This Roulette Wheel of Fortune Circuit help us make fun game like small roulette wheel of luck!; and when game start ten lights blink all in random way.
Also, lights keep changing until only one light stays ON and that one is a winner!
Hence, we never know which light stay ON so thee is always surprise when we play.
Circuit Working:
Parts List:
| Components | Quantity |
|---|---|
| Resistors | |
| 120Ω 1/4 watt | 1 |
| 330Ω 1/4 watt | 1 |
| 1k 1/4 watt | 1 |
| Capacitors | |
| Electrolytic 4.7μF 25V | 1 |
| Semiconductors | |
| IC 7413 | 1 |
| IC 7493 | 1 |
| IC 7445 | 1 |
| LEDs 5mm 20mA | 10 |
| Push to off switch | 1 |
The above circuit is easy to build and works as a ten-sided die wheel of fortune, which people use in many kinds of games.
Hence, when press switch S1 pin 1 of IC 7413 goes high and then game start spinning and this make wave pulse and turn ON oscillator inside IC 7413 which move pin 14.
Also, pin 14 is part of IC2 a 4-bit counter; but when we stop pressing S1 the spinning stop.
So IC2 use fast oscillator to count how many pulse happen when S1 is open and this helps stop cheating; also decimal converter IC3 and BCD take 4-bit data from IC2.
Here, one LED turn ON to show which of IC3s 10 output is low but only when counter DCBA is less than 1001; for example: if DCBA = 0110 then output 6 is low and D7 lights up.
Also, the IC 7445 uses only 10 out of 16 steps and the players turn ends when DCBA changes between 1010 and 1111.
Then all outputs goes high and no LED turn ON and if we use decoder like 74154 of 24 pin with some resistors and 6 LEDs then the game can have 16 outcomes.
Hence, with small changes we can make 16 side die wheel of fortune.
Formula:
IC 7413 is chip with two NAND gates with each gate has 4 input, also NAND gate work with logic and it gives output like this:
Output = NOT (A AND B AND C AND D)
Here, A, B, C and D are input bits and each bit can be either 0 or 1.
NOT means opposite If 0 goes in then 1 come out, if 1 goes in then 0 come out; that means all inputs must be 1 for output to be 1.
More information about IC 7413:
Truth Table:
This table show what output come for every input combo like 0000, 0001, etc, also each gate in chip have truth table.
Can find this table in datasheet or online.
Pin Configuration:
IC have 14 pins and some pins for input which are pin 1 to 8 and some for output which are pin 3, 6, 11, 14.
Other pins for power are VCC and GND and datasheet show pin layout for correct wiring.
Working Details:
Datasheet also tell voltage range which shows how much current it uses and delay time for how fast output change after input.
Note:
IC 7413 work with NAND logic and to use it we need to know how to connect input and get output properly.
How to Build:
To build a Roulette Wheel of Fortune Circuit below steps are important to follow:
- First, put ICs on the PCB board and connect PCB positive side to power and also to make pulse connect oscillator parts to IC 7413.
- After that, connect pin 14 of IC2 to output of oscillator and put switch S1 in the circuit.
- Next, when we press switch, then pin 1 of IC 7413 goes high and start the oscillation, but when game is running IC2 count pulse like counter.
- Also, connect IC2 output to BCD input of IC3 and IC2 give BCD output and IC3 convert BCD to decimal number.
- Then connect LEDs to IC3 output and each LED for one number and use IC 7445 to decode decimal output.
- After that, connect LEDs to IC 7445 output and check LED light up correct for each number.
- Also, be sure oscillator is fast so player can not guess or stop at number they want.
- Use logic to check when player turn is finish based on conditions.
- Press switch and test circuit and watch LED lights and see if result is random.
Finish and Protect:
- Also, if all work fine, then fix all wire good and ensure no loose connection happen later.
Conclusion:
This Roulette Wheel of Fortune Circuit is good for electronic games, school learning tools and fun systems with luck or chance.
Also, it work like electric version of spinning wheel which are same like used in roulette or wheel of fortune.
When working with electronic circuits always look at datasheets for each part and also think about safety and be careful.
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