Description
Features
Here’s a list of some of the HC-SR04 ultrasonic sensor features and specs:
- Power Supply :+5V DC
- Quiescent Current : <2mA
- Working Current: 15mA
- Effectual Angle: <15°
- Ranging Distance : 2cm – 400 cm/1″ – 13ft
- Resolution : 0.3 cm
- Measuring Angle: 30 degree
- Trigger Input Pulse width: 10uS
- Dimension: 45mm x 20mm x 15mm
How Does it Work?
The ultrasonic sensor uses sonar to determine the distance to an object. Here’s what happens:
- The transmitter (trig pin) sends a signal: a high-frequency sound.
- When the signal finds an object, it is reflected and…
- … the transmitter (echo pin) receives it.






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