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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.<br />
<br />
== Summary ==<br />
The BMP390 is a 24-bit sensor for barometric pressure, altitude, and temperature. It supports I2C and SPI, operates at 3.3 V or 5 V, and suits altimetry, environmental monitoring, and IoT projects.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL24658 WSAL24658 – BMP390 High Precision Barometric Pressure Sensor, Barometric Pressure / Altitude / Temperature Measuring]<br />
<br />
== Technical overview ==<br />
* Key specifications: measurement range 300–1250 hPa; absolute accuracy ±0.50 hPa (300–1100 hPa, 0–65 °C); relative accuracy ±0.03 hPa (700–1100 hPa, 25–40 °C).<br />
* Resolution: 0.016 Pa in high-precision mode; sampling rate up to 200 Hz; average operating current ≈3.2 µA at 1 Hz.<br />
* Interfaces: I2C (default address 0x77, alternative 0x76 via solder bridge) and SPI; INT pin for interrupts; onboard voltage translator supports 3.3 V/5 V operation.<br />
* Raspberry Pi: I2C connects to SDA/SCL; SPI connects to MISO/MOSI/SCLK/CS (pin 27 for CS).<br />
* Arduino: I2C connects to SDA/SCL; SPI uses pins 12 (MISO), 11 (MOSI), 13 (SCK), 10 (SS).<br />
* ESP32: I2C uses pin 13 (SDA) and 14 (SCL); SPI uses pins 10 (MISO), 11 (MOSI), 9 (SCK), 12 (SS).<br />
* Raspberry Pi Pico: I2C connects to GP2 (SDA) and GP3 (SCL); requires MicroPython firmware; demo scripts are loaded via Thonny.<br />
* Altitude is derived from air pressure; relative altitude accuracy is approximately ±3 Pa, equivalent to ±0.25 m.<br />
* Module dimensions: 32 mm × 20 mm; via-hole diameter 2.0 mm; operating temperature range −40 to 85 °C.<br />
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'''Commands and examples – verify before use:''' <br />
<syntaxhighlight lang="text"><br />
sudo apt-get install wiringpi<br />
sudo raspi-config<br />
i2cdetect -y 1<br />
make clean && make<br />
sudo ./bmp3<br />
</syntaxhighlight><br />
<br />
== Notes and version constraints ==<br />
* I2C address depends on the solder bridge: 0x77 without resistor, 0x76 with a soldered 0Ω resistor. Do not solder this resistor when using SPI mode.<br />
* Altitude values are relative and may drift over extended periods; add GPS for long-term, high-frequency altitude accuracy.<br />
* If serial monitor data (115200 baud) does not display: check connections, communication method, and device address.<br />
* MicroPython firmware must be installed on the Pico before running demos; offline installation involves dragging a .uf2 file into the USB drive.<br />
* Exact pin mappings may vary by development board variant; the listed pins match the examples shown in the document (e.g., ESP32-S3-DEV-KIT-N8R8).<br />
<br />
== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/BMP390_Barometric_Pressure_Sensor BMP390 Barometric Pressure Sensor - Waveshare Wiki]<br />
* Source revision: 99682<br />
* Captured: 2026-09-05T02:36:52+00:00<br />
* SHA-256: <code>80be48ddd41a3d73b7d2b9280096f9bc75eb923b6238af6aa8247c562e1ff40e</code></div>JWTechPublisher