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

main.cpp@18:c4ac93e01027, 2018-12-05 (annotated)

Committer:
jsa1969
Date:
Wed Dec 05 11:41:21 2018 +0000
Revision:
18:c4ac93e01027
Parent:
17:a2c4dd192146
Child:
19:52e19461e867
data logging for sgp30

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jsa1969 0:cef60cc92da0 1 /*
jsa1969 0:cef60cc92da0 2 The MIT License (MIT)
jsa1969 0:cef60cc92da0 3
jsa1969 0:cef60cc92da0 4 Copyright (c) 2016 British Broadcasting Corporation.
jsa1969 0:cef60cc92da0 5 This software is provided by Lancaster University by arrangement with the BBC.
jsa1969 0:cef60cc92da0 6
jsa1969 0:cef60cc92da0 7 Permission is hereby granted, free of charge, to any person obtaining a
jsa1969 0:cef60cc92da0 8 copy of this software and associated documentation files (the "Software"),
jsa1969 0:cef60cc92da0 9 to deal in the Software without restriction, including without limitation
jsa1969 0:cef60cc92da0 10 the rights to use, copy, modify, merge, publish, distribute, sublicense,
jsa1969 0:cef60cc92da0 11 and/or sell copies of the Software, and to permit persons to whom the
jsa1969 0:cef60cc92da0 12 Software is furnished to do so, subject to the following conditions:
jsa1969 0:cef60cc92da0 13
jsa1969 0:cef60cc92da0 14 The above copyright notice and this permission notice shall be included in
jsa1969 0:cef60cc92da0 15 all copies or substantial portions of the Software.
jsa1969 0:cef60cc92da0 16
jsa1969 0:cef60cc92da0 17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
jsa1969 0:cef60cc92da0 18 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
jsa1969 0:cef60cc92da0 19 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
jsa1969 0:cef60cc92da0 20 THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
jsa1969 0:cef60cc92da0 21 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
jsa1969 0:cef60cc92da0 22 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
jsa1969 0:cef60cc92da0 23 DEALINGS IN THE SOFTWARE.
jsa1969 0:cef60cc92da0 24 */
jsa1969 0:cef60cc92da0 25
jsa1969 0:cef60cc92da0 26 #include "MicroBit.h"
jsa1969 0:cef60cc92da0 27
jsa1969 0:cef60cc92da0 28 #include "bme680.h"
jsa1969 2:544117df8c65 29 #include "sgp30.h"
jsa1969 2:544117df8c65 30 #include "dotmath.h"
jsa1969 11:6844a5578b4f 31 #include "nvstore.h"
jsa1969 2:544117df8c65 32
jsa1969 1:f9245fb53737 33 #include "physics.h"
jsa1969 0:cef60cc92da0 34
jsa1969 0:cef60cc92da0 35 MicroBit uBit;
jsa1969 2:544117df8c65 36 Bme680* bme680 = NULL;
jsa1969 2:544117df8c65 37 struct bme680_field_data* bme680Data = NULL;
jsa1969 2:544117df8c65 38 Sgp30* sgp30 = NULL;
jsa1969 12:96eb06e837f4 39 I2cCallbacks* callbacks = NULL;
jsa1969 12:96eb06e837f4 40 NvStore* nvStore = NULL;
jsa1969 12:96eb06e837f4 41
