Example Code for Arduino-Auto Measure Mode

Hardware Preparation

• Arduino board: Quantity1
• URM37 V5.0 ultrasonic sensor (SKU:SEN0001): Quantity1
• Jumper wires: Quantity several

Software Preparation

• Arduino IDE: Download from Arduino official website

Wiring Diagram

Other Preparation Work

1. Ensure the sensor's serial level is set to TTL mode (default) using the button method described in Getting Started section.
2. Connect the hardware as per the wiring diagram (note: download first before connecting Arduino TX/RX to avoid failure).

Sample Code

// # Editor     : roker
// # Date       : 05.03.2018
// # Product name: URM V5.0 ultrasonic sensor
// # Product SKU : SEN0001
// # Version     : 1.0
// # Description:
// # The sketch for using the URM37 autonomous  mode from DFRobot
// #   and writes the values to the serialport
// # Connection:
// #       Vcc (Arduino)      -> Pin 1 VCC (URM V5.0)
// #       GND (Arduino)      -> Pin 2 GND (URM V5.0)
// #       Pin 3 (Arduino)    -> Pin 4 ECHO (URM V5.0)
// #       Pin TX1 (Arduino)  -> Pin 8 RXD (URM V5.0)
// #       Pin RX0 (Arduino)  -> Pin 9 TXD (URM V5.0)
// # Working Mode:  Automatic measurement model.
int URECHO = 3; // PWM Output 0－50000US，Every 50US represent 1cm
unsigned int Distance = 0;
uint8_t AutomaticModelCmd[4] = {0x44, 0x02, 0xaa, 0xf0}; // distance measure command
void setup() 
{                                
  Serial.begin(9600);           // Serial initialization           
  delay(5000);                   // wait for sensor setup
  AutomaticModelSetup();        //Automatic measurement model set
}
void loop()
{
  AutomaticMeasurement();
  delay(100);
}                     
void AutomaticModelSetup(void)
{
  pinMode(URECHO, INPUT);                     
  for (int i = 0; i < 4; i++)
  {
    Serial.write(AutomaticModelCmd[i]);// Sending Automatic measurement model command
  }
}
void AutomaticMeasurement(void)
{
  unsigned long DistanceMeasured = pulseIn(URECHO, LOW);
  if (DistanceMeasured >= 50000) // the reading is invalid.
  {
    Serial.print("Invalid");
  }
  else
  {
    Distance = DistanceMeasured / 50;       // every 50us low level stands for 1cm
    Serial.print("Distance=");
    Serial.print(Distance);
    Serial.println("cm");
  }  
}

Result

Arduino sends the distance information to the computer through serial port.