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--- en:pfw:spi_gd32vf_mecrisp-quintus_bme280 [2023-09-04 18:19] – gelöscht - Externe Bearbeitung (Unbekanntes Datum) 127.0.0.1
+++ en:pfw:spi_gd32vf_mecrisp-quintus_bme280 [2023-09-04 18:20] (current) – ↷ Seite von pfw:spi_gd32vf_mecrisp-quintus_bme280 nach en:pfw:spi_gd32vf_mecrisp-quintus_bme280 verschoben uho
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+{{pfw:banner.png}}
+====== SPI implementation for gd32vf RISCV on mecrisp-quintus for accessing the BME280 humidity sensor ======
+{{https://user-images.githubusercontent.com/64471355/128324729-9aef0436-ee0f-4c95-b3f0-04b9e3c55c77.jpg}}
+I use this little breakout board. Be aware that it comes with seven pads. There are others with 5 or 6 pads. The sensor itself is the tiny silver square with a very tiny hole in the middle of the upper half of the board.\\
+The BME280 is a sensor that measures air humidity, air pressure and temperature. It can be configured to measure in variant speeds and resolutions. The higher the speed the lower the resolution.\\
+The example code shown in BME280.fs was made for an application drawing a carnot diagram of a stirling engine, so it had to be fast. The data was send to a PC where the time consuming calculations were made. If you use it you are able to read out the ID code of the BME280 to test the connection it should be #96 or $60. You will have the calibration data and the ability to read out raw data (pressure, temperature and humidity).\\
+There are other sensor ICs in the world that will show the real values for temperature and pressure without extra calculations but they are somewhat more expensive.
+===== Workflow =====
+  * Load the spixxx.fs code that fits your constraints.
+  * Connect following the wiring in the spixxx.fs code.
+  * Load spixxx.normalization file if any.
+  * Load BME280.fs
+[[https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bme280-ds002.pdf|Datasheet of the BME280]]
+mb