Electronic Dice Circuit

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An electronic dice is a classic first project for those getting interested in electronics. A timer, counter and a few LEDs makes a circuit that can also add a new twist to some old boring board games. When the switch is pressed, a 555 timer in astable mode pulses a BCD counter which lights up a series of LEDs wired to mimic a dice. Two AND gates are used to reset the count back to one whenever the BCD output is seven. Thus, the circuit is not truly random but the natural bounce present in a pushbutton and the normal human ability to operate much slower then the oscillator make the output of the circuit seem random.

Schematic

Parts

Part	Total Qty.	Description	Substitutions
R1, R5, R6	3	22K 1/4W Resistor
R2	1	10K 1/4W Resistor
R3	1	4.7K 1/4W Resistor
R4	1	150K 1/4W Resistor
R7 - R13	7	330 Ohm 1/4W Resistor
C1	1	1uF Electrolytic Capacitor
C2	1	4.7uF Electrolytic Capacitor
D1	1	1N4148 Signal Diode
D2 - D8	7	Red/Green/Yellow LED
Q1	1	2N3904 NPN Transistor
U1	1	555 Timer IC
U2	1	74LS192 4 Bit Counter IC
U3	1	74LS08 Quad Intengreted AND Gate IC
S1	1	SPST Momentary Pushbutton Switch
MISC	1	Board, Wire, Sockets For ICs, Case

Notes

Pushing and holding S1 causes the LEDs to rapidly cycle. Releasing the button locks the pattern and shows a number from 1 to 6.

When building the circuit, make sure to position the LEDs as shown on the schematic. Otherwise the pattern of the dice will look weird.

Two circuits can of course be both powered by one switch to make a dual dice.

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Comments

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anonymous Electronic Dice Thursday, March 09, 2017 12:01:24 PM

r u stupid kid theres 7 LED's because you arrange them like the face of a die to make the numbers appear like they do on the face of a die

anonymous Electronic Dice Tuesday, February 16, 2016 2:39:56 PM

why 7 led's for 6 numbers?

anonymous Electronic Dice Saturday, April 13, 2013 6:01:17 AM

Wow I just constructed this circuit in tina circuit Simulator and it works perfect

John Electronic Dice Thursday, March 10, 2011 11:31:02 AM

I believe that the pin 7 on IC LS192 that is pulled to VCC should be left open and pin 15 should be set to VCC instead. Please note that pin 7 is an output and that Pin 15 is the least significant input digit.

anonymous Electronic Dice Friday, November 19, 2010 4:30:58 AM

Dice is plural, if you've only got one of them it's a die.Anyone heard the expression "The die is cast" ?

Aries1470 Electronic Dice Tuesday, October 26, 2010 11:39:23 PM

Dear Anonymous of Monday, May 03, 2010. Is that a question. Well, if you look at the diagram, it says he is using 5v, so any capacitor of 6v an more is adequate. Just make sure you have a regulated 5v power supply. for anonymous saturday, september 26, 2009. Obviously not enough! I have bought them many times over on eBay, nice and safely using paypal! yes, it is that easy. You register with paypal, using either your bank account (dependant on country) or a credit / debit card. Simple.

waltz Electronic Dice Monday, October 18, 2010 10:58:10 PM

HELP!!! i have done this circuit, but only output number 1,2,3,6... the 4 and 5 is missing...

anonymous Electronic Dice Monday, May 03, 2010 1:52:02 PM

How many volts are the capacitors?

princerence. Electronic Dice Wednesday, January 06, 2010 11:28:48 PM

i think and gate is 74ls08.

anonymous Electronic Dice Saturday, September 26, 2009 2:23:14 PM

Where can I buy the 4 bit counter and the AND gate IC's? I have looked everywhere!

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anonymous	Electronic Dice	Thursday, March 09, 2017 12:01:24 PM
r u stupid kid theres 7 LED's because you arrange them like the face of a die to make the numbers appear like they do on the face of a die
anonymous	Electronic Dice	Tuesday, February 16, 2016 2:39:56 PM
why 7 led's for 6 numbers?
anonymous	Electronic Dice	Saturday, April 13, 2013 6:01:17 AM
Wow I just constructed this circuit in tina circuit Simulator and it works perfect
John	Electronic Dice	Thursday, March 10, 2011 11:31:02 AM
I believe that the pin 7 on IC LS192 that is pulled to VCC should be left open and pin 15 should be set to VCC instead. Please note that pin 7 is an output and that Pin 15 is the least significant input digit.
anonymous	Electronic Dice	Friday, November 19, 2010 4:30:58 AM
Dice is plural, if you've only got one of them it's a die.Anyone heard the expression "The die is cast" ?
Aries1470	Electronic Dice	Tuesday, October 26, 2010 11:39:23 PM
Dear Anonymous of Monday, May 03, 2010. Is that a question. Well, if you look at the diagram, it says he is using 5v, so any capacitor of 6v an more is adequate. Just make sure you have a regulated 5v power supply. for anonymous saturday, september 26, 2009. Obviously not enough! I have bought them many times over on eBay, nice and safely using paypal! yes, it is that easy. You register with paypal, using either your bank account (dependant on country) or a credit / debit card. Simple.
waltz	Electronic Dice	Monday, October 18, 2010 10:58:10 PM
HELP!!! i have done this circuit, but only output number 1,2,3,6... the 4 and 5 is missing...
anonymous	Electronic Dice	Monday, May 03, 2010 1:52:02 PM
How many volts are the capacitors?
princerence.	Electronic Dice	Wednesday, January 06, 2010 11:28:48 PM
i think and gate is 74ls08.
anonymous	Electronic Dice	Saturday, September 26, 2009 2:23:14 PM
Where can I buy the 4 bit counter and the AND gate IC's? I have looked everywhere!