What is BMP280: Pinout, Specifications & Working

What is a BMP280 Sensor?

The BMP280 sensor is a high-precision sensor module that detects atmospheric temperature, atmospheric pressure and air humidity. The module supports both, the SPI interface as well as the I2C interface. Unlike other sensors, these sensors have already been calibrated. They can start measuring temperature, pressure, and humidity  as soon as they are turned on, and no further calibration is required.

What is a BMP280 sensor

As per the BMP280 datasheet, the sensor module requires a minimum voltage (VDD) of 1.71V, whereas sensor modules from earlier versions require 1.8V. (VDD). Current usage for the BMP280 is 2.7uA, while that for the BMP180 is 12uA, and that for the BMP183 and BMP085 is 5uA respectively. New filter modes are also supported by the BMP280. The remaining sensors only support either I2c or SPI, but the BMP280 sensor module supports both I2c and SPI protocols. The precision of the BMP280 sensor module is 0.12 hPa or a change in height of 1 m. It is frequently utilized in many applications because of these essential characteristics. Small signals are amplified using these front-end ICs, which are sensitive analogue amplifiers. Then, this o/p of the signal is given to the Analog to Digital Converter, which converts the analog signal into a digital signal. The logic circuits use this voltage to interface with the rest of the device.

 

This is an inexpensive sensor that measures temperature and barometric pressure, but because pressure varies with altitude, we can also use it as an altimeter with an accuracy of about one meter. However, there is another sensor called BME280 that offers Temperature, Humidity, Barometric Pressure, and Altitude, but as you can surely assume, it is rather expensive if you want to get all the weather information in one package.

What is BMP280 used for?

The BMP280 is a barometric pressure sensor with built-in temperature compensation. Due to the very small footprint of SMD devices (2.0mm x 2.5mm), a breakout board is required for bench use. It's so tiny that you can use it on your mobile phone. Until you realize that pressure can also be used to measure altitude, you might think that this device would only be used in a weather station environment. This sensor is used for two purposes one is to measure the Barometric pressure and the second thing to measure temperature. This sensor is used for smart cities, smart homes and other IoT applications.

BMP280 Pin Configuration

BMP280 Pin Configuration

VCC

Sensor Power Supply 3.3V

GND

Common ground

SCL

Serial Clock Pin

SDA

Serial Data Pin

CSB

This is chip select pin for SPI communication.

SDO

Serial Data Out for SPI communication.

Features:

  • For detecting temperature with a 1.0¬įC accuracy and barometric pressure with an absolute accuracy of 1 hPa, this precision sensor is the best low-cost option.¬†
  • It may also be used as an altimeter with an accuracy of 1 meters because pressure fluctuates with altitude and pressure measurements are so accurate.
  • Pitch of a pin: 2.54mm
  • Module Dimensions: 11.5mm x 15mm

Specifications: 

Chip name

BMP280

Power Supply

3V or .3.3 V DC

Max Current

1.12mA

Air pressure

300 - 1100hPa

Temerature range

-40 to +85 degree Celsius

Interfaces

I2C and SPI

Current consumption by sensor

2.7 mA

Sampling rate

1 Hz

How Does bmp280 Sensor Works?  

The  sensor module BMP280 operates at a minimum voltage (VDD) of 1.71 V, whereas previous versions of the  sensor module operate at 1.8 V (VDD).

 

In terms of power consumption, the BMP280 consumes 2.7uA,  the BMP180 consumes 12uA, and the BMP183 and BMP085 consume 5uA each.  BMP280 also supports a new filter mode.

 

The BMP280 sensor module supports I2c and SPI protocols,¬† the rest of the sensors support either I2c or SPI. The BMP280 sensor module has an accuracy of ¬Ī0.12 hPa, which corresponds to a height difference of ¬Ī1 m. These important features make it mainly used in various applications. A BMP sensor consists of a pressure sensing element, a humidity sensing element, and a temperature sensing element, which are further connected to a pressure front end, a humidity front end, and a temperature front end.

 

These front-end ICs are delicate analog amplifiers  used to amplify small signals. The output of this analog front-end IC is fed to the ADC as an input signal. In it, analog values are converted into digital voltages, and this voltage is fed to  logic circuits and further interfaces with the outside world. 

 

The BMP280 sensor module is configured with three power modes: sleep mode, force mode, and normal mode. In sleep mode, no measurements are taken and power consumption is minimized. In forced mode, a single measurement is taken according to the selected measurement and filter options. In normal mode, measurement and standby periods alternate continuously, the cycle time of which is defined by Tstandby. The current in  standby mode is slightly higher than in sleep mode.

How to work with the BMP280 Sensor?

To work with the sensor, you need to connect a microcontroller, As shown below, we just connect the BMP280 sensor  to the ESP32's I2C pin.

How to work with the BMP280 Sensor

Connections as per above depicted Diagram

ESP32

BMP280

3.3V

VCC

GND

GND

SCL

22

SDA

21

Code:


#include <BMP280_DEV.h>                          

 

float temperature, pressure, altitude;            

BMP280_DEV bmp280(21, 22);  //(SDA and SCL pins)                      

 

void setup()

{

  Serial.begin(115200);                      

  bmp280.begin();                                

  bmp280.setTimeStandby(TIME_STANDBY_2000MS);    

  bmp280.startNormalConversion();                

}

 

void loop()

{

  if (bmp280.getMeasurements(temperature, pressure, altitude))      

  {

    Serial.print(temperature);                    

    Serial.print(F("*C   "));

    Serial.print(pressure);    

    Serial.print(F("hPa   "));

    Serial.print(altitude);

    Serial.println(F("m"));  

  }

}



Applications:

  • Smart Agricultural systems: The BMP 280 measures atmospheric pressure. These sensors are connected to a Wi-Fi module (node MCU) and depend on each other to increase the sensitivity of the irrigation system. Collected data is uploaded to the cloud.
  • Home weather stations and weather forecasts
  • ¬†Mobile Phones: This module is small and lightweight making it easy to implement in mobile phones.

Components and Supplies

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