Grove - Barometer Sensor(BME280)

Introduction

Grove - Barometer Sensor (BME280) is a breakout board for Bosch BMP280 high-precision, low-power combined humidity, pressure, and temperature sensor. This module can be used to measure temperature, atmospheric pressure and humidity accurately and fast. As the atmospheric pressure changes with altitude, it can also measure approximate altitude of a place. It can be connected to a microcontroller with I²C (integrated with Grove socket) or through SPI bus. We have also provided highly abstracted library to make this more product easier to use.

The BME280 is an upgraded version of BMP180, and BME280 gets dramatic improvements from BMP180. BME280 comes with a smaller footprint, lower power consumption, lower noise measurements, higher resolutions for pressure and temperature, lower RMS noise, newly added SPI bus, more measuring modes, higher measuring rate, and newly added filter against environmental interference. Since the atmosphere pressure reading is affected by altitude and temperature, we have added compensation features. Hence, Grove - Barometer Sensor (BME280) will be more reliable in providing precise temperature, atmospheric pressure values, humidity and approximate altitude data.

Using the sensor is easy. For Seeeduino (compliant with Arduino), just connect this breakout board using Grove cable to I2C Grove connector. Then, use the provided library and example code from GitHub. If you are using an Arduino either use Base Shield v2.0 or simply connect the VCC pin to the 5V voltage pin, GND to ground, SCL to I2C Clock (Analog 5) and SDA to I2C Data (Analog 4).

Typical applications: Enhancement of GPS navigation, outdoor/indoor navigation, weather forecast, or any other project that requires accurate atmospheric pressure reading.

Features

• Get more precise temperature, atmospheric pressure values, humidity and approximate altitude data fast.
• Grove compatible and easy to use
• Highly abstracted library for building projects quicker

Specifications

Parameter	Value
Input voltage	3.3V or 5V
I/O voltage	3.3V or 5V
Operating current	0.4mA
Operating temperature	-40 - 85 ℃
Atmospheric pressure sensor measurement range	300 - 1100 hPa (1 hPa= one hundred Pa) with ±1.0 hPa accuracy
Temperature sensor measurement range	-40 - 85 ℃, with ±1.0°C accuracy
Humidity sensor measurements range	0% - 100% relative humidity , with ±3% accuracy
Measurement modes	Piezo & Temperature, forced or periodic
Chip	BME280(datasheet)
Interface Bus	SPI, I2C (use either one of them)
Weight	3.2 g (for breakout board), 9.3 g for whole package each piece
Dimensions	40 (length) × 20 (width) mm

Platforms Supported

Hardware Overview

• SPI soldering pads, a voltage monitoring circuit.
• Interface bus selection pads , to select I²C bus, connect the two pads by soldering (it is connected by default); to select SPI bus, cut the two pads with a sharp knife or a soldering iron.

• Slave board address selection pads, to select slave board address to avoid address collision.

  • If you have selected I2C bus, the default address for slave board is 0x76 (right-two pads are connected). If you want to use the address 0x77, connect only the left two (disconnect right two) by soldering.

    Tip

    You can disconnect pads with just a sharp knife.
  • If you have selected SPI bus, the default address for slave board is 0x76 (right-two pads are connected). If you want to use the address 0x77, disconnect all three pads.

Package includes (main parts)

Parts name	Quantity
Grove - Barometer Sensor (BME280)	1 piece
Grove cable	1 piece

Getting Started

Now let us run some basic examples with this module.

With Arduino

This section shows you how to build a simple project with Arduino platform. Even if you are using a different type of main control board, these instructions and source code are useful.

Materials required

• Grove - Barometer Sensor (BME280) × 1
• Seeeduino 4.2 (fully compatible with Arduino) or Arduino UNO (other models are also fine) × 1
• Grove - Base Shield × 1 (it is optional if you are using Seeeduino which has two I2C sockets on Seeeduino v4.2)
• USB cable (type A to type B, for Arduino) × 1 or USB cable (Type-A to micro Type-B, for Seeeduino) × 1
• Grove cable × 1

Connections

Connect all parts as follows: the first picture shows connection with Seeeduino, the second one demonstrates connection with Arduino UNO:

Coding Work

You can find more demo sketches here and development library here.

1. A typical demo code. You can upload code to main control board with Codebender.

2. Download and upload the code. If you do not know how to upload an Arduino sketch, please visit https://www.arduino.cc/en/Guide/Windows for Windows user or https://www.arduino.cc/en/Guide/MacOSX for Mac user. You can see the result as below.

Resources

• Schematic(Eagle) file
• BME280 Datasheet
• Library and example code on GitHub
• I²C how-to for Arduino

Help us make it better

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