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.cpp@40:a67a880cb538, 2019-02-13 (annotated)

Committer:
jsa1969
Date:
Wed Feb 13 08:04:22 2019 +0000
Revision:
40:a67a880cb538
Parent:
15:8bb5c580d453
Child:
42:ce269f988ac8
for the moment: seperate the i2c busses of the chips and remove all locking

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jsa1969 0:cef60cc92da0 1 #include "i2c_callbacks.h"
jsa1969 0:cef60cc92da0 2
jsa1969 40:a67a880cb538 3 I2cCallbacks::I2cCallbacks(MicroBit* uBit, MicroBitI2C* i2c){
jsa1969 0:cef60cc92da0 4 _uBit = uBit;
jsa1969 40:a67a880cb538 5 if (i2c == NULL) {
jsa1969 40:a67a880cb538 6 _i2c = &(_uBit->i2c);
jsa1969 40:a67a880cb538 7 }
jsa1969 40:a67a880cb538 8 else {
jsa1969 40:a67a880cb538 9 _i2c = i2c;
jsa1969 40:a67a880cb538 10 }
jsa1969 0:cef60cc92da0 11 }
jsa1969 0:cef60cc92da0 12
jsa1969 15:8bb5c580d453 13 int I2cCallbacks::read(const uint8_t address, const uint8_t reg, uint8_t *buffer, const uint16_t length){
jsa1969 0:cef60cc92da0 14 int result;
jsa1969 0:cef60cc92da0 15
jsa1969 0:cef60cc92da0 16 if (buffer == NULL || length <= 0)
jsa1969 0:cef60cc92da0 17 return MICROBIT_INVALID_PARAMETER;
jsa1969 0:cef60cc92da0 18
jsa1969 40:a67a880cb538 19 result = _i2c->write(address, (const char *)&reg, 1, true);
jsa1969 0:cef60cc92da0 20 if (result !=0)
jsa1969 0:cef60cc92da0 21 return MICROBIT_I2C_ERROR;
jsa1969 0:cef60cc92da0 22
jsa1969 40:a67a880cb538 23 result = _i2c->read(address, (char *)buffer, length);
jsa1969 0:cef60cc92da0 24 if (result !=0)
jsa1969 0:cef60cc92da0 25 return MICROBIT_I2C_ERROR;
jsa1969 0:cef60cc92da0 26
jsa1969 0:cef60cc92da0 27 return MICROBIT_OK;
jsa1969 0:cef60cc92da0 28 }
jsa1969 0:cef60cc92da0 29
jsa1969 15:8bb5c580d453 30 int I2cCallbacks::read(const uint8_t address, uint8_t *buffer, const uint16_t length){
jsa1969 2:544117df8c65 31 int result;
jsa1969 2:544117df8c65 32
jsa1969 2:544117df8c65 33 if (buffer == NULL || length <= 0)
jsa1969 2:544117df8c65 34 return MICROBIT_INVALID_PARAMETER;
jsa1969 2:544117df8c65 35
jsa1969 40:a67a880cb538 36 result = _i2c->read(address, (char *)buffer, length);
jsa1969 2:544117df8c65 37 if (result !=0)
jsa1969 2:544117df8c65 38 return MICROBIT_I2C_ERROR;
jsa1969 2:544117df8c65 39
jsa1969 2:544117df8c65 40 return MICROBIT_OK;
jsa1969 2:544117df8c65 41 }
jsa1969 2:544117df8c65 42
jsa1969 15:8bb5c580d453 43 int I2cCallbacks::write(const uint8_t dev_id, const uint8_t reg_addr, const uint8_t *data, const uint16_t length){
jsa1969 2:544117df8c65 44 char tmpBuf[length+1];
jsa1969 0:cef60cc92da0 45 tmpBuf[0] = reg_addr;
jsa1969 0:cef60cc92da0 46 for (int i=0,j=1; i <length ; ++i,++j){
jsa1969 0:cef60cc92da0 47 tmpBuf[j] = data[i];
jsa1969 0:cef60cc92da0 48 }
jsa1969 0:cef60cc92da0 49
jsa1969 40:a67a880cb538 50 return _i2c->write(dev_id, tmpBuf, length+1);
jsa1969 0:cef60cc92da0 51 }
jsa1969 0:cef60cc92da0 52
jsa1969 15:8bb5c580d453 53 int I2cCallbacks::write(const uint8_t dev_id, const uint8_t *data, const uint16_t length){
jsa1969 40:a67a880cb538 54 return _i2c->write(dev_id, (char*)data, length);
jsa1969 2:544117df8c65 55 }
jsa1969 2:544117df8c65 56
jsa1969 15:8bb5c580d453 57 void I2cCallbacks::delay_ms(const uint32_t period) {
jsa1969 0:cef60cc92da0 58 _uBit->sleep(period);
jsa1969 0:cef60cc92da0 59 }