KY-052 Pressure sensor / Temperature sensor (BMP280)

This pressure sensor measures the air pressure at the sensor output and outputs the result coded on the I2C bus.

A corresponding library is required for this module - see code examples below.

Technical specifications

Pin assignment

This sensor allows to be connected and operated on 5 V systems as well as on 3.3 V systems.

Code example Arduino

Pin assignment Arduino

This sensor does not output its measurement result as a signal on its output pin, but communicates it via I2C bus. The sensor can be controlled via this bus and the respective measurements of pressure and temperature can be started and evaluated.

There are several ways to control this sensor module - the Adafruit_BMP280 library has proven to be particularly accessible, which is provided by Adafruit published under the OpenSource BSD license.

The example below is based on this library. For this we recommend to download it, unzip it and copy it in the Arduino library folder, which is located by default in (C:\User[username]\Documents\Arduino\libraries), so that it is available for the code example and following projects. Alternatively, the library is also included in the download package below.

/ ************************************************* **************************
  This is a library for the BMP280 humidity, temperature & pressure sensor
 
  Designed specifically to work with the Adafruit BMEP280 Breakout
  ----> http://www.adafruit.com/products/2651
 
  These sensors use I2C or SPI to communicate, 2 or 4 pins are required
  to interface.
 
  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing products
  from Adafruit!
 
  Written by Limor Fried & Kevin Townsend for Adafruit Industries.
  BSD license, all text above must be included in any redistribution
 ************************************************** ************************* /
 
#include <Wire.h>
#include <SPI.h>
#include <Adafruit_BMP280.h>
 
 
#define BMP_SCK 13
#define BMP_MISO 12
#define BMP_MOSI 11
#define BMP_CS 10
 
Adafruit_BMP280 bmp; // I2C
// Adafruit_BMP280 bmp (BMP_CS); // hardware SPI
// Adafruit_BMP280 bmp (BMP_CS, BMP_MOSI, BMP_MISO, BMP_SCK);
 
void setup () {
  Serial.begin (9600);
  Serial.println (F ("BMP280 test"));
   
  if (! bmp.begin ()) {
    Serial.println (F ("Could not find a valid BMP280 sensor, check wiring!"));
    while (1);
  }
}
 
void loop () {
    Serial.print (F ("Temperature ="));
    Serial.print (bmp.readTemperature ());
    Serial.println ("* C");
     
    Serial.print (F ("Pressure ="));
    Serial.print (bmp.readPressure ());
    Serial.println ("Pa");
 
    Serial.print (F ("Approx altitude ="));
    Serial.print (bmp.readAltitude (1013.25)); // this should be adjusted to your local forcase
    Serial.println ("m");
     
    Serial.println ();
    delay (2000);
}

Sample program download

KY052-Arduino.zip