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

i2c/i2c_callbacks.h@44:67a19da5f269, 2019-02-13 (annotated)

Committer:
jsa1969
Date:
Wed Feb 13 20:21:38 2019 +0000
Revision:
44:67a19da5f269
Parent:
42:ce269f988ac8
Child:
46:2fed2865a0f3
more bme tweaking

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jsa1969 0:cef60cc92da0 1 #include "mbed.h"
jsa1969 0:cef60cc92da0 2 #include "MicroBit.h"
jsa1969 0:cef60cc92da0 3
jsa1969 0:cef60cc92da0 4 #ifndef I2C_CALLBACKS_H
jsa1969 0:cef60cc92da0 5 #define I2C_CALLBACKS_H
jsa1969 0:cef60cc92da0 6
jsa1969 0:cef60cc92da0 7 class I2cCallbacks {
jsa1969 0:cef60cc92da0 8 public:
jsa1969 40:a67a880cb538 9 I2cCallbacks(MicroBit* uBit, MicroBitI2C* i2c);
jsa1969 44:67a19da5f269 10 int read(const uint8_t dev_id, const uint8_t reg_addr, uint8_t *data, const uint16_t len, int lock);
jsa1969 44:67a19da5f269 11 int read(const uint8_t dev_id, uint8_t *data, const uint16_t len, int lock);
jsa1969 44:67a19da5f269 12 int write(const uint8_t dev_id, const uint8_t reg_addr, const uint8_t *data, const uint16_t len, int lock);
jsa1969 44:67a19da5f269 13 int write(const uint8_t dev_id, const uint8_t *data, const uint16_t len, int lock);
jsa1969 42:ce269f988ac8 14 void delay_ms_relaxed(const uint32_t period);
jsa1969 42:ce269f988ac8 15 void delay_ms_strict(const uint32_t period);
jsa1969 44:67a19da5f269 16 int acquireLock();
jsa1969 44:67a19da5f269 17 void releaseLock();
jsa1969 0:cef60cc92da0 18
jsa1969 0:cef60cc92da0 19 private:
jsa1969 0:cef60cc92da0 20 MicroBit* _uBit;
jsa1969 40:a67a880cb538 21 MicroBitI2C* _i2c;
jsa1969 44:67a19da5f269 22 int _currentlock;
jsa1969 0:cef60cc92da0 23 };
jsa1969 0:cef60cc92da0 24
jsa1969 0:cef60cc92da0 25 #endif // I2C_CALLBACKS_H