Unbiased Electronic Dice with LEDs

It is good idea to put this circuit in a box and mark/write each LED with number 1 to 6. Now, when switch S1 is pushed momentarily, any one of the 6 LEDs will glow. The Number marked for glowing LED becomes dice's output. Every time S1 is released, new LED will glow randomly. Chances for each LED to glow is 16.66%.This circuit makes use of two ICs, IC555 and IC-CD4017. IC-555 is used as square wave generator, and IC(CD4017) as a counter. Actually CD4017 is a divide-by-10 johnson-counter with 10 decoded outputs. CD4017, and the clock frequency is controlled by R1 and C1. Counter CD4017 starts counting from 0 to 9 by putting high voltage on each of the 10 pins (one after another). The High voltage shifts from one pin to another on every positive edge of the clock. We all love to play with it too. Playing with dice needs us to pick up a dice and make sure that it is unbiased. Making a block as a dice and cutting it clearly to make sure that it is unbiased is all an old story. The dice becomes biased if the shape is not cut well. Also, the dice can become biased due to deformations. If it is a wooden die, it can deform due to dampness in the atmosphere or due to mechanical stress. There is no chance to cheat as the circuit operates at such a high speed that the circuit is almost imperceptible to the human eye. There is also little maintenance and there is hardly any impact on aging of the circuit. This circuit can be implemented on a general purpose PCB with a 9V DC power supply. ICs, a few transistors and a handful of LEDs. IC1a & IC1b operate as an oscillator with a frequency of about 4kHz and this clocks IC2. The frequency of oscillation is not critical - it simply needs to be high enough to prevent cheating. IC2 and IC3 are 4516 binary counters, configured to count in binary from 1-6. A power-on reset is not required here since, if the initial state is outside the correct range, the counters will count into the correct range after a few clock pulses. Let's first consider how IC2 operates. When the counter reaches "7" (ie, 111), the AND gate formed by diodes D1 & D2 and the 47kO resistor applies a high to the PE pin (pin 1).This presets the counter to 1 (ie, 001) and so PE goes low again. The counter then increments in the normal manner until it reaches "7" again. Counter IC3 operates in the same manner except that the clock signal is derived from IC2's O3 output. Normally, the counters are incrementing continuously and the LEDs all appear to be lit. However, when push-button switch S1 is pressed, pin 6 of IC1c goes low and pin 9 of IC1d pulls the Ci input of IC2 high, thus stopping the counters. We all love to play with it too. Playing with dice needs us to pick up a dice and make sure that it is unbiased. Making a block as a dice and cutting it clearly to make sure that it is unbiased is all an old story. The dice becomes biased if the shape is not cut well. Also, the dice can become biased due to deformations. If it is a wooden die, it can deform due to dampness in the atmosphere or due to mechanical stress. There is no chance to cheat as the circuit operates at such a high speed that the circuit is almost imperceptible to the human eye. There is also little maintenance and there is hardly any impact on aging of the circuit. This circuit can be implemented on a general purpose PCB with a 9V DC power supply. KHz for the 4017 counter which contains ten outputs (Q0 to Q9). Each output becomes high when the clock pulses are received by them. As only six outputs (Q0-Q5) are needed so Q6 is connected to reset. The charge (q) stored in a capacitor is the product of its capacitance (C) value and the voltage (V) applied to it. Capacitors offer infinite reactance to zero frequency so they are used for blocking DC components or bypassing the AC signals. LED with number 1 to 6. Now, when switch S1 is pushed momentarily, any one of the 6 LEDs will glow. The Number marked for glowing LED becomes dice's output. Every time S1 is released, new LED will glow randomly. Chances for each LED to glow is 16.66%.This circuit makes use of two ICs, IC555 and IC-CD4017. IC-555 is used as square wave generator, and IC(CD4017) as a counter. Actually CD4017 is a divide-by-10 johnson-counter with 10 decoded outputs. CD4017, and the clock frequency is controlled by R1 and C1. Counter CD4017 starts counting from 0 to 9 by putting high voltage on each of the 10 pins (one after another). The High voltage shifts from one pin to another on every positive edge of the clock. I presented a model for many applications. Let’s see some toy circuits. This is an electronic dice circuits. Which looks like a real dice. We use only the press switch being thrown. Although this is the high-tech toys. Such as, Game PC, Tablet so expensive. But this projects an enchanting are: To start creating your own. Make family time together creatively. Then, taking output at pin 7 to reset pin 15 as soon as pin 7 has output in a fraction of a second. But can also use supply voltage between +3V to +15V, by still work normally. I tried on my own at pin 12,14,and 16 respectively but the circuit only works when I connected the switch to pin 16. However the leds light up in sequence not in random,and the leds should light up rapidly when the switch is pressed but they didnt. 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. IC LS192 that is pulled to VCC should be left open and pin 15 should be set to VCC instead. Well, if you look at the diagram, it says he is using 5v, so any capacitor of 6v an more is adequate. This is done mainly to prevent spam and other abuse. If you wish to remain anonymous, simply enter "anonymous" for your name and/or email. The counter increments by one in its natural count sequence each time it is clocked.

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