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The product is intended for specialists and requires qualified and authorized personnel. The product does not include assembly/use instructions . Putting the product into operation by unqualified persons leads to the loss of the warranty according to the Terms and Conditions on the site.
The specified technical parameters (current, power, etc.) represent maximum allowable values under ideal operating conditions. For safe use and optimal lifespan, it is recommended to operate the product continuously at no more than 50% of the specified maximum values.
Ultrasonic sensor module, JSN-SR04T, v3.3, waterproof, 3-5V
Waterproof ultrasonic module for non-contact distance measurement, ideal for automation, level monitoring and object detection in wet or dusty environments. It operates at 3-5V, offers stable measurement between 21 and 500 cm with fine resolution, has temperature compensation and improved filtering for better accuracy. Easily compatible with Arduino, ESP32, STM32 via TRIG and ECHO.
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JSN-SR04T V3.3 is an ultrasonic module for contactless distance measurement, designed for industrial applications, automation, level monitoring, object detection, and microcontroller projects. Version V3.3 brings significant improvements such as temperature compensation for increased accuracy, filtering of same-frequency interference for a cleaner and more stable signal, optimization of interference generated by the flyback DCDC source, and the possibility to adjust the measurement angle for different scenarios.
The product is equipped with an integrated, sealed, and waterproof ultrasonic probe, making it suitable for wet or challenging environments. The module offers stable measurement, low power consumption, compact size, and good compatibility with most microcontrollers on the market. The detection range is approximately 21 to 500 cm, with 1 mm resolution and high accuracy when used correctly.
From the factory, the module is set to Mode 0, which means pulse width output, and in this mode it is used very similarly to a classic HC-SR04. A pulse is sent on the TRIG pin, and the duration of the returned pulse is read on the ECHO pin. Distance is calculated in the same way, making integration very simple in Arduino, ESP32, STM32, or other embedded platform projects. The main difference from a classic HC-SR04 is that this model is waterproof, has a larger minimum measurement zone of about 20-21 cm, and can also operate in UART or switch modes.
It is a very good choice for liquid level measurement applications, smart systems, presence detection, industrial automation, robotics, and monitoring in humid or dusty spaces.
Specifications:
Power supply voltage: DC 3.0-5.5 V
Operating current: <8 mA
Probe frequency: 40 kHz
Measurement range: 21-500 cm
Minimum distance: 20 cm
Maximum distance: 500 cm
Accuracy at long distance: ±1 cm
Declared accuracy for version V3.3: up to 3 mm under certain conditions
Resolution: 1 mm
Measurement angle: 75 degrees
Trigger signal: TTL pulse over 10 us or serial command 0x55
Output signal: pulse width, TTL, UART, or switch output depending on mode
Connections: VCC, TRIG/RX, ECHO/TX, GND
Operating temperature: -20°C to +70°C
Probe type: integrated, sealed, waterproof
Module dimensions: 42 x 29 x 12 mm
Operating modes:
Jumpers are made directly on the board, in the area marked M1 / M2 / M3, by closing the contact between the common pad and the desired mode pad. The MODE jumper is soldered to set the M1, M2, and M3 modes which have 47K, 120K, and 470K resistors inserted on the PCB. For example, for M2, the MODE jumper and M2 jumper are soldered.
| Mode | Mode selection | Output | Notes |
|---|---|---|---|
| Mode 0 | Mode floating | Pulse width output | Default factory mode, similar to HC-SR04 |
| Mode 1 | M1 short or 47K | UART automatic output | Automatic periodic transmission on TX |
| Mode 2 | M2 short or 120K | UART controlled output | Triggered by 0x55 command on RX |
| Mode 3 | M3 short or 470K | Switch output | Digital output based on preset threshold |
Connection:
| Module Pin | Connection | Role in Mode 0 | Role in UART modes |
|---|---|---|---|
| VCC | 3.0-5.5 V | Module power supply | Module power supply |
| GND | GND | Common ground | Common ground |
| TRIG / RX | Digital output pin from microcontroller | Receives trigger pulse of minimum 10 us | Receives serial data or 0x55 command in Mode 2 |
| ECHO / TX | Digital input pin to microcontroller | Sends ECHO pulse proportional to distance | Sends serial data with measured distance |
| MODE | Common mode selection pad | Left open for Mode 0 | Connected by jumper to M1, M2, or M3 to select mode |
| M1 | Selection pad | Not used in Mode 0 | MODE-M1 jumper for automatic UART |
| M2 | Selection pad | Not used in Mode 0 | MODE-M2 jumper for controlled UART |
| M3 | Selection pad | Not used in Mode 0 | MODE-M3 jumper for switch output |
Usage:
The module is used for contactless distance measurement in automation applications, liquid level monitoring, object detection, robotics, and embedded systems. In the factory configuration, the sensor operates in Mode 0 with pulse width output, similar to a classic HC-SR04. It is powered at 3.0-5.5 V, a pulse of at least 10 us is applied on the TRIG pin, and the duration of the returned pulse is read on the ECHO pin, proportional to the measured distance. Distance calculation can be done with the formula time (us) / 58 = cm. For stable measurements, an interval greater than 60 ms between two consecutive readings is recommended.
