uses BBC micro:bit to measure and display indoor air quality using Bosch BME680 and/or Sensirion SGP30
uses Bosch BME680 and/or Sensirion SGP30 sensors to measure indor air quality
sensors should be connected to BBC micro:bit using i2c
commands are received and data is being sent using uBit / nordic radio protocol
display
---
last line always indicates: - first dot: bme680 detected - second dot: sgp30 detected - third dot: sgp 30 setting humidity/temperature - fourth dor: sgp30 measuring - fith dot: bme680 measuring
the detect dots should be in a stable state (not blinking) the measuring dots should be blinking (constant light means: measurement failed)
if only one bme680 is present: - first 3 lines indicate gas resistence (air quality / more dots == worse quality) - fourth line indicates humidity level
if only sgp30 is present: - first two lines indicate SGP30 VOC level - third and fourth line indicate sgp30 CO2 level
if both sensors are present: - first line indicates SGP30 VOC level - second line line indicates sgp30 CO2 level - third line indicates bme680 gas resistence (air quality) - fourth line indicates bme 680 humidity level
buttons
-
B display state, switches betweeen
- full bright
- low light
- display off
AB reset sgp30 baseline in non volatile storage
data logging
--
during measurements the minimum and mximum values for each measured value
(temperature, air pressure, humidity,gas resistance, VOC, CO2)
are being stored in non volatile storage
those (and the last measurement results) are being shown when btn A has been pressed
SGP30/sgp30.h
- Committer:
- jsa1969
- Date:
- 2022-01-20
- Revision:
- 52:112eaa5282c6
- Parent:
- 49:bbb506b58e6e
File content as of revision 52:112eaa5282c6:
#include "mbed.h" #include "MicroBit.h" #include "i2c_callbacks.h" #ifndef SGP30_H #define SGP30_H /* the code has been taken from https://github.com/adafruit/Adafruit_SGP30 Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit! The original code has been written by Limor Fried for Adafruit Industries and only been slightly adjusted by me for mbed MicroBit compatibility */ class Sgp30 { public: Sgp30(I2cCallbacks *callbacks); bool begin(); bool IAQmeasure(); bool IAQmeasureRaw(); bool test(); bool setHumidity(const uint32_t rel_humidity, const uint32_t temperature); bool getIAQBaseline(uint16_t *eco2_base, uint16_t *tvoc_base); bool setIAQBaseline(uint16_t eco2_base, uint16_t tvoc_base); uint16_t TVOC; uint16_t eCO2; uint16_t rawH2; uint16_t rawEthanol; uint16_t serialnumber[3]; private: I2cCallbacks *_callbacks; uint8_t _i2caddr; uint32_t _absolute_humidity; bool IAQinit(); bool setHumidity(const uint32_t absolute_humidity); //void write(uint8_t address, uint8_t *data, uint8_t n); //void read(uint8_t address, uint8_t *data, uint8_t n); bool readWordFromCommand(const uint8_t command[], const uint8_t commandLength, const uint16_t delay, uint16_t *readdata = NULL, const uint8_t readlen = 0); uint8_t generateCRC(const uint8_t data[], const uint8_t datalen); }; #endif // SGP30_H