Barometric Pressure Sensor – BMP280

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*Disclaimer: The images are merely illustrative.

Overview

Bosch has stepped up their game with their new BMP280 sensor, an environmental sensor with temperature, barometric pressure that is the next generation upgrade to the BMP085/BMP180/BMP183. This sensor is great for all sorts of weather sensing and can even be used in both I2C and SPI

This precision sensor from Bosch is the best low-cost, precision sensing solution for measuring barometric pressure with ±1 hPa absolute accuraccy, and temperature with ±1.0°C accuracy. Because pressure changes with altitude, and the pressure measurements are so good, you can also use it as an altimeter with  ±1 meter accuracy

Note: You need to add 5V to 3.3V level converter circuit between Arduino UNO R3 and the module.

or in alternative you could consider the following sensor: BMP280 Atmospheric Sensor Breakout

Features

• Pressure range: 300 ~ 1100hPa (altitude 9000 m ~ -500 m);
• Working voltage: 1.71 - 3.6VDC;
• Low power consumption: 4μA;
• High precision: at low-power mode, the resolution is 0.06hPa (0.5 meters);
• Temperature output;
• Communication interface: I2C or SPI;

GY-BMP280-3.3 Pressure Sensor Module Pinout

The image below shows a top view of the GY-BMP280-3.3 module with its pinout.

GY-BMP280-3.3 Pressure Sensor Module Pinout

GY-BMP280-3.3 Pressure Sensor Module Circuit Diagram

A circuit diagram of the GY-BMP280-3.3 pressure sensor module can be seen below.

GY-BMP280-3.3 Pressure Sensor Module Circuit Diagram

GY-BMP280-3.3 I2C Configuration

Leave pin 6 of the module (SDO) unconnected to set the I²C address to 0x76 – the on-board resistor pulls the SDO pin low setting the address to 0x76.

To change the I²C address to 0x77, connect pin 6 of the module (SDO) to Vcc which would typically be the 3.3V supply.

Pin 5 of the module (CSB) must be connected to Vcc to select the I²C interface. This is already done by an on-board pull-up resistor, so pin 5 can be left disconnected when using the I²C interface.

Datasheet

• BM280