BMP180 Digital Barometric Pressure Sensor Module

BMP180 Digital Barometric Pressure Sensor Module GY-68 is a high-precision, low-power sensing solution designed for measuring atmospheric pressure and temperature with exceptional accuracy. This module utilizes the Bosch Sensortec BMP180 sensor, which provides a digital output via a standard I²C interface. Consequently, it allows for easy integration with popular microcontrollers like Arduino, ESP32, and Raspberry Pi. The device offers a wide measuring range of 300 to 1100 hPa, effectively covering altitudes from 9000 meters above sea level down to 500 meters below. Furthermore, the integrated temperature sensor compensates for thermal drift to ensure stable pressure readings. Therefore, developers often select this module for mobile devices, weather stations, and altitude-tracking projects where space and power efficiency are paramount.

Key Features:

• High-Resolution Sensing: The sensor provides ultra-low noise measurements with an absolute accuracy down to 0.03 hPa in high-resolution mode.
• Integrated Temperature Sensor: An on-chip calibrated sensor measures ambient temperature, which the host system uses for pressure compensation and altitude calculation.
• Low Power Consumption: This module consumes only 3 μA in standard operation, making it perfect for battery-powered remote sensing nodes.
• I²C Digital Interface: The module uses a two-wire serial interface, which simplifies the wiring process and conserves GPIO pins on the host controller.
• Voltage Regulation: Most breakout versions include an onboard 3.3 V regulator and level shifters, ensuring compatibility with both 3.3 V and 5 V logic systems.

Technical Specifications:

• Pressure Range: 300 hPa to 1100 hPa (+9000 m to −500 m relating to sea level)
• Supply Voltage: 1.8 V to 3.6 V (Breakout module typically supports 3.3 V to 5 V)
• Interface: I²C (Standard and Fast Mode supported)
• Sampling Rate: Up to 128 Hz
• Temperature Accuracy: ±1.0 °C (±2.0 °C max)
• Pressure Accuracy: ±0.02 hPa (Advanced Resolution Mode)
• Operating Temperature: −40 °C to +85 °C

Mechanical Specifications:

• Package Type: LGA (Land Grid Array) sensor mounted on a 4-pin or 5-pin breakout PCB.
• PCB Material: High-quality FR4 fiberglass with gold-plated contact pads.
• Mounting Hole: Includes a single M3-sized mounting hole for secure mechanical attachment.
• Weight: ≈ 1.1 g

Dimensions:

• PCB Length: ≈ 13.0 mm
• PCB Width: ≈ 10.5 mm
• Overall 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 or 5 V).
• GND: Connect to the common circuit ground.
• SCL: Serial Clock line for the I²C interface; connect to the SCL pin of the MCU.
• SDA: Serial Data line for the I²C interface; connect to the SDA pin of the MCU.
• Wiring Note: Keep I²C lines as short as possible. However, if you must use long wires, consider adding pull-up resistors to maintain signal integrity.

Datasheet Reference:

• Download Bosch BMP180 Digital Pressure Sensor Datasheet

Commonly Used in:

• Drones and UAVs: Providing accurate altitude hold and vertical speed indication for flight controllers.
• Mobile Handsets: Enhancing GPS accuracy and providing indoor navigation floor detection.
• Hobbyist Projects: Serving as the primary environmental sensor in Arduino-based DIY weather stations.

Applications:

• Weather Forecasting: Monitoring barometric trends to predict local weather changes.
• Altimeters: Calculating precise altitude based on pressure variations for hiking and sports watches.
• Vertical Velocity Indication: Measuring the rate of climb or sink in glider or parachute instrumentation.
• Power Efficiency: Assisting in fan control for HVAC systems based on local pressure gradients.

Equivalent Models:

• BMP085: The direct predecessor to the BMP180, which is functionally compatible with the same software libraries.
• BMP280: A next-generation sensor offering even lower power consumption and both I²C and SPI communication.
• BME280: A highly advanced version that adds relative humidity sensing to the pressure and temperature capabilities.

Package Includes:

• 1 x BMP180 Digital Barometric Pressure Sensor Module
• 1 x 4-Pin Male Header Strip