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@46:2fed2865a0f3, 2019-02-15 (annotated)

Committer:
jsa1969
Date:
Fri Feb 15 10:55:02 2019 +0000
Revision:
46:2fed2865a0f3
Parent:
44:67a19da5f269 
finally up and running again, next steps: split nvstore into general and app specific functions, split ui from main, more tests

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jsa1969 0:cef60cc92da0 1 #include "i2c_callbacks.h"
jsa1969 0:cef60cc92da0 2
jsa1969 46:2fed2865a0f3 3 I2cCallbacks::I2cCallbacks(MicroBit* uBit){
jsa1969 0:cef60cc92da0 4 _uBit = uBit;
jsa1969 0:cef60cc92da0 5 }
jsa1969 0:cef60cc92da0 6
jsa1969 46:2fed2865a0f3 7 int I2cCallbacks::read(const uint8_t address, const uint8_t reg, uint8_t *buffer, const uint16_t length){
jsa1969 46:2fed2865a0f3 8 if (buffer == NULL || length <= 0)
jsa1969 0:cef60cc92da0 9 return MICROBIT_INVALID_PARAMETER;
jsa1969 42:ce269f988ac8 10
jsa1969 46:2fed2865a0f3 11 int result = _uBit->i2c.write(address, (const char *)&reg, 1, true);
jsa1969 42:ce269f988ac8 12 if (result == 0)
jsa1969 46:2fed2865a0f3 13 result = _uBit->i2c.read(address, (char *)buffer, length);
jsa1969 42:ce269f988ac8 14
jsa1969 42:ce269f988ac8 15 return result != 0 ? MICROBIT_I2C_ERROR : MICROBIT_OK;
jsa1969 0:cef60cc92da0 16 }
jsa1969 0:cef60cc92da0 17
jsa1969 46:2fed2865a0f3 18 int I2cCallbacks::read(const uint8_t address, uint8_t *buffer, const uint16_t length){
jsa1969 46:2fed2865a0f3 19 if (buffer == NULL || length <= 0)
jsa1969 2:544117df8c65 20 return MICROBIT_INVALID_PARAMETER;
jsa1969 44:67a19da5f269 21
jsa1969 46:2fed2865a0f3 22 int result = _uBit->i2c.read(address, (char *)buffer, length);
jsa1969 42:ce269f988ac8 23
jsa1969 2:544117df8c65 24 if (result !=0)
jsa1969 2:544117df8c65 25 return MICROBIT_I2C_ERROR;
jsa1969 2:544117df8c65 26
jsa1969 2:544117df8c65 27 return MICROBIT_OK;
jsa1969 2:544117df8c65 28 }
jsa1969 2:544117df8c65 29
jsa1969 46:2fed2865a0f3 30 int I2cCallbacks::write(const uint8_t dev_id, const uint8_t reg_addr, const uint8_t *data, const uint16_t length){
jsa1969 2:544117df8c65 31 char tmpBuf[length+1];
jsa1969 0:cef60cc92da0 32 tmpBuf[0] = reg_addr;
jsa1969 0:cef60cc92da0 33 for (int i=0,j=1; i <length ; ++i,++j){
jsa1969 0:cef60cc92da0 34 tmpBuf[j] = data[i];
jsa1969 0:cef60cc92da0 35 }
jsa1969 0:cef60cc92da0 36
jsa1969 46:2fed2865a0f3 37 return _uBit->i2c.write(dev_id, tmpBuf, length+1);
jsa1969 0:cef60cc92da0 38 }
jsa1969 0:cef60cc92da0 39
jsa1969 46:2fed2865a0f3 40 int I2cCallbacks::write(const uint8_t dev_id, const uint8_t *data, const uint16_t length){
jsa1969 46:2fed2865a0f3 41 return _uBit->i2c.write(dev_id, (char*)data, length);
jsa1969 42:ce269f988ac8 42 }
jsa1969 42:ce269f988ac8 43
jsa1969 42:ce269f988ac8 44 void I2cCallbacks::delay_ms_relaxed(const uint32_t period) {
jsa1969 42:ce269f988ac8 45 _uBit->sleep(period);
jsa1969 2:544117df8c65 46 }
jsa1969 2:544117df8c65 47
jsa1969 42:ce269f988ac8 48 void I2cCallbacks::delay_ms_strict(const uint32_t period) {
jsa1969 44:67a19da5f269 49 delay_ms_relaxed(period);
jsa1969 46:2fed2865a0f3 50 }