The Keyestudio 3PCS HC-SR04 Ultrasonic Sensor Distance Measuring Module is a popular non-contact distance detection sensor designed for Arduino UNO, robot car obstacle avoidance, and smart robotics projects. Using ultrasonic wave technology operating at 40kHz, it accurately measures object distances from 2cm to 400cm with ±3mm precision.
Typical applications
- Robot car obstacle avoidance and autonomous path planning
- Distance measurement and proximity detection systems
- Smart robotics and autonomous vehicle projects
- Arduino learning projects and STEM classroom experiments
- Automatic parking assist and level detection systems
- Motion and object detection for security or home automation
- Industrial fill-level sensing and conveyor gap monitoring
- Serial monitor replacement for real-time distance readout in standalone builds
Specifications
| Part number | Keyestudio HC-SR04 (3-Pack) |
| Brand | Keyestudio |
| Sensor type | Ultrasonic distance sensor |
| Operating voltage | 5V DC |
| Measuring range | 2cm – 400cm |
| Measuring angle | 15° |
| Working frequency | 40kHz |
| Accuracy | ±3mm |
| Interface | 4-pin: VCC, Trig, Echo, GND |
| Measurement method | Non-contact ultrasonic ranging |
| Mounting | PCB mount |
| Pack quantity | 3 modules per pack |
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