BMP280 Barometric Pressure and Temperature Sensor Module (I2C/SPI)

Overview

The BMP280 is an absolute barometric pressure sensor, which is an upgrade from the older BMP085/BMP180/BMP183. This sensor is specifically designed for mobile applications where size and low power consumption are critical.

Because pressure changes with altitude, and this sensor is so precise, you can use it as an altimeter with ±1 meter accuracy. This makes it an essential component for flight controllers in drones, indoor navigation, and advanced weather monitoring stations.

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Technical Specifications

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Pinout Configuration

The module usually comes with a 6-pin header:

1. VCC: Power Supply (1.8V to 3.6V)
2. GND: Ground
3. SCL: Serial Clock (I2C/SPI)
4. SDA: Serial Data (I2C/SPI)
5. CSB: Chip Select (for SPI mode)
6. SDO: Serial Data Out (for SPI mode / I2C Address select)

💡 Tech Tip: For I2C use, connect the CSB pin to VCC to ensure the module stays in I2C mode. The default I2C address is usually 0x76 or 0x77.

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Why use the BMP280 for your project?

1. Weather Forecasting: Monitor local atmospheric pressure trends to predict rain or clear skies.
2. Altitude Hold: Essential for hobbyist drones and RC planes to maintain a steady hover height.
3. Indoor Navigation: Can detect floor level changes in smart buildings due to its high sensitivity to pressure changes.
4. IoT Ready: Small enough to fit inside a smartwatch or a compact ESP8266-based remote sensor node.

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Standard Applications

• Personal Weather Stations
• GPS Enhancement (Time-to-first-fix improvement)
• Vertical Velocity Indication (Rise/Sink speed)
• Slope detection for fitness tracking