KY-052 Pressure sensor / Temperature sensor (BMP280)

The BMP280 is a versatile sensor that measures both barometric pressure and temperature and outputs the results via the I2C bus. With this sensor you can capture precise air pressure and temperature values, making it ideal for applications such as weather stations, altimeters and mobile devices.

It covers a wide pressure range corresponding to altitudes from +9000 to -500 meters above or below sea level. The measured data is very accurate, which means you get reliable information about the ambient conditions. The sensor can operate in a wide temperature range, from -40 to +85°C, making it suitable for many environments.

Thanks to the digital interfaces (I²C and SPI), the BMP280 can be easily integrated into various microcontroller and computer systems. This facilitates the development of projects that require accurate environmental measurements. The sensor's low power consumption also makes it ideal for use in battery-powered devices.

Overall, the BMP280 provides a simple and effective solution for accurately monitoring air pressure and temperature, making it a valuable component for a variety of applications.

Pin assignment

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

Code example

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.

To load the following code example onto your Arduino, we recommend using the Arduino IDE. In the IDE, you can select the appropriate port and the correct board for your device.

The following libraries are also used for the code example:

Adafruit_BMP280 from Adafruit | published under BSD-License

You can easily add these libraries via the library manager of the Arduino IDE. Then copy the code below into your IDE. To upload the code to the Arduino, simply click on the upload button.

/***************************************************************************
  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 andopen-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 pins of the BMP280
#define BMP_SCK 13
#define BMP_MISO 12
#define BMP_MOSI 11 
#define BMP_CS 10

// Initialize BMP280
Adafruit_BMP280 bmp;
 
void setup() {
  // Initialize serial monitor
  Serial.begin(9600);
  Serial.println(F("KY-052 BMP280 test"));
  // Establish connection with BMP280
  if (!bmp.begin()) {  
    Serial.println(F("Could not find a valid BMP280 sensor, check wiring!"));
    while (1);
  }
}
 
void loop() {
  // Output measured values from the BMP280
  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("Altitude = "));
  // This value must be changed to the current air pressure at your location
  // otherwise there will be inaccuracies
  // Weather services can give you information
  // 1013.25 hPa is the mean air pressure at sea level
  Serial.print(bmp.readAltitude(1013.25)); 
  Serial.println(" m");
    
  Serial.println();
  delay(2000);
}