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
Diff: NvStore/nvstore.h
- Revision:
- 18:c4ac93e01027
- Parent:
- 17:a2c4dd192146
- Child:
- 19:52e19461e867
diff -r a2c4dd192146 -r c4ac93e01027 NvStore/nvstore.h --- a/NvStore/nvstore.h Wed Dec 05 11:27:33 2018 +0000 +++ b/NvStore/nvstore.h Wed Dec 05 11:41:21 2018 +0000 @@ -27,12 +27,22 @@ uint32_t getHumMax(); uint32_t getHumMin(); + void updateVoc(const uint32_t voc); + uint32_t getVocMax(); + uint32_t getVocMin(); + + void updateCo(const uint32_t co); + uint32_t getCoMax(); + uint32_t getCoMin(); + private: MicroBit* _uBit; uint32_t _maxGas, _minGas, _tempMax, _tempMin, _pressMax, _pressMin, - _humMax, _humMin; + _humMax, _humMin, + _vocMax, _vocMin, + _coMax, _coMin; uint32_t getStored(const char* key, const uint32_t defaultVal); void update(const uint32_t value, uint32_t* maxVal, uint32_t* minVal, const char* maxKey, const char* minKey);