Description
Product Overview
The GY-65 BMP085 Barometric Pressure Sensor Module is a high-precision, ultra-low power digital pressure and temperature sensor module designed for altitude measurement, weather monitoring, and GPS navigation applications. Based on the Bosch BMP085 sensor chip, this module provides accurate absolute pressure readings (300 to 1100 hPa) and can calculate altitude with a resolution as fine as 0.25 meters in high-resolution mode .
The BMP085 sensor integrates a high-linearity pressure sensor with a 16-bit ΣΔ ADC (Analog-to-Digital Converter), a factory-calibrated temperature sensor, and a control unit with E²PROM. It is factory-calibrated with 11 coefficients stored in its internal memory, eliminating the need for user calibration and ensuring consistent, reliable readings out of the box .
What sets the GY-65 apart is its combination of high precision and ultra-low power consumption. With active current as low as 5 µA in standard mode and standby current of just 0.1 µA, it is perfectly suited for battery-powered portable devices . The sensor operates over a wide pressure range covering altitudes from below sea level up to approximately 9,000 meters (30,000 feet).
The GY-65 breakout board includes all necessary support components and communicates via the I²C interface, making it compatible with a vast range of microcontrollers, including Arduino, ESP32, ESP8266, STM32, and Raspberry Pi. The module is 3.3V and 5V compatible, allowing direct connection to most development boards without level shifters .
Key Features
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High-Precision Pressure Sensing: Pressure range of 300 to 1100 hPa, covering altitudes from -500 meters to +9,000 meters .
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Exceptional Resolution: Ultra-high resolution mode achieves 0.03 hPa accuracy, translating to altitude resolution of approximately 0.25 meters (8 inches) .
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Integrated Temperature Sensor: Built-in temperature output with factory calibration for accurate thermal compensation of pressure readings .
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Ultra-Low Power Consumption: Active current of 5 µA in standard mode, standby current of 0.1 µA – ideal for battery-powered IoT devices .
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I²C Digital Interface: Simple 2-wire communication (SDA, SCL) with standard I²C protocol .
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Wide Voltage Compatibility: Operates on 3.3V or 5V power, compatible with both 3.3V and 5V logic systems .
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Factory Calibrated: 11 calibration coefficients stored in internal E²PROM ensure accurate readings without user calibration .
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Fast Response Time: 7.5 ms conversion time for pressure and temperature readings .
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Temperature Compensation: Built-in temperature sensor automatically compensates pressure readings for ambient temperature variations .
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Compact Form Factor: Small module size easy to integrate into space-constrained projects .
Technical Specifications
| Parameter | Operating Value |
|---|---|
| Sensor Chip | Bosch BMP085 |
| Pressure Range | 300 – 1100 hPa (altitude: -500m to +9,000m) |
| Pressure Accuracy (Standard Mode) | 0.06 hPa (0.5 meter altitude resolution) |
| Pressure Accuracy (Ultra-High Res Mode) | 0.03 hPa (0.25 meter altitude resolution) |
| Temperature Range | -40°C to +85°C |
| Temperature Accuracy | ±0.5°C (typical) |
| Supply Voltage (VCC) | 3.3V – 5V DC (module level) |
| Core Voltage (VDDA) | 1.8V – 3.6V |
| Digital I/O Voltage (VDDD) | 1.62V – 3.6V |
| Active Current | 5 µA (standard mode) |
| Standby Current | 0.1 µA |
| Communication Protocol | I²C (100 kHz / 400 kHz) |
| Conversion Time | 7.5 ms (typical) |
| Module Dimensions | Approx. 13mm × 11mm × 4mm |
| Operating Temperature | -40°C to +85°C |
| Pin Count | 6 pins (VCC, GND, SCL, SDA, XCLR, EOC) |
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