如何在 I2C 中使用 Arduino 从 LIDAR 的正确地址读取？

Question

我需要使用 Arduino Nano 从 I2C 中的激光雷达读取距离数据。目前，这是我编写的代码。

unsigned int readDistance()
{
  unsigned int dist = 0 ; // LiDAR actually measured distance value. static so we can return previous dist
  
  // step 1: instruct sensor to read echoes
  Wire.beginTransmission(0x10) ; // transmit to device 0x10
  Wire.write(2) ; // sets distance data address (addr)
  Wire.write(3) ; // sets distance data address (addr)
  Wire.endTransmission() ; // stop transmitting
  
  // step 2: wait for readings to happen
  delay(100) ; // datasheet suggests at least 100ms
  
  // step 3: request reading from sensor
  Wire.requestFrom(0x10, 2) ; // request 2 bytes (DIST_L, DIST_H) from slave device #0x10
  dist = Wire.read() ; dist += Wire.read() << 8; // calculate distance value, bit shift high distance
  return dist ; // return updated dist
}

但我感觉我从错误的数据地址请求'，因为我没有得到我期望的结果（即变化的距离数据）。此外，我使用了一个 I2C 扫描仪，它 100% 确认激光雷达位于（默认地址）0x10。

（TF02 Pro）数据表：https://www.unmannedtechshop.co.uk/wp-content/uploads/2020/01/TF02-Pro-Product-Manual-Alpha.pdf

问题：我是从正确的数据地址读取数据 任何帮助将不胜感激。

Answer 1

根据数据手册，正确的读取命令是五个字节：5A 05 00 01 60。它不像典型的 i2c 设备那样工作。

unsigned int readDistance()
{
  unsigned int dist = 0 ; // LiDAR actually measured distance value
  
  // step 1: instruct sensor to read echoes
  Wire.beginTransmission(0x10) ; // transmit to device 0x10
  Wire.write(0x5A) ; // some read command.
  Wire.write(0x05) ;
  Wire.write(0x00) ;
  Wire.write(0x01) ;
  Wire.write(0x60) ;
  Wire.endTransmission() ; // stop transmitting
  
  // step 2: wait for readings to happen
  delay(100) ; // datasheet suggests at least 100ms
  
  // step 3: request reading from sensor
  Wire.requestFrom(0x10, 4) ; // request first 4 bytes from slave device #0x10
  Wire.read() ; Wire.read() ; //ignore header bytes
  // remaining two bytes for distance (DIST_L, DIST_H) 
  dist = Wire.read() ; dist += Wire.read() << 8 ; // calculate distance value, bit shift high distance
  return dist ; // return updated dist
}