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7-segment LCD expansion board for EFM8BB1
This project was designed as a proof of concept for controlling a segment LCD display through bit-banging on a low-cost, and low-pin MCU. The concept for this was introduced by this TI appnote: http://www.ti.com/lit/an/slaa654a/slaa654a.pdf
The LCD used in this project is a 4-digit, 4-mux display, PN: LCD-S401M16KR from Lumex. This LCD has 4 mux lines and 8 segment lines, for the control of up to 24 segments (7 segment digit x 4, plus colon and three dots).
The schematic and board layout files for this expansion board are provided in the attached zip file. Also included is a project for the EFM8BB1 STK that samples the voltage from the joystick and displays this voltage on the LCD.