BMP280 Barometer & Temperatur I2C Module

BMP280 Barometer & Temperatur I2C Module er et Temperatur/Barometrisk Tryksensor inkluderer den populære sensor til måling af tryk og beregning af højde lokalt. Måler selvfølgelig også temperatur.

Tekniske detaljer:

Voltage: 1.8-3.6V
Working Temperature: -30 c ~ 70 c
Interface: I2C/IIC
Driver IC: BMP280

The key features are:

• Pressure range: 300 to 1100 hPa
• Capable of measuring temperature
• Pressure measurement accuracy: 0.12 hPa
• Support I2C communication up to 3.4 MHz
• Support SPI communication up to 10 MHz

#include <Wire.h> 
 
void setup()
{
  Wire.begin();
 
  Serial.begin(9600);
  while (!Serial);             //  wait for serial monitor
  Serial.println("nI2C Scanner");
}
 
 
void loop()
{
  byte error, address;
  int nDevices;
 
  Serial.println("Scanning...");
 
  nDevices = 0;
  for(address = 1; address < 127; address++ )
  {
    // The i2c_scanner uses the return value of
    // the Write.endTransmisstion to see if
    // a device did acknowledge to the address.
    Wire.beginTransmission(address);
    error = Wire.endTransmission();
 
    if (error == 0)
    {
      Serial.print("I2C device found at address 0x");
      if (address<16)
        Serial.print("0");
      Serial.print(address,HEX);
      Serial.println("  !");
 
      nDevices++;
    }
    else if (error==4)
    {
      Serial.print("Unknown error at address 0x");
      if (address<16)
        Serial.print("0");
      Serial.println(address,HEX);
    }    
  }
  if (nDevices == 0)
    Serial.println("No I2C devices foundn");
  else
    Serial.println("donen");
 
  delay(5000);           // wait 5 seconds for next scan
}

Kode (Programmering)

Nu har jeg fundet adressen på modulet. Min er “0x76”

#include <Wire.h>
#include "SPI.h" //Why? Because library supports SPI and I2C connection
#include <Adafruit_Sensor.h>
#include "Adafruit_BMP280.h"

//Setup connection of the sensor
Adafruit_BMP280 bmp; // I2C
/*//For SPI connection!
#define BMP_SCK 13
#define BMP_MISO 12
#define BMP_MOSI 11 
#define BMP_CS 10
//Adafruit_BMP280 bme(BMP_CS); // hardware SPI
//Adafruit_BMP280 bme(BMP_CS, BMP_MOSI, BMP_MISO, BMP_SCK);
*/

//Variables
float pressure; //To store the barometric pressure (Pa)
float temperature; //To store the temperature (oC)
int altimeter; //To store the altimeter (m) (you can also use it as a float variable)

void setup() {
bmp.begin(0x76); //Begin the sensor 7 adress
Serial.begin(9600); //Begin serial communication at 9600bps
Serial.println("Adafruit BMP280 test:");
}

void loop() {
//Read values from the sensor:
pressure = bmp.readPressure();
temperature = bmp.readTemperature();
altimeter = bmp.readAltitude (1050.35); //Change the "1050.35" to your city current barrometric pressure (https://www.wunderground.com)

//Print values to serial monitor:
Serial.print(F("Pressure: "));
Serial.print(pressure);
Serial.print(" Pa");
Serial.print("\t");
Serial.print(("Temp: "));
Serial.print(temperature);
Serial.print(" C");
Serial.print("\t");
Serial.print("Altimeter: ");
Serial.print(altimeter); // this should be adjusted to your local forcase
Serial.println(" m");

delay(5000); //Update every 5 sec
}

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