Product description: Ultrasonic distance sensor JSN-SR04T-V3.3 20-450 cm with waterproof probe
A waterproof ultrasonic sensor operating in a range from 20 cm to 450 cm. Powered by a voltage of 3.0 V to 5.5 V DC , the output is a signal whose duration is proportional to the measured distance. The sensor is compatible with the popular HC-SR04 sensor , meaning that the sample programs and libraries will work correctly for both sensors.
We invite you to read the guide , which includes a sample service program. ultrasonic sensors with Arduino. |
The sensor has four pins compatible with the HC-SR04 module : VCC - supply voltage from 3.0 to 5.5 V DC, GND - system ground and Echo and Trig signal pins. JSN-SR04T-V3.3 Ultrasonic Distance Sensor Specifications
- Supply voltage: 3.0 V to 5.5 V DC
- Average current consumption: 8 mA
- Measuring range: from 21 cm to 600 cm
- Output: frequency signal
- Operating frequency: 40 kHz
- Measuring angle: below 75°
- Operating temperature: -20°C to 70°C
- Includes a waterproof probe with a 2.5 m cable
- Module dimensions: 41.3 x 34.3 x 12 mm
Product compatible with Arduino and Raspberry Pi |
How to use
To start the measurement, apply a voltage pulse (5V high) to the TRIG pin for 10 us. The module measures the distance using a 40 kHz sound wave. A signal is sent to the microcontroller, where the distance depends on the duration of the high state and can be calculated using the following formula:
test distance = (high level time × velocity of sound (340m/s) / 2
Where:
- test distance - measured distance
- high level time - duration of the high state
- velocity of sound - the speed of propagation of a sound wave in the air - 340 m/s
In short, to obtain the result in cm you can use the formula:
distance [cm] = ( high level time [us] * 34 ) / 1000 / 2
The measurement procedure is shown in the figure.
How is the JSN-SR04T sensor constructed?
The JSN-SR04T sensor can be used as an accessory for robots, toys, measurement systems, and other electronic and mechanical devices. On a small PCB, There is an ultrasonic transmitter and receiver. An ultrasonic wave, originating from the on-board generator output, is sent from the sensor and reflected back from the object being measured. The distance between the sensor and the obstacle is calculated based on the time between sending and receiving the ultrasonic wave from the sensor.
Cooperation of the JSN-SR04T sensor with single-chip computers
The JSN-SR04T sensor is specifically designed for use with embedded systems, including popular single-chip minicomputers. Measurements are accurate to within 3 mm, sufficient for both hobbyist applications and prototypes of professional measurement devices. The SN-SR04T sensor outputs a +5 V signal, compliant with the TTL and Arduino standards. For the sensor to work with the Raspberry Pi, a voltage level converter is required to convert the TTL level to 3.3 V.
