S-Tek, Inc. - Designed PIC16F876A based I2C interface board. The single chip, interface board operated a 16-character, x 2-line LCD module, status LED, and enabled 256 bytes of EEPROM R/W, flash memory storage, in the PIC. The interface to the motherboard was accomplished via an I2C connection. The PIC16F876A had a custom address to allow many other standard I2C components to be used on the same bus. Firmware allowed I2C codes to be sent that would write either function or CGRAM data, to the LCD module. The PIC wrote to the LCD module using a 7-line (3-control, 4-high/low nibble) interface. An adjustable contrast voltage pot was included to enhance the display contrast under varying temperature ...
