Serial One Pin LCD Module by 89C2051

There years ago, I am working on several design related to a tiny but powerful MCU 89C2051.

Interface a 16x2 character LCD module by 89C2051 and programed by BASCOM 8051.

89C2051 as the LCD Module interface controller so that I can use only one pin to put ALL LCD module command to the LCD Module. I think this idea is great and start to make:

• Serial One Pin LCD Module with several options
• Serial One Pin keyboard matrix reading
• Serial One Pin I/O expander
• Serial One Pin 4-digit LED display (7-segement Read LED unit)

Even I build them as Kit and sell in eBay until I have no time to manage them!