How to Use JSN-SR20-Y1: Examples, Pinouts, and Specs

The JSN-SR20-Y1 is an ultrasonic distance sensor manufactured by JSN. It operates by emitting ultrasonic sound waves and measuring the time it takes for the sound waves to bounce back after hitting an object. This sensor is capable of measuring distances ranging from 20 cm to 600 cm with high accuracy, making it ideal for applications such as:

• Robotics and automation
• Obstacle detection in autonomous vehicles
• Distance measurement in industrial systems
• Smart parking systems
• Liquid level detection

Its robust design and waterproof casing make it suitable for both indoor and outdoor environments.

The JSN-SR20-Y1 has a 4-pin interface for easy integration into circuits. The pinout is as follows:

1. Power the Sensor: Connect the VCC pin to a 5V DC power source and the GND pin to ground.
2. Trigger the Sensor: Send a 10 µs HIGH pulse to the TRIG pin to initiate a measurement.
3. Read the Echo: Measure the duration of the HIGH signal on the ECHO pin. This duration corresponds to the time taken for the ultrasonic pulse to travel to the object and back.
4. Calculate Distance: Use the formula below to calculate the distance: [ \text{Distance (cm)} = \frac{\text{Time (µs)} \times 0.034}{2} ] The factor 0.034 accounts for the speed of sound in air (340 m/s).

• Ensure the sensor is mounted securely and aligned properly for accurate measurements.
• Avoid placing the sensor near sources of ultrasonic noise or vibrations.
• Use a capacitor (e.g., 10 µF) across the power supply pins to reduce noise.
• For outdoor use, ensure the sensor is protected from extreme environmental conditions despite its waterproof design.

Below is an example of how to use the JSN-SR20-Y1 with an Arduino UNO:

// Define pins for the JSN-SR20-Y1 sensor
const int trigPin = 9;  // TRIG pin connected to digital pin 9
const int echoPin = 10; // ECHO pin connected to digital pin 10

void setup() {
  pinMode(trigPin, OUTPUT); // Set TRIG pin as output
  pinMode(echoPin, INPUT);  // Set ECHO pin as input
  Serial.begin(9600);       // Initialize serial communication
}

void loop() {
  // Send a 10 µs HIGH pulse to the TRIG pin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Measure the duration of the HIGH signal on the ECHO pin
  long duration = pulseIn(echoPin, HIGH);

  // Calculate the distance in cm
  float distance = (duration * 0.034) / 2;

  // Print the distance to the Serial Monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  delay(500); // Wait for 500 ms before the next measurement
}

1. No Output or Incorrect Readings

   • Cause: Improper wiring or loose connections.
   • Solution: Double-check all connections, ensuring the VCC and GND pins are properly connected.

2. Fluctuating Distance Measurements

   • Cause: Electrical noise or interference.
   • Solution: Add a decoupling capacitor (e.g., 10 µF) across the power supply pins to stabilize the voltage.

3. Sensor Not Detecting Objects

   • Cause: Object is outside the sensor's range or has a poor reflective surface.
   • Solution: Ensure the object is within the 20 cm to 600 cm range and has a surface that reflects sound waves effectively.

4. Sensor Fails in Outdoor Conditions

   • Cause: Extreme environmental conditions or water ingress.
   • Solution: Verify the sensor's waterproof casing is intact and avoid exposing it to temperatures beyond its operating range.

Q1: Can the JSN-SR20-Y1 measure distances below 20 cm?
A1: No, the sensor's minimum range is 20 cm. Objects closer than this may result in inaccurate readings.

Q2: Is the sensor compatible with 3.3V microcontrollers?
A2: The JSN-SR20-Y1 requires a 5V power supply. However, logic level shifters can be used to interface it with 3.3V microcontrollers.

Q3: Can the sensor detect transparent objects?
A3: Ultrasonic sensors may struggle with transparent or very thin objects as they do not reflect sound waves effectively.

Q4: How can I improve measurement accuracy?
A4: Use the sensor in a stable environment, avoid obstacles in the ultrasonic path, and ensure proper alignment.

This concludes the documentation for the JSN-SR20-Y1 ultrasonic distance sensor.