BMP280 Barometer – Precision Atmospheric Pressure Sensor Module

The BMP280 is a high-precision, low-power digital barometric pressure and temperature sensor designed by Bosch Sensortec, serving as an upgraded successor to the popular BMP180, BMP085, and BMP183 sensors. It is designed for mobile applications, such as smartphones, tablets, and wearables, due to its compact size, low power consumption, and high accuracy in altitude and pressure measurement.

Description and Key Features:

• Environmental Sensing: Measures barometric pressure (300 to 1100 hPa) and temperature (-40 to +85°C).
• High Accuracy & Precision: Provides an absolute pressure accuracy of ±1 hPa and a relative accuracy of ±0.12 hPa (equivalent to ±1 meter), making it ideal for altitude tracking.
• Low Power Consumption: Consumes only 2.7 µA at 1 Hz sampling rate, with a sleep mode consumption of 0.1 µA.
• Versatile Interfaces: Supports both I²C (up to 3.4 MHz) and SPI (3 or 4-wire, up to 10 MHz) digital, serial interfaces.
• Compact Design: Housed in an 8-pin metal-lid LGA package measuring just 2.0 x 2.5 x 0.95mm.
• Operating Modes: Features three power modes: sleep mode, forced mode, and normal mode.
• Built-in Filter: Includes an IIR filter to minimize short-term disturbances.

Common Module Pinout (e.g., GY-BMP280):

• VCC/VIN: 3.3V power supply (some breakout boards allow 3-5V).
• GND: Ground.
• SCL/SCK: I2C Clock / SPI Clock.
• SDA/SDI: I2C Data / SPI Data In.
• CSB: Chip Select for SPI (High for I2C).
• SDO: SPI Data Out (Sets I2C address).

Applications:

• Enhancement of GPS navigation: Slope detection, dead-reckoning, time-to-first-fix improvement.
• Indoor Navigation: Floor detection and elevator detection.
• Weather Forecast: Home weather stations.
• Outdoor Navigation: Hiking, cycling, and leisure sports.
• Vertical Velocity Indication: Rise/sink speed.

Note: The BME280 is a similar, but distinct, model that includes humidity sensing in addition to pressure and temperature.