BMP280 Barometric Pressure and Altitude Sensor Module

BMP280 Barometric Pressure and Altitude Sensor Module is a high-precision digital sensing solution designed specifically for mobile applications and environmental monitoring. This module utilizes the advanced Bosch BMP280 sensor, which offers a significantly smaller footprint and lower power consumption than its predecessors. Consequently, it provides engineers with the ability to measure absolute barometric pressure and temperature with remarkable accuracy. By calculating pressure changes, the device also functions as a highly sensitive altimeter, capable of detecting altitude variations within a few centimeters. Furthermore, the module supports both I2C and SPI communication protocols, ensuring seamless integration with microcontrollers like Arduino, ESP32, and Raspberry Pi. Therefore, you can achieve professional-grade environmental sensing in your next project without sacrificing board space or energy efficiency.

Key Features:

• Dual Sensing Capability: The module measures both atmospheric pressure and ambient temperature, providing a comprehensive data set for weather stations and flight controllers.
• High-Resolution Output: It delivers pressure readings with an absolute accuracy of ±1 hPa and temperature readings within ±1.0°C.
• Flexible Communication: Users can easily switch between I2C and SPI interfaces, allowing for versatile wiring configurations depending on the available GPIO pins.
• Low Power Consumption: The sensor draws very little current during active measurements, making it ideal for battery-powered IoT devices and wearables.
• Integrated Altimeter: Because barometric pressure changes with height, this sensor provides precise altitude data for drones and navigation systems.

Technical Specifications:

• Supply Voltage (V_CC): 1.8 V to 3.6 V DC (Module usually includes a 3.3 V regulator)
• Pressure Range: 300 hPa to 1100 hPa (≈ 9000 m to −500 m relative to sea level)
• Temperature Range: −40°C to +85°C
• Interface Support: I2C (up to 3.4 MHz) and SPI (3 and 4 wire, up to 10 MHz)
• Average Current Draw: 2.74 μA (at 1 Hz response rate)
• RMS Noise: 0.2 Pa (equivalent to ≈ 1.7 cm of altitude)

Mechanical Specifications:

• Sensor IC: Bosch BMP280 Digital Pressure Sensor
• PCB Material: High-quality FR-4 with gold-plated pads
• Mounting: 6-pin header for breadboard compatibility or permanent soldering
• Reliability: Robust construction designed to withstand standard industrial environmental conditions.

Dimensions:

• Module Length: ≈ 15.2 mm
• Module Width: ≈ 12.0 mm
• Body Height: ≈ 2.5 mm
• Pin Pitch: 2.54 mm (Standard 0.1 inch)

Pinout and Wiring:

• VCC: Connect to the positive power supply (typically 3.3 V).
• GND: Connect to the common ground of your system.
• SCL: Serial Clock line for both I2C and SPI interfaces.
• SDA: Serial Data line for I2C (or SDI for SPI communication).
• CSB: Chip Select Bus; pull high for I2C or low for SPI activation.
• SDO: Serial Data Out for SPI (or I2C address selection pin).

Datasheet Reference:

• Download Bosch BMP280 Sensor Datasheet

Commonly Used in:

• Arduino Projects: Enthusiasts frequently use this module for building DIY weather monitors and data loggers.
• Drone Flight Controllers: Provides essential altitude hold data for stable hovering and automated landings.
• Handheld Navigators: Enhances GPS accuracy by providing vertical position data.

Applications:

• Weather Forecasting: Tracking pressure trends helps predict upcoming changes in local weather patterns.
• Indoor Navigation: Detecting floor level changes within buildings where GPS signals are weak.
• Sports Devices: Calculating vertical velocity and calorie burn based on elevation changes during hiking or cycling.

Equivalent Models:

• BME280: An upgraded version that includes a humidity sensor in the same package.
• BMP180: The older predecessor, which is larger and less power-efficient, however, it remains popular for basic projects.
• SPL06-001: A high-precision digital barometric pressure sensor that offers similar I2C/SPI functionality.

Package Includes:

• 1 x BMP280 Barometric Pressure and Altitude Sensor Module
• 1 x 6-Pin Straight Header Connector