[PM2008] 보정

pm2008_calibration.ino

#include <Wire.h>

#define PM2008_I2C_ADDRESS                    0x28

// Control modes
#define PM2008_I2C_CTRL_CLOSE_MEASUREMENT                 0x1
#define PM2008_I2C_CTRL_OPEN_SINGLE_MEASUREMENT           0x2
#define PM2008_I2C_CTRL_SET_UP_CONTINUOUSLY_MEASUREMENT   0x3
#define PM2008_I2C_CTRL_SET_UP_TIMING_MEASUREMENT         0x4
#define PM2008_I2C_CTRL_SET_UP_DYNAMIC_MEASUREMENT        0x5
#define PM2008_I2C_CTRL_SET_UP_CALIBRATION_COEFFICIENT    0x6
#define PM2008_I2C_CTRL_SET_UP_WARM_MODE                  0x7

#define PM2008_I2C_CONTROL_MODE               PM2008_I2C_CTRL_SET_UP_CALIBRATION_COEFFICIENT

#define PM2008_I2C_FRAME_HEADER               0x16

void setup() {
  Wire.begin();
  uint8_t buffer[7];

  buffer[0] = PM2008_I2C_FRAME_HEADER;
  buffer[1] = 0x7; // frame length
  buffer[2] = PM2008_I2C_CONTROL_MODE;

  uint16_t data = 70; // 70 ~ 150

  buffer[3] = data >> 8;
  buffer[4] = data & 0xFF;
  buffer[5] = 0; // Reserved

  // Calculate checksum
  buffer[6] = buffer[0];

  for (uint8_t i = 1; i < 6; i++) {
    buffer[6] ^= buffer[i];
  }

  Wire.beginTransmission(PM2008_I2C_ADDRESS);
  Wire.write(buffer, 7);
  Wire.endTransmission();
}

void loop() {}