Arduino BMP280 pressure/altitude

Help me by sharing this post


←PREVIOUS TUTORIAL       NEXT TUTORIAL→

The barometric pressure sensor BMP180 is designed to read the atmospheric pressure and thus indirectly estimate the height above sea level. The atmospheric pressure is the force exerted by the air (atmosphere) on the surface of the earth. The atmospheric pressure is due to the weight of the air column over a certain area, that is why when measuring the atmospheric pressure in higher altitude points, the pressure value is lower because the amount of air is lower. The atmospheric pressure also varies with the climate, mainly with the temperature, since it changes the density of the air, which is reflected in a change in the weight and therefore in a change of pressure.

Arduino BMP180 altitude tutorial



PART 1 - Schematic

The connections are pretty easy, see the image below with the breadboard circuit schematic. The BMP280 uses i2c communication so connect SCL to A5 of the Arduino and SDA to A4 of the Arduino. Do the same for the i2c LCD incase that you want to print the results on the LCD. The LED is extra. The SD0 pin will set the slave adress, in this case it's connected to Vcc so slave adress is 0x77.

We need:
1 x Arduino NANO/UNO: LINK eBay
1 x BMP280 module: LINK eBay
1 x i2c LCD: LINK eBay
1 x Jump wires: LINK eBay
1 x Breadboard: LINK eBay

Arduino BMP280 BMP180 connection schematic




PART 2 - Pressure and altitude CODE - serial print

We use i2c to get the raw data from the module and with the pressure we get the altitude. We print the data to the Serial monitor or to the LCD if we use the other code. Download the code, compile and upload.


Download serial monitor example code:
Download Adafruit_Sensor library:
Download Adafruit_BMP280 library:


#include <Wire.h>
#include <SPI.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP280.h>

#define BMP_SCK 13
#define BMP_MISO 12
#define BMP_MOSI 11 
#define BMP_CS 10

Adafruit_BMP280 bme; // I2C  if this is definded we use i2c communication
//Adafruit_BMP280 bme(BMP_CS); // hardware SPI
//Adafruit_BMP280 bme(BMP_CS, BMP_MOSI, BMP_MISO,  BMP_SCK);
  
void setup() {
  Serial.begin(9600);
  Serial.println(F("BMP280 test"));
  
  if (!bme.begin()) {  
    Serial.println("Could not find a valid BMP280 sensor, check wiring!");
    while (1);
  }
}
  
void loop() {
    Serial.print("Temperature = ");
    Serial.print(bme.readTemperature());
    Serial.println(" *C");    
    Serial.print("Pressure = ");
    Serial.print(bme.readPressure());
    Serial.println(" Pa");
    Serial.print("Approx altitude = ");
    Serial.print(bme.readAltitude(1013.25)); // this should be adjusted to your local forcase
    Serial.println(" m");    
    Serial.println();
    delay(2000);
}


Upload the code and make the connections. Then open the serial monitor at 9600 bauds and you will have the result printed to the serial monitor. Or go below and download the code with the i2c LCD.





PART 3 - Pressure and altitude CODE - results on LCD

Download LCD example code:
Download i2c LCD library:


#include <Wire.h>
#include <SPI.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP280.h>
#include <LiquidCrystal_I2C.h>
// Set the LCD address to 0x27 or 0x3f for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 20, 4);

#define BMP_SCK 13
#define BMP_MISO 12
#define BMP_MOSI 11 
#define BMP_CS 10

Adafruit_BMP280 bme; // I2C  if this is definded we use i2c communication
//Adafruit_BMP280 bme(BMP_CS); // hardware SPI
//Adafruit_BMP280 bme(BMP_CS, BMP_MOSI, BMP_MISO,  BMP_SCK);
  
void setup() {
  lcd.init();
  lcd.backlight();
  Serial.begin(9600);
  Serial.println(F("BMP280 test"));
  
  if (!bme.begin()) {  
    Serial.println("Could not find a valid BMP280 sensor, check wiring!");
    while (1);
  }
}
  
void loop() {
    Serial.print("Temperature = ");
    Serial.print(bme.readTemperature());
    Serial.println(" *C");    
    Serial.print("Pressure = ");
    Serial.print(bme.readPressure());
    Serial.println(" Pa");
    Serial.print("Approx altitude = ");
    Serial.print(bme.readAltitude(1013.25)); // this should be adjusted to your local forcase
    Serial.println(" m");    
    Serial.println();
    lcd.clear();    
    lcd.setCursor(0,0);
    lcd.print(bme.readPressure());
    lcd.setCursor(12,0);
    lcd.print(bme.readAltitude(1013.25));
    lcd.setCursor(0,1);
    lcd.print("Pa             m");
    delay(2000);
}

Upload the code and make the connections. Then open the serial monitor at 9600 bauds or just see the results on the LCD screen.





←PREVIOUS TUTORIAL       NEXT TUTORIAL→

Help me by sharing this post








yt_link
insta_link
fb_link
twitter_link

BMP280 pressure
page 1/1



ADVERTISERS
PCBWAY PCB service





Gearbest Alfawise U30 2.8 inch Touch Screen DIY Desktop 3D Printer - U30 EU Plug Black
Alfawise U30 2.8 inch Touch Screen DIY Desktop 3D Printer - U30 EU Plug Black only $$162.89

AFFILATE

Gearbest Creality3D CR - 10S 3D Printer - EU Plug Upgrade Version Coffee and Black
Creality3D CR - 10S 3D Printer - EU Plug Upgrade Version Coffee and Black only $$352.94

Gearbest Creality 3D Ender-3 V-slot Prusa I3 DIY 3D Printer Kit 220 x 220 x 250mm Printing Size - EU Plug Black
Creality 3D Ender-3 V-slot Prusa I3 DIY 3D Printer Kit 220 x 220 x 250mm Printing Size - EU Plug Black only $$153.84

Gearbest Alfawise U20 Large Scale 2.8 inch Touch Screen DIY 3D Printer - EU - U20 EU Plug Black
Alfawise U20 Large Scale 2.8 inch Touch Screen DIY 3D Printer - EU - U20 EU Plug Black only $$253.39