This board can directly connected to the STK 500 board or the ATTiny2313 ISP program board with a 10 pole flatcable on the 10 pin header of the STK500 and the 10 pin header of the LCD/Switch board. The display has 16*2 character positions and is Hitachi HD44780 compatible, and also has a LED backlight that can be switched on/off by a jumper.

 You can puchase the ATTiny2313 board at


It uses only one port of the AVR-microcontroller. It also has five key switches. It has an contrast adjustment for the LCD module. There are several application programs for it, like a digital clock and a countdown timer and a program to write text on the display via the RS232 port.

Schematic and Layout

LCD Interface sch

LCD Interface brd