Are you want to create a 3 wire interface for LCD display, but you don’t want to burn too much of money buying the expensive electronic components? If you answered yes, then this post is what you’ve looking for.

Firstly, we’re using the 4 bits in wiring LCD display. Therefore, we must try to group the 7 pins, which are essential to drive the LCD in only 3 pins, by using a shift register. This method is considered the cheaper and efficient way to serial LCD’s.

Below is the schematic for the 3 wires interface. If you’re referred to the schematic properly, you will find out that is completely a well drawn schematic. This also means it is possible to develop as a single sided PCB.

What you saw in the above figure, is the actual connections on a breadboard. All of the power was runs out from the USB powered board constantly. The pinout for the LCD displays has been standardized.

Hopefully, you will enjoy this project, and you also can download the code for this project here. [source]

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