Materials and Components:
- Speed Sensor (Hall Effect Sensor or Magnetic Pickup)
- Microcontroller (e.g., Arduino)
- Display Module (LCD or LED)
- Potentiometer (for calibration)
- Voltage Regulator
- Capacitors and Resistors
- Enclosure or Dashboard Mounting Bracket
Mechanical Setup:
1. Mounting the Speed Sensor:
- Install the speed sensor near the vehicle's wheel.
- Ensure proper alignment to capture wheel rotations accurately.
2. Connecting the Sensor:
- Connect the sensor's wires to the appropriate pins on the microcontroller.
- Typically, there will be three wires: power, ground, and signal output.
Electronic Circuit:
3. Wiring the Circuit:
- Follow a circuit diagram to connect the sensor, microcontroller, display module, potentiometer, and power source.
4. Power Supply:
- Use a voltage regulator to provide a stable power supply to the circuit.
Programming the Microcontroller:
5. Microcontroller Programming:
- Write a program that reads the signal from the speed sensor, processes it, calculates speed, and displays the result on the display module.
- Use appropriate libraries to handle interrupts, display management, and calculations.
6. Calibration:
- Use the potentiometer to calibrate the speedometer.
- Adjust the settings until the speedometer readings match with the actual speed of the vehicle.
Final Assembly:
7. Mounting the Speedometer:
- Install the speedometer or integrate it into the vehicle's dashboard.
8. Testing and Adjustments:
- Test the speedometer by driving the vehicle at different speeds and observe the accuracy of readings.
- Make any necessary adjustments to improve accuracy.
Remember, building a functional speedometer requires expertise in electronics and accurate calibration to ensure reliable speed measurements. It's recommended to consult with experienced individuals or seek professional guidance if you're not familiar with these technical aspects.
