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Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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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.

== Summary ==
Compact environmental sensor by Waveshare with a BME280 chip. Measures temperature, humidity and barometric pressure over I2C or SPI; compatible with 3.3 V/5 V.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL15231 WSAL15231 – BME280 Environmental Sensor, Temperature, Humidity, Barometric Pressure]

== Technical overview ==
* The BME280 measures temperature from -40 to 85 °C (resolution 0.01 °C, accuracy ±1 °C), humidity from 0–100 %RH (resolution 0.008 %RH, accuracy ±3 %RH), and barometric pressure from 300–1100 hPa (resolution 0.18 Pa, accuracy ±1 hPa).
* The module is 27 mm × 20 mm with a 2.0 mm mounting hole.
* Default I2C address is 0x77; grounding the ADDR pin switches it to 0x76.
* Using SPI requires changing the USEIIC macro definition to 0 in the Raspberry Pi, Arduino, and STM32 examples.
* For Raspberry Pi: enable the I2C and SPI drivers via raspi-config, then verify the address with i2cdetect -y 1.
* For Arduino: install the library into the third-party folder, open the bme280test example, and check serial output at 115200 baud.
* For STM32: open the project file, wire according to the interface description, compile, and output via USART2 at 115200 baud.
* The demo uses the official Bosch BME280_driver library; platform-specific read/write and delay functions must be implemented.

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
sudo raspi-config
lsmod
sudo apt-get install i2c-tools
i2cdetect -y 1
sudo make clean
sudo make
sudo ./bme280
</syntaxhighlight>

== Notes and version constraints ==
* Barometer altitude calculations only provide relative values over short periods; for long-term absolute altitude measurement, add GPS.
* If data display is abnormal: check connection, communication mode, and device address.
* The source contains placeholders and incomplete code sections; all steps should be confirmed by a technician before use in a product context.

== Source and revision record ==
* [https://www.waveshare.com/wiki/BME280_Environmental_Sensor BME280 Environmental Sensor - Waveshare Wiki]
* Source revision: 68621
* Captured: 2026-08-31T02:43:59+00:00
* SHA-256: <code>b5b0117407f52116dc99b8d211a09221b7b52dd742bb20e9847d94f67cd117d9</code>

WSAL15231 – BME280 Environmental Sensor/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex