Ultrasonic Distance Sensor Joy-IT SEN-US01 40 kHz, Range 2 cm–4 m

The Joy-IT SEN-US01 ultrasonic distance sensor operates at 40 kHz and measures distances from 2 cm up to 4 m. This compact module uses time-of-flight measurement of ultrasonic pulses to provide non-contact distance readings suitable for microcontroller and automation projects. The module outputs signals that can be read by digital or analog inputs (depending on the integration method) and is designed for applications such as robotics, obstacle detection and simple level sensing.

Advantages

The sensor offers a wide detection range from very close objects at 2 cm to larger distances up to 4 m while maintaining a compact footprint for space-constrained projects. Operating at the common 40 kHz ultrasonic frequency ensures reliable propagation in typical indoor environments. Its non-contact measurement method reduces wear and allows sensing of moving or fragile objects without physical interaction. The module is compatible with standard microcontroller platforms, enabling straightforward integration into existing circuits and code libraries.

Suitable for

• Robotics: obstacle detection and autonomous navigation
• Level sensing for liquids or bulk materials in small containers
• Proximity detection in interactive installations or security systems
• Distance feedback for automation projects and CNC/actuator control

Key specifications

• Ultrasonic frequency: 40 kHz
• Measurement range: 2 cm to 4 m
• Measurement principle: ultrasonic time-of-flight
• Detection type: non-contact distance sensing
• Typical interface: signal output compatible with microcontrollers (digital/analog depending on wiring and adapter)
• Physical: compact module size suitable for embedded use

How to use

Connect the module to a microcontroller or development board according to the module's pinout and the target platform's voltage levels. Trigger an ultrasonic pulse and measure the echo time to calculate distance using the speed of sound; many microcontroller libraries provide ready-made routines for 40 kHz sensors. Place the sensor with a clear acoustic path toward the target and avoid mounting near large reflective surfaces that could create spurious echoes. Calibrate timings or apply a correction factor if your environment has unusual temperature or humidity conditions that affect sound speed.

Usage recommendations

For best results, mount the sensor on a stable surface and ensure the transducer faces the detection area without obstructions. Allow sufficient spacing from other ultrasonic sources and reflective objects that could cause multiple echoes. When measuring liquid levels, ensure the sensor is positioned above the maximum expected surface and consider using damping or averaging in software to reduce noise from surface agitation.