PC Interface Demo Board

PC Interface Demo Board
PC Interface Demo BoardPC Interface LED - Demo PC Interface Demo ProgramsPC-Based Automation
5 5 5 Product


With this electronic board you can control any device from your PC. You can also receive or send data to any sensor. One temperature sensor included on board.

Just connect the PC - Interface demo board to the RS-232 port of your PC, connect any device you wish to control and run the demo software. Demo programs and demo source code (in Visual Basic) are provided for free. Based on demos, you can develop your own software in any programming language. 

This board was mainly designed for developing PC- based automation applications. However, it can be used as a general purpose PIC development board. Given the source code, replacing the PIC16F877 with another pin - compatible PIC requires only some minor firmware modifications.  

Author: G. Adamidis

Creative Commons License
PC Interface Demo Board by G. Adamidis is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.

Board Features

1 x PIC 16F877 Microcontroller

1 x RS-232 port

3 x DPDT relays

1 x Analog Temperature Sensor

1 x Digital Output Port (8bits)

1 x Digital Input port (8bits)

1 x Analog Input port (0-5V / ADC resolution: 10bit)

1 x Potentiometer (connected to 10-bit A/D, analog input channel) to be used as an angular position sensor 

1 x 8-LED Bar

1 x 7-segment Arithmetic LED Display

1 x connection for MPLAB PICkit 3 or ICD 3 in-circuit programming and debugging 

Electronic schematics and PCB details

Electronic schematic - Sheet 1 of 4 /  Main circuit

Electronic schematic - Sheet 2 of 4 /  Power supply section 

Electronic schematic - Sheet 3 of 4 /  Relays section 

Electronic schematic - Sheet 4 of 4 /  RS-232 interface section 

PCB Artwork

Components placement guide


Demo Programs and Source Code

PC Interface Demo Board Firmware in HEX (use it to program the PIC Microcontroller)

PC Interface Demo Board Firmware in C

Thermometer Demo - (Windows Program + V.B code)

Thermostat Demo - (Windows Program + V.B code)

Voltometer Demo - (Windows Program + V.B code)

IO Demo / Digital Input & Output - (Windows Program + V.B code)

LED Flasher Demo - (Windows Program + V.B code)

Weekly Programmer Demo - (Windows Program + V.B code) 

Download PC demo programs and V.B source code

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