, which have not been pushed back to drogon.
Next, install PIL (Python Imaging Library) as follows:
$ sudo apt-get install zlibc libpng3 libfreetype6 libfreetype6-dev python-pip $ sudo pip install pillow
After having cloned from github:
$ python setup.py clean build $ sudo python setup.py install
This should install the files in your local dist-files ares (somewhere like
Next, test at the hardware and software is working:
$ cd examples $ sudo ./alphabet_text.py
Most of the ASCII character set should be displayed. There are a few other examples of graphics rendering in the same directory.
There appears to be different pin-out configurations on PCD8544 modules – beware!
Although the python library (currently) used software-base bit-banging to do the SPI chattering, the pins chosen should be compatible with hardware SPI. The above diagram was modified for my wiring setup from an SVG from http://shiro.be/ – all rights of the original author reserved.
With 4 push-buttons, resistor values 10K.
Buttons (from top to bottom) are wired onto BCM pins as follows:
- GPIO 14 (TxD)
- GPIO 17
- GPIO 25
- GPIO 22
- More examples
- Introduce small/tiny font handling onto drawable PIL surfaces
- Implement module for scanning push buttons
- Hardware SPI rather than software emulation