It can be used to measure temperature and atmospheric pressure accurately. It can be connected to a microcontroller with I2C.

Specifications

• Model: GY-BMP280-3.3


• Chip: BMP280


• Power supply: 3V/3.3V DC


• Peak current: 1.12mA


• Air pressure range : 300-1100hPa (equi. to +9000�-500m above sea level)


• Temperature range: -40 � +85 �C


• Digital interfaces: I�C (up to 3.4 MHz) and SPI (3 and 4 wire, up to 10 MHz)


• Current consumption of sensor BMP280: 2.7�A @ 1 Hz sampling rate

Applications

• Enhancement of GPS navigation (e.g. time-to-first-fix improvement, dead-reckoning, slope detection)


• Indoor navigation (floor detection, elevator detection)


• Outdoor navigation, leisure and sports applications


• Weather forecast, Home weather stations


• Health care application (e.g. sirometry)


• Vertical velocity indication (e.g. risk/sink speed)


• Handsets such as mobile phones, tablet PCs, GPS devices


• Flying toys


• Watches

How to use GY-BMP280 Module?

The GY-BMP280 module operates from 3.3V so requires 3.3V power and must be driven with 3.3V logic levels. If needed to operate at 5V, it can be done using voltage regulator and level shifters as it doesn�t contain one. It is typically recommended to operate it on 3.3V and maximum at 3.6VDC. The module GY-BMP280 module simply supports both I�C and SPI interfaces and comes with default I�C address of 0x76. The Chip Select (CSB) and Serial Data Output (SDO) pins of the BMP 280 are necessary only when SPI-based (four-wire) communication is applied. I2C is a two wire interface SDA SCK.

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

To change the I�C 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 I�C interface. This is already done by an on-board pull-up resistor, so pin 5 can be left disconnected when using the I�C interface.