GY-39 设计微型气象站C语言代码

以下是一个简单的GY-39微型气象站的C语言代码示例，可以通过串口将读数发送到计算机上：

#include <Wire.h>
#include <SoftwareSerial.h>

SoftwareSerial mySerial(10, 11); // RX, TX

// I2C address of GY-39 sensor
#define GY39_I2C_ADDRESS 0x5C

// GY-39 sensor register addresses
#define GY39_TEMP_ADDRESS 0x01
#define GY39_HUMIDITY_ADDRESS 0x02
#define GY39_PRESSURE_ADDRESS 0x03
#define GY39_ALTITUDE_ADDRESS 0x04

void setup() {
  // start serial communication
  Serial.begin(9600);
  mySerial.begin(9600);
  // start I2C communication
  Wire.begin();
}

void loop() {
  float temperature = readTemperature();
  float humidity = readHumidity();
  float pressure = readPressure();
  float altitude = readAltitude(pressure);

  // print data to serial monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" C  Humidity: ");
  Serial.print(humidity);
  Serial.print(" %  Pressure: ");
  Serial.print(pressure);
  Serial.print(" Pa  Altitude: ");
  Serial.print(altitude);
  Serial.println(" m");

  // send data to computer through serial interface
  mySerial.print(temperature);
  mySerial.print(",");
  mySerial.print(humidity);
  mySerial.print(",");
  mySerial.print(pressure);
  mySerial.print(",");
  mySerial.println(altitude);

  // wait a moment before taking another reading
  delay(1000);
}

// read temperature from GY-39 sensor
float readTemperature() {
  byte data[2];
  Wire.beginTransmission(GY39_I2C_ADDRESS);
  Wire.write(GY39_TEMP_ADDRESS);
  Wire.endTransmission(false);
  Wire.requestFrom(GY39_I2C_ADDRESS, 2);
  data[0] = Wire.read();
  data[1] = Wire.read();
  return ((data[0] << 8) | data[1]) / 100.0;
}

// read humidity from GY-39 sensor
float readHumidity() {
  byte data[2];
  Wire.beginTransmission(GY39_I2C_ADDRESS);
  Wire.write(GY39_HUMIDITY_ADDRESS);
  Wire.endTransmission(false);
  Wire.requestFrom(GY39_I2C_ADDRESS, 2);
  data[0] = Wire.read();
  data[1] = Wire.read();
  return ((data[0] << 8) | data[1]) / 1024.0;
}

// read pressure from GY-39 sensor
float readPressure() {
  byte data[2];
  Wire.beginTransmission(GY39_I2C_ADDRESS);
  Wire.write(GY39_PRESSURE_ADDRESS);
  Wire.endTransmission(false);
  Wire.requestFrom(GY39_I2C_ADDRESS, 2);
  data[0] = Wire.read();
  data[1] = Wire.read();
  return ((data[0] << 8) | data[1]) / 100.0;
}

// calculate altitude based on pressure and sea level pressure
float readAltitude(float seaLevelPressure) {
  float pressure = readPressure();
  float altitude = 44330.0 * (1.0 - pow(pressure / seaLevelPressure, 0.1903));
  return altitude;
}

注意：这个示例代码并没有包括GY-39传感器的I2C地址设置，如果你的传感器地址不是默认的0x5C，请根据你的传感器地址进行相应的修改。