Ultrasonic & Distance SensorsCompatible
HC-SR04 Ultrasonic Distance Sensor
Non-contact ultrasonic distance sensor measuring 2 cm to 4 m. The standard sensor for obstacle-avoiding robots, parking sensors, water-tank level meters and school projects.
- Operating Voltage
- 5 V DC
- Working Current
- 15 mA
- Frequency
- 40 kHz
- Measuring Range
- 2 cm – 400 cm
- Resolution
- About 3 mm
- Measuring Angle
- 15°
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Specifications
- Manufacturer Part Number
- HC-SR04
- Operating Voltage
- 5 V DC
- Working Current
- 15 mA
- Frequency
- 40 kHz
- Measuring Range
- 2 cm – 400 cm
- Resolution
- About 3 mm
- Measuring Angle
- 15°
- Trigger Input
- 10 µs TTL pulse
- Pins
- VCC, Trig, Echo, GND
- Size
- 45 × 20 × 15 mm
Description
The HC-SR04 sends a burst of 40 kHz sound and times the echo – the longer the echo takes, the farther the object. It needs just two I/O pins and works with Arduino, ESP32 and Raspberry Pi.
Features
- Measuring range 2 cm to 400 cm, resolution about 3 mm
- Measuring angle about 15°
- 5 V supply, about 15 mA working current
- 4 pins: VCC, Trig, Echo, GND
How it works
Pull Trig HIGH for 10 µs. The module then raises Echo for as long as the sound takes to go out and back. Distance in cm = echo time in µs ÷ 58. On 3.3 V boards (ESP32, Raspberry Pi) put a voltage divider (e.g. 1 kΩ + 2 kΩ) on the Echo line.
Package includes
1 × HC-SR04 ultrasonic sensor