LCD 3 wires

Posted on Feb 6, 2014

This post is based on the work made previously by tomek in wiring LCD displays using 4 bits. The basic idea is to group the 7 pins that are needed to drive the LCD in only 3 using a shift register. This is a cheap alternative to serial LCDs. The schematic shows that wiring the LCD is a simple operation. It has been drawn in a way that makes it pos

LCD 3 wires
Click here to download the full size of the above Circuit.

sible to develop this as part of a single sided PCB including a variable resistor to control the LCD`s contrast. Note that the pin-out of the LCD module may differ slightly from the pin-out depicted; some LCD modules have pins 15 and 16 on the left side, before pin 1. As part of the Arduino Miniconf at linux. conf. au 2012, freetronics released the pebble v2 with identical Shift Register wiring than this page, and Attendee Marc MERLIN wrote a NewLiquidCrystal driver for this hardware: This driver should work for all LCD3Wires based hardware, and was based on the excellent work from Francisco Malpartida who modified the original LiquidCrystal library to provide support for different hardware drivers. His work is available here:. This is the work Marc based his driver on to provide full LiquidCrystal support to LCD3Wires hardware by writing LiquidCrystal_SR_LCD3. cpp. Below is the original code originally written to talk to this hardware setup. It does not work out of the box with arduino 1. 0, and the library is much less featureful than LiquidCrystal. It is left here for historical purposes. Also available is a library: Attach:LCD3WireLibrary. zip. To remain command-compatible with the LCD4BitLibrary, this library does not contain the number-formatting code which is included in the code below. To get the original version working on IDE 1. 0 you have to copy/paste WConstants. h and wiring. h from IDE 0023 into arduino-1....

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