Sensor de pressão Baromética – BMP280

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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