Schematic Diagram and Parts List
Block Diagram: This is a updated PC board, the crystal and
2 capacitors are no longer needed.
Printed circuit board layout
Lcd Display 16 characters x 2 line display (Hitachi/Sharp/Optrex...)
Standard 14 pin module or equivalent;
16C84 or 16F84 (Pre-programmed) with Hex file (See below);
4x4 Keypad (or 16 switches arranged in matrix configuration);
2 Normally OFF push-button (Emergency Stop and Menu Selection);
4 - 2.2k 1/4 or 1/8 watt resistors (Value not critical - 1k to 6.8k acceptable);
8 - 1k 1/8 watt resistors (Keyboard Matrix);
5k to 10k trimmer pot (LCD display contrast);
4 mHz Crystal or Ceramic Resonator;
2- 22pf capacitors;
Plastic case, connectors, etc...
The following parts are available:
Pre-programmed 16F628 micro-controller - $15.00US
4x4 Matrix keyboard (as shown on the main page) - $ 5.00US
Dual-sided plated-through-holes printed circuit board - $11.00 US
All prices in US $ (or equivalent) and include postage and handling.
To order or request further information e-mail Robert Cote
or Johnny Zajdler.
Derosoft (Denise Baribeau/Robert Côté - Pointe-Claire, Qc. Canada - NMRA Member #115144) June 1998
DCC Logo by Gary Smith - PCB designed by Johnny Zajdler.