How to Use sensor ultrasonik US-026: Examples, Pinouts, and Specs

The US-026 is an ultrasonic distance sensor designed to measure the distance to an object using sound waves. It emits ultrasonic pulses and calculates the time it takes for the echo to return, enabling accurate distance measurements. This sensor is widely used in robotics, automation, and IoT applications for tasks such as obstacle detection, distance measurement, and object tracking.

• Obstacle detection in robotics
• Distance measurement in automation systems
• Parking assistance systems
• Liquid level measurement
• Security and proximity sensing

The US-026 sensor is a reliable and versatile component with the following key specifications:

The US-026 sensor has four pins, as described in the table below:

The US-026 sensor can operate in two modes: PWM mode and UART mode. Below are the steps to use the sensor in a circuit:

1. Wiring:

   • Connect the VCC pin to a 3.3V or 5V power supply.
   • Connect the GND pin to the ground of the circuit.
   • Connect the TRIG pin to a digital output pin of your microcontroller.
   • Connect the ECHO pin to a digital input pin of your microcontroller.

2. Triggering the Sensor:

   • Send a 10µs HIGH pulse to the TRIG pin to initiate a measurement.
   • The sensor will emit an ultrasonic pulse and set the ECHO pin HIGH for a duration proportional to the distance.

3. Calculating Distance:

   • Measure the duration of the HIGH signal on the ECHO pin.
   • Use the formula:
     [ \text{Distance (cm)} = \frac{\text{Time (µs)} \times 0.034}{2} ] where 0.034 cm/µs is the speed of sound in air.

1. Wiring:

   • Connect the VCC and GND pins as described above.
   • Connect the TX pin to the RX pin of your microcontroller.
   • Connect the RX pin to the TX pin of your microcontroller.

2. Communication:

   • Configure the UART communication at a baud rate of 9600.
   • The sensor will send distance data in a specific format (e.g., ASCII or binary).

// Define pins for the US-026 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 10µs 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 500ms before the next measurement
}

• Ensure the sensor is not obstructed by objects that could interfere with the ultrasonic waves.
• Avoid using the sensor in environments with high humidity or extreme temperatures, as this may affect accuracy.
• Use decoupling capacitors near the power supply pins to reduce noise.

1. No Output or Incorrect Readings:

   • Ensure the sensor is powered correctly (3.3V or 5V).
   • Verify the connections to the microcontroller.
   • Check for loose wires or poor soldering.

2. Inconsistent Measurements:

   • Ensure there are no obstacles near the sensor that could cause false echoes.
   • Use a stable power supply to avoid voltage fluctuations.

3. Sensor Not Responding in UART Mode:

   • Verify the baud rate is set to 9600.
   • Check the TX and RX connections between the sensor and the microcontroller.

Q: Can the US-026 measure distances less than 2cm?
A: No, the minimum measurable distance is 2cm. Objects closer than this may not be detected accurately.

Q: Can I use the US-026 with a 3.3V microcontroller?
A: Yes, the sensor supports both 3.3V and 5V operation. Ensure the logic levels are compatible.

Q: How do I switch between PWM and UART modes?
A: The mode is typically selected by configuring the sensor's pins or using specific commands. Refer to the manufacturer's datasheet for details.

Q: What is the maximum range of the US-026?
A: The maximum range is 450cm, but accuracy may decrease at longer distances.