Its an old alarm and I want to add internet and GSM connectivity to it without paying the outrageous UK prices. I created the library as part of a project to build a bus pirate for my Scantronic 9800 house alarm. It is provided free to use in what ever way you see fit (just make a mention of me), though it comes unsupported. ![]() I have included the source code and MPLABX project to get you up and running quickly. To use the source and create the microcontroller circuitry you will need to be reasonably au fait with Microchip microcontrollers, the 'C' programming language and electronics in general. In this case the PIC18F2685 running at 4MHz. ![]() The LCD is configured for 4 bit interfacing and can be written to and read from via the microcontroller. This Instructable presents a 'C' library for controlling a single 20 by 4 LCD based on the HD44780 LCD controller over I2C using the NXP PCF8574 Remote 8bit IO Expander.
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