An electronic dice project circuit can be designed in various modes , using logic circuit or using microcontrollers . This electronic project is based on the PIC16C54 microcontroller , manufactured by Microchip . This project is a simple dual electronic dice project , that use few external electronic parts and LED displays , to generate ( simulate ) dices .
As you can see in the schematic circuit , the main advantage of this electronic dice project is that this circuit require few external electronic parts ( like many of the microcontroller based projects ) .
The circuit needs to be powered from a 5 volts DC power supply circuit , but you can use a 9 volts battery and a 5 volt three terminal regulator ( connected like in this circuit diagram ) .
There are two I/O ports in the 16C54; one 8 bit & the other 4 bit. The 8 bit port, Port B, is connected to the 7 segment display. Three pins of the 4 bit Port A are used and the other pin is tied high. Pin 4 of the PIC is also tied high to give a power-on reset.
A 150R resistor acts as a current limiting resistor for each display. PIC ports have a maximum sourcing current of 40mA ( the maximum current for the LED display is 200mA so it is the PIC that R1 is protecting, not the display.)
The PIC uses its internal RC clock oscillator option (with the 10K resistor, R3, and the 330pF capacitor, C2) and runs at about 330kHz. The switch is connected to input RA0. Normally this line is pulled high via R4 to +5V, but when the switch is closed the input is pulled low. The software detects the falling edge as a dice roll.
You can download souce code for this electronic project following this link Pic16c54 dual dice project source code