jsa1969 12:96eb06e837f4 42 bool cancelMeasureLoops = false;
jsa1969 12:96eb06e837f4 43 int runningLoops = 0;
jsa1969 0:cef60cc92da0 44
jsa1969 12:96eb06e837f4 45 void waitForLooppsToFinish() {
jsa1969 12:96eb06e837f4 46 cancelMeasureLoops=true;
jsa1969 12:96eb06e837f4 47 while (runningLoops>0) {
jsa1969 12:96eb06e837f4 48 uBit.sleep(10);
jsa1969 12:96eb06e837f4 49 }
jsa1969 12:96eb06e837f4 50 cancelMeasureLoops = false;
jsa1969 12:96eb06e837f4 51 }
jsa1969 0:cef60cc92da0 52
jsa1969 11:6844a5578b4f 53 void displayPixels(int ystart, int pixels, int maxpixels) {
jsa1969 11:6844a5578b4f 54 int y = ystart;
jsa1969 11:6844a5578b4f 55 for (int i=0; i+((y-ystart)*5)<maxpixels; ++i) {
jsa1969 11:6844a5578b4f 56 if (i==5) {
jsa1969 11:6844a5578b4f 57 ++y;
jsa1969 11:6844a5578b4f 58 i=0;
jsa1969 11:6844a5578b4f 59 }
jsa1969 11:6844a5578b4f 60 int pixelsused = i+((y-ystart)*5);
jsa1969 11:6844a5578b4f 61 uBit.display.image.setPixelValue(i, y, pixelsused<pixels? 255 : 0);
jsa1969 10:8e6b71a46871 62 }
jsa1969 10:8e6b71a46871 63 }
jsa1969 10:8e6b71a46871 64
jsa1969 1:f9245fb53737 65 int measureBme680(){
jsa1969 1:f9245fb53737 66 if (bme680!=NULL && bme680Data!=NULL) {
jsa1969 1:f9245fb53737 67 return bme680->measure(
jsa1969 1:f9245fb53737 68 bme680Data,
jsa1969 2:544117df8c65 69 bme680Data->temperature==0 ?
jsa1969 2:544117df8c65 70 uBit.thermometer.getTemperature()
jsa1969 2:544117df8c65 71 :bme680Data->temperature,
jsa1969 12:96eb06e837f4 72 2000, 250);
jsa1969 1:f9245fb53737 73 } else {
jsa1969 1:f9245fb53737 74 return BME680_E_DEV_NOT_FOUND;
jsa1969 1:f9245fb53737 75 }
jsa1969 0:cef60cc92da0 76 }
jsa1969 0:cef60cc92da0 77
jsa1969 11:6844a5578b4f 78 void measureAndDisplayBme680() {
jsa1969 11:6844a5578b4f 79 if (bme680!=NULL) {
jsa1969 11:6844a5578b4f 80 uBit.display.image.setPixelValue(4, 4, 255);
jsa1969 11:6844a5578b4f 81 if (measureBme680()==MICROBIT_OK) {
jsa1969 14:71060505061e 82 nvStore->updateGas(bme680Data->gas_resistance);
jsa1969 17:a2c4dd192146 83 nvStore->updateTemp(bme680Data->temperature);
jsa1969 17:a2c4dd192146 84 nvStore->updatePress(bme680Data->pressure);
jsa1969 17:a2c4dd192146 85 nvStore->updateHumidity(bme680Data->humidity);
jsa1969 17:a2c4dd192146 86
jsa1969 14:71060505061e 87 uBit.display.image.setPixelValue(0, 4, 255);
jsa1969 11:6844a5578b4f 88 uBit.display.image.setPixelValue(4, 4, 0);
jsa1969 11:6844a5578b4f 89 int bmeY = sgp30!=NULL ? 2 : 0;
jsa1969 11:6844a5578b4f 90 int bmeMaxPixels = sgp30!=NULL ? 5 : 15;
jsa1969 14:71060505061e 91 displayPixels(bmeY, DotMath::pixels(bme680Data->gas_resistance, nvStore->getGasMax(), bmeMaxPixels),
jsa1969 11:6844a5578b4f 92 bmeMaxPixels);
jsa1969 11:6844a5578b4f 93 displayPixels(3, 5*bme680Data->humidity/100000, 5);
jsa1969 14:71060505061e 94 } else {
