Description
Electronic DIY SMD Kit Lucky Wheel Kit Rotary Analog Lucky Turntable Assembly LED STEM Electronics Kit NE555 CD4017
Product Description
The Wheel of Fortune is a tool that first predicts where the spinning disc will stop when it stops. It can also be used for number estimation games, electronic dice, lottery machines, etc. Electronic lucky wheel achieves the same function electronically. This kit configures 10 LEDs into a circle. When the button is pressed, each LED turns light in turn. At the beginning, the flow speed is very fast. It seems that all the LEDs are flashing together. The flow speed will become slower and slower. Finally, it stops on a certain LED and stops moving. If the last LED that lights up is the same as the player predicted, then It means "winning".
Specification
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item
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value
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Supply voltage
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3.5-6V DC
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LED type
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5MM red LED
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Core chip
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NE555+CD4017
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Dimensions
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4.8*5.1cm
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Installation Instructions
Principle
The circuit is mainly composed of a pulse generator and a decimal counter circuit. The pulse generator is composed of NE555 and peripheral components to form a multivibrator. When the button S1 is pressed, Q1 is turned on, and the 3-pin of NE555 outputs a pulse, then the 10 output terminals of CD4017 output high level in turn to drive 10 LEDs to emit light in turn. After releasing the button, due to the existence of capacitor C2, Q1 will not be cut off immediately. As the voltage across C2 decreases, the conduction process of Q1 gradually weakens, and the frequency of the output pulse at pin 3 slows down. The LED moving frequency also follows. Slow down. After the discharge of C2 ends, Q1 stops outputting pulses to pin 3 of NE555, and the LED stops moving. A "lottery draw" process is thus completed. R2 determines the LED moving speed, and C2 determines the waiting time for "lottery draw" .
Use suggestions
1. The resistance cannot be soldered wrong, pay attention to the logo on the board, two are 470K, and one is 10K. 2. Pay attention to the capacitance value and positive and negative electrodes of electrolytic capacitors, one is 47uf, one is 1uf, and the positive electrode of the long leg. 3. 1N4007 should not be soldered in the opposite direction, the side with white corresponds to the side with the horizontal bar on the board. . 4. The chip cannot be inserted backwards. Note that the chip notch corresponds to the direction of the marked notch on the board. 5. LED positive and negative poles, long feet positive pole. 6. The power supply cannot be reversed, and the power supply voltage should be 3-6V DC voltage.
Details Images