Electronic Dice Circuit

Figure 1 

The circuit is designed to produce a dice that can be operated electronically and digitally just like the function of a normal dice.

• 4011 – a quad 2-input NAND gate integrated circuit, generally characterized by small fluctuation in voltage supply, very high impedance, outputs that can sink and source, one output can drive up to 50 inputs, high speed gate propagation time, high frequency, and low power consumption
• 4017 – a decade counter where the count advances as the clock input becomes high that may be combined with diodes for some functions such as flash sequences

The circuit resembles the main functions of a normal dice which makes it significant in generating numbers by chance from 1 to 6. The indication is shown on the LEDs D1 to D6 which also correspond to the dice numbers 1-6, once the push button switch S1 is pushed and left running. The movement of the light on LED matches the dice movement. Once the LED turns ON, it will remain ON for ten seconds and will eventually fade afterwards, then wait for the next movement. In order to replicate the real dice, the light needs to stop in one of the six LEDs that will turn ON, since each LED is a representation of one side of a dice. After releasing the press on S1, the LEDs turn ON in sequence where one will remain ON.

Segregating the circuit into two parts can be possible where one is responsible for the indication while the other provides the control and the timing. The last part of the circuit is performing an astable operation from IC1a-c, and monostable operation from IC1B-D. The counter IC2 with ten outputs is being driven by the line of pulses in sequence, from the unstable circuit. The electronic dice circuit only requires 6 which can be done by connecting the pin 5 output to the input of reset pin 15. The high value of pin 5 restores the counter to its initial state. The HIGH outputs of IC2 are the ones powering the LEDs which turns ON when the cathode and R6 are LOW, since they are connected in common point. The connection of R6 and IC1D is always HIGH that causes all LED to be OFF. The input of S1 to IC1B will take a LOW level in a short time interval, which transmits and forces the gate to be LOW. The current that passes to the LED is limited by R6. The circuit can be supplied by a battery source since it does not consume much energy.

Figure 2 

The Electronic dice can ideally take part in role playing games and any kind of board games like Dungeons and Dragons, Yahtzee, Monopoly, Axis & Allies, Craps, and Boggle where random choices in music and art creation can be made. I can also be used to pick any number or be used in a heads or tails manner. Using this circuit will prevent cheating and no rolling off the table.

Source:users.otenet.gr/~athsam/electronic_dice_a.htm