![]() I reverse engineered the PCB and have provided a copy of the circuit above should you wish to make your own from scratch. The serial I2C conversion to LCD parallel is achieved through the use of a conversion module purchased from Ebay as detailed in the aforementioned Instructable which is based around the PCF8574 IO Expander. It's been fully tested without any issues up to a maximum of 4 LCDs of varying dimensions as in the attached picture above. It's my first go at writing a C++ Arduino Library so apologies if it's not in 100% perfect Arduino 'speak'. ![]() 'Microchip PIC Library to Control a 20 by 4 LCD over I2C' This project is a comprehensive Arduino port of an earlier Instructable which can be found here
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