DLD Project Write Up

Mini Project: Rolling Heads or Tails Machine

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Name of Mini Project

Rolling Heads or Tails Machine using Decade Counter

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Block Diagram

[ Power Supply ] ⇒ [ Decade Counter IC ] ⇒ [ LEDs (Alternating States) ] ⇒ [ User Touch Input ]

# Mini Project: Rolling Heads or Tails Machine  
 
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### **Name of Mini Project**  
Rolling Heads or Tails Machine using Decade Counter  
 
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### **Block Diagram**  
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[ Power Supply ] --> [ Decade Counter IC ] --> [ LEDs (Alternating States) ] --> [ User Touch Input ]

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Circuit Diagram

[Provide a simple circuit diagram showing the decade counter IC connections, LEDs, and input/output connections.]

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Components Required

1. Breadboard
2. Decade Counter IC (e.g., 4017 IC)
3. LEDs (Red and Yellow)
4. Resistors (330 Ohm or appropriate for LEDs)
5. Jumper Wires
6. 9V Battery and Connector

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Working

The Rolling Heads or Tails Machine is designed to simulate a coin-tossing mechanism using a decade counter IC and LEDs.

1. The decade counter is powered by a 9V battery.
2. LEDs are connected to the output pins of the counter. The LEDs alternate in their “on” state as the counter progresses through its outputs.
3. The counter continuously cycles through the outputs, creating a rolling effect between the LEDs.
4. When the user touches two wires to supply voltage, the counter halts, leaving one of the LEDs lit, which represents the result (“Heads” or “Tails”).

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Advantages

1. Simple and easy to implement with minimal components.
2. Provides a visual representation of a coin toss.
3. Useful for random selection or decision-making.

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Limitations

1. Relies on physical user input to stop the counter, which may introduce a small delay.
2. Limited to two outputs, making it a basic decision-making tool.

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Applications

1. Random decision-making or game applications.
2. Teaching tool for understanding decade counters and basic electronics.
3. Can be modified for educational purposes, such as a binary counter demonstration.

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Implementation Screenshots and Photos

Breadboard Setup:

Video/Screen Recording with Explanation

• Include a video or screen recording explaining the working mechanism, components, and functionality of the project.

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Overall Cost/Budget

Component	Quantity	Cost per Unit (INR)	Total Cost (INR)
Breadboard	1	150	150
Decade Counter IC	1	20	20
LEDs	2	5	10
Resistors (330 Ohm)	2	2	4
Jumper Wires	10	1	10
9V Battery & Connector	1	50	50
Total Cost	-	-	244 INR

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References

1. Datasheet of Decade Counter IC 4017
2. Tutorials on Breadboard Circuit Design

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