BMP180

📦 BMP180 Sensor — Product Description

The BMP180 is a compact, digital barometric pressure sensor developed by Bosch Sensortec. It’s designed to measure atmospheric pressure, temperature, and (by calculation) altitude with high precision and ultra-low power consumption. The sensor communicates over a simple I²C interface, making it extremely easy to integrate into microcontroller projects for weather stations, drones, altimeters, GPS enhancement, and environmental sensing.

👉 Typical users include hobbyists and engineers working on:

Weather monitoring devices 🌦

Altitude sensing (e.g., drones, wearables) 🛩️

Indoor navigation and GPS boosting 🛰️

Portable embedded systems requiring low power draw 🔋

Most BMP180 modules include an onboard voltage regulator and I²C pull-ups, allowing use with 3.3 V or 5 V microcontroller systems (like Arduino).

📊 Key Specifications (Sensor Chip)
Parameter Specification
Pressure Range 300 hPa to 1100 hPa (–500 m to +9000 m relative to sea level)
Pressure Resolution ~0.02 hPa (≈ 0.17 m altitude) in high-resolution mode
Pressure Accuracy Typically ±0.12 hPa (~±1 m)
Temperature Range −40 °C to +85 °C
Temperature Measurement Included (used for pressure compensation)
Temperature Resolution ~0.1 °C (varies with mode)
Interface I²C digital interface (address 0x77)
Supply Voltage (Chip) 1.8 V – 3.6 V (VDD) / 1.62 V – 3.6 V (VDDIO)
Power Consumption ~3 µA at 1 Hz (standard mode); much lower standby
Noise ~0.06 hPa (low-power mode)
Package Dimensions ~3.6 mm × 3.8 mm × 0.93 mm (LGA package)
🧩 Typical Module Features (Mounted Breakout Board)

Most breakout boards you’ll find (e.g., GY-68) add these conveniences:

✔ On-board voltage regulator – run from 3.3 V or 5 V
✔ I²C pull-up resistors – no need to add external ones
✔ Breadboard-friendly pins (VCC, GND, SDA, SCL)
✔ Fully calibrated sensor chip from Bosch

📏 Typical module size is around 20 mm × 15 mm (varies by vendor).