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

math/MovingAverage.h@34:069c4f6d5b2c, 2019-02-12 (annotated)

Committer:
jsa1969
Date:
Tue Feb 12 15:06:55 2019 +0000
Revision:
34:069c4f6d5b2c
Parent:
33:af2dfab24ca9
Child:
38:0f29a0ea64ca
code cleanup

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jsa1969 33:af2dfab24ca9 1 #ifndef MovingAverage_H
jsa1969 33:af2dfab24ca9 2 #define MovingAverage_H
jsa1969 33:af2dfab24ca9 3
jsa1969 33:af2dfab24ca9 4 #include "mbed.h"
jsa1969 31:3284adaf4804 5
jsa1969 32:2c923405660c 6 class MovingAverage {
jsa1969 31:3284adaf4804 7 public:
jsa1969 33:af2dfab24ca9 8 static const uint32_t INVALID = 0;
jsa1969 33:af2dfab24ca9 9
jsa1969 33:af2dfab24ca9 10 MovingAverage(const unsigned int maxElements);
jsa1969 33:af2dfab24ca9 11 ~MovingAverage();
jsa1969 32:2c923405660c 12 uint32_t average();
jsa1969 31:3284adaf4804 13 void add(const uint32_t value);
jsa1969 33:af2dfab24ca9 14
jsa1969 31:3284adaf4804 15 private:
jsa1969 31:3284adaf4804 16 int _maxElements;
jsa1969 31:3284adaf4804 17 int _currentIndex;
jsa1969 31:3284adaf4804 18 uint32_t* _values;
jsa1969 32:2c923405660c 19 uint32_t currentAverage;
jsa1969 31:3284adaf4804 20 int maxVals;
jsa1969 31:3284adaf4804 21
jsa1969 32:2c923405660c 22 void calcAverage();
jsa1969 31:3284adaf4804 23 };
jsa1969 31:3284adaf4804 24
jsa1969 33:af2dfab24ca9 25 #endif // MovingAverage_H