Jens Schmidt / MicrobitIAQ

uses BBC micro:bit to measure and display indoor air quality using Bosch BME680 and/or Sensirion SGP30

Dependencies:   microbit

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@16:3a4b9a3ef2bb, 2018-12-05 (annotated)

Committer:
jsa1969
Date:
Wed Dec 05 11:05:00 2018 +0000
Revision:
16:3a4b9a3ef2bb
Parent:
15:8bb5c580d453
Child:
22:5a8bec9862db
mention GitHub sources for bme680 and sgp30 code

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jsa1969 2:544117df8c65 1 #include "mbed.h"
jsa1969 2:544117df8c65 2 #include "MicroBit.h"
jsa1969 2:544117df8c65 3
jsa1969 2:544117df8c65 4 #include "i2c_callbacks.h"
jsa1969 2:544117df8c65 5
jsa1969 2:544117df8c65 6 #ifndef SGP30_H
jsa1969 2:544117df8c65 7 #define SGP30_H
jsa1969 2:544117df8c65 8
jsa1969 16:3a4b9a3ef2bb 9 /*
jsa1969 16:3a4b9a3ef2bb 10 the code has been taken from https://github.com/adafruit/Adafruit_SGP30
jsa1969 16:3a4b9a3ef2bb 11 and only been slightly adjusted for mbed MicroBit
jsa1969 16:3a4b9a3ef2bb 12 */
jsa1969 16:3a4b9a3ef2bb 13
jsa1969 2:544117df8c65 14
jsa1969 2:544117df8c65 15 class Sgp30 {
jsa1969 2:544117df8c65 16 public:
jsa1969 2:544117df8c65 17 Sgp30(I2cCallbacks *callbacks);
jsa1969 2:544117df8c65 18 bool begin();
jsa1969 15:8bb5c580d453 19 bool IAQmeasure();
jsa1969 15:8bb5c580d453 20 bool test();
jsa1969 15:8bb5c580d453 21 bool setHumidity(const uint32_t rel_humidity, const uint32_t temperature);
jsa1969 2:544117df8c65 22
jsa1969 2:544117df8c65 23 uint16_t TVOC;
jsa1969 2:544117df8c65 24 uint16_t eCO2;
jsa1969 2:544117df8c65 25
jsa1969 2:544117df8c65 26 uint16_t serialnumber[3];
jsa1969 2:544117df8c65 27
jsa1969 2:544117df8c65 28 private:
jsa1969 2:544117df8c65 29 I2cCallbacks *_callbacks;
jsa1969 2:544117df8c65 30 uint8_t _i2caddr;
jsa1969 2:544117df8c65 31 uint32_t _absolute_humidity;
jsa1969 2:544117df8c65 32
jsa1969 15:8bb5c580d453 33 bool IAQinit();
jsa1969 15:8bb5c580d453 34 bool setHumidity(const uint32_t absolute_humidity);
jsa1969 2:544117df8c65 35 //void write(uint8_t address, uint8_t *data, uint8_t n);
jsa1969 2:544117df8c65 36 //void read(uint8_t address, uint8_t *data, uint8_t n);
jsa1969 15:8bb5c580d453 37 bool readWordFromCommand(const uint8_t command[], const uint8_t commandLength, const uint16_t delay, uint16_t *readdata = NULL, const uint8_t readlen = 0);
jsa1969 15:8bb5c580d453 38 uint8_t generateCRC(const uint8_t data[], const uint8_t datalen);
jsa1969 2:544117df8c65 39
jsa1969 2:544117df8c65 40 };
jsa1969 2:544117df8c65 41
jsa1969 2:544117df8c65 42 #endif // SGP30_H