IR Sensor vs Ultrasonic Sensor: Which One to Use?
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Distance measurement is a common requirement in embedded systems. Two widely used sensors are IR (Infrared) sensors and ultrasonic sensors. Each has different characteristics and is suitable for specific applications.
Working Principle
IR Sensor
- Uses infrared light reflection
- Detects object based on reflected signal
Ultrasonic Sensor
- Uses sound waves
- Measures distance based on echo time
Comparison
| Feature | IR Sensor | Ultrasonic |
|---|---|---|
| Range | Short | Medium |
| Accuracy | Medium | High |
| Affected by Light | Yes | No |
| Affected by Surface | Yes | Yes |
| Cost | Low | Low–Medium |
When to Use IR
- Short distance detection
- Line follower robot
- Object presence detection
When to Use Ultrasonic
- Distance measurement
- Obstacle detection
- Level monitoring
IR sensors are suitable for simple and short-range detection, while ultrasonic sensors provide better accuracy and longer range for distance measurement.
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