jsa1969 14:71060505061e 95 uBit.display.image.setPixelValue(0, 4, 0);
jsa1969 2:544117df8c65 96 }
jsa1969 12:96eb06e837f4 97 uBit.display.image.setPixelValue(4, 4, 0);
jsa1969 11:6844a5578b4f 98 }
jsa1969 11:6844a5578b4f 99 }
jsa1969 11:6844a5578b4f 100
jsa1969 11:6844a5578b4f 101 void measureAndDisplaySgp30() {
jsa1969 11:6844a5578b4f 102 if (sgp30!=NULL) {
jsa1969 11:6844a5578b4f 103 int sgpMaxPixels = 10;
jsa1969 11:6844a5578b4f 104 int secondLineStart = 2;
jsa1969 11:6844a5578b4f 105 if (bme680!=NULL) {
jsa1969 11:6844a5578b4f 106 sgpMaxPixels = 5;
jsa1969 11:6844a5578b4f 107 secondLineStart = 1;
jsa1969 11:6844a5578b4f 108 uBit.display.image.setPixelValue(2, 4, 255);
jsa1969 11:6844a5578b4f 109 if (sgp30->setHumidity(bme680Data->humidity, bme680Data->temperature)) {
jsa1969 11:6844a5578b4f 110 uBit.display.image.setPixelValue(2, 4, 0);
jsa1969 11:6844a5578b4f 111 }
jsa1969 11:6844a5578b4f 112 uBit.sleep(10);
jsa1969 11:6844a5578b4f 113 }
jsa1969 11:6844a5578b4f 114 uBit.display.image.setPixelValue(3, 4, 255);
jsa1969 11:6844a5578b4f 115 if (sgp30->IAQmeasure()) {
jsa1969 13:996026828be7 116 uBit.display.image.setPixelValue(1, 4, 255);
jsa1969 11:6844a5578b4f 117 uBit.display.image.setPixelValue(3, 4, 0);
jsa1969 18:c4ac93e01027 118
jsa1969 18:c4ac93e01027 119 nvStore->updateVoc(sgp30->TVOC);
jsa1969 18:c4ac93e01027 120 nvStore->updateCo(sgp30->eCO2);
jsa1969 18:c4ac93e01027 121
jsa1969 12:96eb06e837f4 122 int co2Dots = min (5, sgp30->eCO2 /1500);
jsa1969 11:6844a5578b4f 123 displayPixels(0, 5 - DotMath::pixels(sgp30->TVOC, 20000, sgpMaxPixels), sgpMaxPixels);
jsa1969 11:6844a5578b4f 124 displayPixels(secondLineStart, co2Dots, sgpMaxPixels);
jsa1969 13:996026828be7 125 } else {
jsa1969 13:996026828be7 126 uBit.display.image.setPixelValue(1, 4, 0);
jsa1969 11:6844a5578b4f 127 }
jsa1969 2:544117df8c65 128 }
jsa1969 2:544117df8c65 129 }
jsa1969 2:544117df8c65 130
jsa1969 12:96eb06e837f4 131 void bmeMeasureLoop() {
jsa1969 12:96eb06e837f4 132 if (bme680!=NULL) {
jsa1969 12:96eb06e837f4 133 ++runningLoops;
jsa1969 12:96eb06e837f4 134 while (!cancelMeasureLoops){
jsa1969 11:6844a5578b4f 135 measureAndDisplayBme680();
jsa1969 13:996026828be7 136 uBit.sleep(500);
jsa1969 12:96eb06e837f4 137 }
jsa1969 12:96eb06e837f4 138 --runningLoops;
jsa1969 12:96eb06e837f4 139 }
jsa1969 12:96eb06e837f4 140 }
jsa1969 12:96eb06e837f4 141
jsa1969 12:96eb06e837f4 142 void sgpMeasureLoop() {
jsa1969 12:96eb06e837f4 143 if (sgp30!=NULL) {
jsa1969 12:96eb06e837f4 144 ++runningLoops;
jsa1969 12:96eb06e837f4 145 while (!cancelMeasureLoops){
jsa1969 11:6844a5578b4f 146 measureAndDisplaySgp30();
jsa1969 12:96eb06e837f4 147 uBit.sleep(950);
jsa1969 2:544117df8c65 148 }
jsa1969 12:96eb06e837f4 149 --runningLoops;
