| Pin | Name | Function |
|---|---|---|
| 1 | VCC | Power supply (5V) |
| 2 | TRIG | Trigger input (send a 10µs pulse to start measurement) |
| 3 | ECHO | Echo output (pulse width = distance) |
| 4 | GND | Ground |
Summary
Ultrasonic distance sensor — sends a sound pulse and times the echo to measure distance. Cheap, simple, and one of the most common beginner sensors for obstacle detection or parking-sensor style projects.
- Interface: Digital (Trigger + Echo pulses)
- Supply voltage: 5V
- Range: 2cm - 400cm
- Measuring angle: ~15°