Description

Gravity: URM09 Ultrasonic Sensor 3.3/5V

This is a non-contact ultrasonic ranging sensor of high-performance from URM09 series, employing standard PH2.0-3P Gravity vertical interface. It provides an accuracy of 1% within an effective measuring range of 2~500cm. Similar to SR04 ultrasonic ranging modules in principle and using method, the ranging function of this sensor is triggered by high/low-level output from the I/O ports of a host, and then the sensor converts ultrasonic flight time into a high pulse to output. The difference is that this sensor multiplexes input and output signals onto one signal port, which allows users to easily use the sensor for distance measurement only by one I/O port of a controller. Meanwhile, the adoption of advanced hardware and software design ensures excellent and reliable measuring performance. The module works well with 3.3V/5V controllers like Arduino, Raspberry Pi, etc.

Quick Spec

Operating Voltage: 3.3~5.5V DC
Max Instantaneous Working Current: <20mA
Operating Temperature Range: -10℃～＋70℃
Effective Ranging Range: 2cm～500cm
Resolution: 1cm
Accuracy: 1%
Acoustic Frequency: 40±2KHz
Ranging Frequency: 25Hz Max
Dimension: 47 × 22mm
Net Weight: 17g

Wiring Diagram

Sample Code



/*!
       This example is the ultrasonic distance measurement of the module.

       Copyright   [DFRobot](http://www.dfrobot.com), 2020
       Copyright   GNU Lesser General Public License

       version  V1.0
       date  29/10/2020
*/

#define    VELOCITY_TEMP(temp)       ( ( 331.5 + 0.6 * (float)( temp ) ) * 100 / 1000000.0 ) // The ultrasonic velocity (cm/us) compensated by temperature

int16_t trigechoPin = 11;
uint16_t distance;
uint32_t pulseWidthUs;
void setup() {
  Serial.begin(9600);
  delay(100);
}
void loop() {
  int16_t  dist, temp;
  pinMode(trigechoPin,OUTPUT);
  digitalWrite(trigechoPin,LOW);

  digitalWrite(trigechoPin,HIGH);//Set the trig pin High
  delayMicroseconds(10);     //Delay of 10 microseconds
  digitalWrite(trigechoPin,LOW); //Set the trig pin Low

  pinMode(trigechoPin,INPUT);//Set the pin to input mode
  pulseWidthUs = pulseIn(trigechoPin,HIGH);//Detect the high level time on the echo pin, the output high level time represents the ultrasonic flight time (unit: us)

  distance = pulseWidthUs * VELOCITY_TEMP(20) / 2.0;//The distance can be calculated according to the flight time of ultrasonic wave,/
                                                    //and the ultrasonic sound speed can be compensated according to the actual ambient temperature
  Serial.print(distance, DEC);
  Serial.println("cm");
  delay(500);
}