3 wire LCD display

Normally driving an LCD requires seven connections to pins on the display, but by using a shift register, [Phillip Warner] at Arduino Playground was able to drive an LCD using only 3 wires. The method is cheaper than a serial LCD, but you’ll mainly save yourself a lot of effort and time by using it.

[Warner] used a HEF4094 chip to group the lines together and a variable resistor to control the contrast. A zip file with the requisite code to make this work can be found in the post.

[via YourITronics]


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