The selection of operating modes is done directly on the PCB, in the area marked MODE, M1, M2, and M3. For the default Mode 0, the MODE pad remains open. For the other modes, a solder jumper is made between the common MODE pad and the desired mode pad. Thus, MODE-M1 activates automatic UART output, MODE-M2 activates controlled UART output, and MODE-M3 activates switch output mode. The board also has series resistors for mode selection, with M1 corresponding to 47K, M2 to 120K, and M3 to 470K. Only one mode can be selected at a time.
In automatic UART mode, the sensor measures periodically and automatically transmits the distance value on the TX pin. In controlled UART mode, each measurement is initiated by sending the 0x55 command on the RX pin, and the result is subsequently sent on TX. In switch mode, the ECHO output changes state depending on the preset threshold, useful for simple presence or proximity detection. To control a relay, an external transistor stage is necessary since the output does not have direct driving capability.
For correct results, the sensor must be mounted stably, properly oriented towards the measurement surface, and used outside the minimum zone of approximately 20-21 cm. The waterproof design and improved interference filtering make the module suitable for wet or challenging environments.
Arduino Example:
Test code in the adjacent section.
| JSN-SR04T V3.3 Module Pin | Arduino Uno Pin | Role |
|---|---|---|
| VCC | 5V | Module power supply |
| GND | GND | Common ground |
| TRIG | D9 | Measurement trigger |
| ECHO | D8 | ECHO pulse reading |
| MODE | open | No jumper in factory mode |
| M1 | open | Not connected |
| M2 | open | Not connected |
| M3 | open | Not connected |
Produs destinat utilizarii in proiecte electronice, automatizari, prototipare, educatie si cercetare.
Produsul trebuie utilizat numai conform specificatiilor tehnice mentionate in descriere si/sau in documentatia produsului.
Avertismente generale de siguranta:
Nu utilizati produsul la tensiuni, curenti sau temperaturi peste valorile specificate.
Montajul si conectarea trebuie realizate de persoane cu cunostinte tehnice minime in domeniul electric/electronic.
Evitati scurtcircuitele, inversarea polaritatii si conectarea gresita a alimentarii.
Nu lasati produsul alimentat nesupravegheat in timpul testelor.
Produsul nu este jucarie si nu este destinat copiilor.
Pentru modulele electronice, se recomanda utilizarea in carcase, panouri sau montaje protejate, dupa caz.
Identificare produs:
Denumirea produsului, codul/SKU-ul si caracteristicile tehnice sunt mentionate in pagina produsului si/sau pe eticheta ambalajului.
Producator / Importator / Distribuitor:
Sigmanortec S.R.L.
Calea Bucuresti nr. 9, Targu Jiu, Gorj, Romania
E-mail: [email protected]
Website: www.sigmanortec.ro
Persoana responsabila in UE:
Sigmanortec S.R.L.
Calea Bucuresti nr. 9, Targu Jiu, Gorj, Romania
E-mail: [email protected]
Documentatie si siguranta:
Pentru informatii suplimentare, fise tehnice, declaratii de conformitate sau instructiuni, ne puteti contacta la [email protected].
#define TRIG_PIN 9
#define ECHO_PIN 8
void setup() {
Serial.begin(9600);
pinMode(TRIG_PIN, OUTPUT);
pinMode(ECHO_PIN, INPUT);
digitalWrite(TRIG_PIN, LOW);
}
void loop() {
long duration;
float distanceCm;
// Send trigger pulse
digitalWrite(TRIG_PIN, LOW);
delayMicroseconds(5);
digitalWrite(TRIG_PIN, HIGH);
delayMicroseconds(20);
digitalWrite(TRIG_PIN, LOW);
// Read echo pulse
duration = pulseIn(ECHO_PIN, HIGH, 40000);
// Check if no echo was received
if (duration == 0) {
Serial.println("Out of range or no echo");
} else {
distanceCm = duration / 58.0;
Serial.print("Distance: ");
Serial.print(distanceCm);
Serial.println(" cm");
}
delay(100);
}
