Example Code for Arduino-Laser Distance Measurement

Hardware Preparation

• DFRduino UNO R3 (or similar) x 1
• Laser Ranging Sensor(4m) x1

Software Preparation

• Arduino IDE

Wiring Diagram

Other Preparation Work

Ensure the Arduino IDE is installed correctly. The Wire library (required for I2C communication) is included with the Arduino IDE by default, so no additional library installation is needed.

Sample Code

#include "Wire.h"
#define address 0x74

uint8_t buf[2] = { 0 };

void setup() {
  Serial.begin(115200);
  Wire.begin();
}

uint8_t dat = 0xB0;
int distance = 0;


void loop() {
  writeReg(0x10, &dat, 1);
  delay(50);
  readReg(0x02, buf, 2);
  distance = buf[0] * 0x100 + buf[1] + 10;
  Serial.print("distance=");
  Serial.print(distance);
  Serial.print("mm");
  Serial.println("\t");
  delay(100);
}

uint8_t readReg(uint8_t reg, const void* pBuf, size_t size) {
  if (pBuf == NULL) {
    Serial.println("pBuf ERROR!! : null pointer");
  }
  uint8_t* _pBuf = (uint8_t*)pBuf;
  Wire.beginTransmission(address);
  Wire.write(®, 1);
  if (Wire.endTransmission() != 0) {
    return 0;
  }
  delay(20);
  Wire.requestFrom(address, (uint8_t)size);
  for (uint16_t i = 0; i < size; i++) {
    _pBuf[i] = Wire.read();
  }
  return size;
}

bool writeReg(uint8_t reg, const void* pBuf, size_t size) {
  if (pBuf == NULL) {
    Serial.println("pBuf ERROR!! : null pointer");
  }
  uint8_t* _pBuf = (uint8_t*)pBuf;
  Wire.beginTransmission(address);
  Wire.write(®, 1);

  for (uint16_t i = 0; i < size; i++) {
    Wire.write(_pBuf[i]);
  }
  if (Wire.endTransmission() != 0) {
    return 0;
  } else {
    return 1;
  }
}

Result

View the distance value detected by the sensor through the serial port.