How to Use sensor ultrasonik: Examples, Pinouts, and Specs

The US100 Ultrasonic Sensor, manufactured by Arduino and Raspberry, is a versatile distance-measuring device that uses ultrasonic waves to determine the distance between the sensor and an object. By emitting sound waves and calculating the time it takes for the echo to return, the US100 provides accurate distance measurements in a wide range of applications.

• Obstacle detection in robotics
• Distance measurement in automation systems
• Liquid level monitoring
• Parking assistance systems
• Proximity sensing in security systems

The US100 Ultrasonic Sensor is designed for precision and ease of use. Below are its key technical details:

The US100 sensor has four pins, as described in the table below:

The US100 Ultrasonic Sensor can operate in two modes: Trigger/Echo Mode and UART Mode. Below are instructions for using the sensor in both modes.

1. Wiring:

   • Connect the VCC pin to the 5V pin of your microcontroller.
   • Connect the GND pin to the ground.
   • Connect the Trig pin to a digital output pin on your microcontroller.
   • Connect the Echo pin to a digital input pin on your microcontroller.

2. Operation:

   • Send a 10 µs 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.
   • Measure the duration of the HIGH signal on the Echo pin to calculate the distance.

3. Distance Calculation:
   Use the formula:
   [ \text{Distance (cm)} = \frac{\text{Echo Pulse Width (µs)}}{58} ]

4. Arduino Example Code:

   // Define pins for the US100 sensor
   const int trigPin = 9; // Trigger pin connected to digital pin 9
   const int echoPin = 10; // Echo pin connected to digital pin 10
   
   void setup() {
     pinMode(trigPin, OUTPUT); // Set trigger 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 trigger 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 / 58.0;
   
     // 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. Wiring:

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

2. Operation:

   • Send a command via UART to initiate a measurement.
   • The sensor will return the distance data in centimeters.

3. Arduino Example Code:

   #include <SoftwareSerial.h>
   
   // Define RX and TX pins for SoftwareSerial
   SoftwareSerial us100(10, 11); // RX = pin 10, TX = pin 11
   
   void setup() {
     Serial.begin(9600);       // Initialize Serial Monitor
     us100.begin(9600);        // Initialize US100 UART communication
   }
   
   void loop() {
     us100.write(0x55);        // Send measurement command to US100
     delay(100);               // Wait for the response
   
     if (us100.available() >= 2) { // Check if data is available
       int highByte = us100.read(); // Read high byte of distance
       int lowByte = us100.read();  // Read low byte of distance
       int distance = (highByte << 8) + lowByte; // Combine bytes
   
       Serial.print("Distance: ");
       Serial.print(distance);
       Serial.println(" cm");
     }
   
     delay(500); // Wait for 500 ms before the next measurement
   }
   

• Ensure the sensor is mounted securely and aligned properly for accurate measurements.
• Avoid placing the sensor near ultrasonic noise sources, such as motors or other ultrasonic sensors.
• Use a capacitor (e.g., 10 µF) across the VCC and GND pins to stabilize the power supply.
• When using multiple sensors, trigger them sequentially to avoid interference.

1. No Response from the Sensor

   • Solution: Check the wiring and ensure the power supply voltage is within the specified range (2.4V to 5.5V). Verify that the Trig and Echo pins are connected to the correct microcontroller pins.

2. Inaccurate Distance Measurements

   • Solution: Ensure there are no obstructions or reflective surfaces near the sensor that could cause false readings. Verify that the sensor is mounted perpendicular to the target surface.

3. Interference Between Multiple Sensors

   • Solution: Trigger each sensor sequentially with a delay between measurements to prevent ultrasonic wave interference.

4. UART Communication Issues

   • Solution: Confirm that the baud rate is set to 9600 bps and that the Trig/TX and Echo/RX pins are correctly connected to the microcontroller's RX and TX pins.

1. Can the US100 measure distances below 2 cm?
   No, the minimum measurable distance is 2 cm. Objects closer than this may not be detected accurately.

2. What is the maximum range of the US100?
   The sensor can measure distances up to 450 cm under ideal conditions.

3. Can the US100 operate outdoors?
   Yes, but ensure the sensor is protected from direct exposure to rain or extreme environmental conditions.

4. Is the US100 compatible with Raspberry Pi?
   Yes, the US100 can be used with Raspberry Pi via GPIO pins or UART communication.