BMP180 Pressure Sensor Module
What Is BMP180?
A digital barometric pressure sensor used to measure atmospheric pressure and temperature.
Based on piezoresistive MEMS technology for accurate pressure sensing.
Commonly used for altitude measurement and weather monitoring.
Key Features
Measures Pressure & Temperature
High Accuracy & Resolution
Digital Output (I2C interface)
Low Power Consumption
Compact and lightweight module
Factory calibrated with internal coefficients
Technical Specifications
Parameter | Value |
Operating Voltage | 3.3 V (some modules in |
Pressure Range | 300 1100 hPa |
Altitude Range | ~0 to 9000 meters |
Temperature Range | 40 C to +85 C |
Pressure Accuracy | 1 hPa (~8 m altitude) |
Resolution | Up to 0.01 hPa |
Interface | I2C (2-wire) |
Pin Configuration
VCC 3.3V (or 5V if module has regulator)
GND Ground
SCL I2C Clock
SDA I2C Data
Some modules also include:
XCLR / EOC pins (rarely used in basic setups)
How It Works
Internal ADC converts pressure and temperature into digital values.
Calibration data stored in the sensor improves accuracy.
Microcontroller reads values via I2C communication.
Altitude is calculated using pressure differences.
Applications
Weather stations
Altitude measurement (drones, GPS assist)
Indoor navigation systems
IoT environmental monitoring
Smart devices (fitness, climbing, etc.)
Altitude Calculation
Altitude is derived from pressure using:
Lower pressure Higher altitude
Formula (simplified):
Altitude function of pressure difference from sea level
Not Waterproof: Must be protected from moisture.
Sensitive to Temperature Changes: Always use temperature compensation.
3.3V Logic: Check module level shifting if using 5V boards.
Better Alternatives: BMP280, BME280 (higher accuracy, humidity support).
Summary
Type: Digital barometric pressure + temperature sensor
Interface: I2C
Use Case: Altitude & weather monitoring
Advantage: High resolution, low power