jsa1969 2:544117df8c65 150 }
jsa1969 12:96eb06e837f4 151 }
jsa1969 12:96eb06e837f4 152
jsa1969 12:96eb06e837f4 153 void startLoops() {
jsa1969 12:96eb06e837f4 154 if (runningLoops>0) {
jsa1969 12:96eb06e837f4 155 uBit.display.scroll("already running");
jsa1969 12:96eb06e837f4 156 return;
jsa1969 12:96eb06e837f4 157 }
jsa1969 14:71060505061e 158 create_fiber(sgpMeasureLoop);
jsa1969 12:96eb06e837f4 159 create_fiber(bmeMeasureLoop);
jsa1969 2:544117df8c65 160 }
jsa1969 2:544117df8c65 161
jsa1969 11:6844a5578b4f 162 void init680(){
jsa1969 9:5150afa50eb6 163 if (bme680!=NULL){
jsa1969 9:5150afa50eb6 164 delete bme680;
jsa1969 9:5150afa50eb6 165 }
jsa1969 10:8e6b71a46871 166
jsa1969 14:71060505061e 167 uint32_t gasMax = nvStore->getGasMax();
jsa1969 11:6844a5578b4f 168 if (gasMax>0) {
jsa1969 11:6844a5578b4f 169 uBit.display.scroll((int)gasMax);
jsa1969 11:6844a5578b4f 170 }
jsa1969 10:8e6b71a46871 171
jsa1969 14:71060505061e 172 bme680 = new Bme680(callbacks);
jsa1969 9:5150afa50eb6 173 int code = bme680->init();
jsa1969 9:5150afa50eb6 174 if (code == MICROBIT_OK){
jsa1969 9:5150afa50eb6 175 if (bme680Data==NULL) {
jsa1969 9:5150afa50eb6 176 bme680Data = new struct bme680_field_data;
jsa1969 9:5150afa50eb6 177 }
jsa1969 9:5150afa50eb6 178 code = bme680->measure(
jsa1969 9:5150afa50eb6 179 bme680Data,
jsa1969 9:5150afa50eb6 180 uBit.thermometer.getTemperature(),
jsa1969 9:5150afa50eb6 181 100, 100);
jsa1969 9:5150afa50eb6 182 }
jsa1969 9:5150afa50eb6 183 if (code != MICROBIT_OK){
jsa1969 9:5150afa50eb6 184 delete bme680;
jsa1969 9:5150afa50eb6 185 bme680 = NULL;
jsa1969 9:5150afa50eb6 186 delete bme680Data;
jsa1969 9:5150afa50eb6 187 bme680Data = NULL;
jsa1969 9:5150afa50eb6 188 uBit.display.scroll(code);
jsa1969 9:5150afa50eb6 189 } else {
jsa1969 9:5150afa50eb6 190 uBit.display.image.setPixelValue(0, 4, 255);
jsa1969 9:5150afa50eb6 191 }
jsa1969 11:6844a5578b4f 192 }
jsa1969 9:5150afa50eb6 193
jsa1969 11:6844a5578b4f 194 void initSgp30(){
jsa1969 9:5150afa50eb6 195 if (sgp30!=NULL){
jsa1969 9:5150afa50eb6 196 delete sgp30;
jsa1969 9:5150afa50eb6 197 }
jsa1969 9:5150afa50eb6 198 sgp30 = new Sgp30(callbacks);
jsa1969 9:5150afa50eb6 199 if (sgp30->test() && sgp30->begin()) {
jsa1969 9:5150afa50eb6 200 uBit.display.image.setPixelValue(1, 4, 255);
jsa1969 9:5150afa50eb6 201 } else {
jsa1969 9:5150afa50eb6 202 delete sgp30;
jsa1969 9:5150afa50eb6 203 sgp30 = NULL;
jsa1969 11:6844a5578b4f 204 }}
jsa1969 11:6844a5578b4f 205
jsa1969 11:6844a5578b4f 206 void initSensors() {
jsa1969 12:96eb06e837f4 207 waitForLooppsToFinish();
jsa1969 11:6844a5578b4f 208 init680();
jsa1969 11:6844a5578b4f 209 initSgp30();
jsa1969 9:5150afa50eb6 210 }
jsa1969 9:5150afa50eb6 211
jsa1969 12:96eb06e837f4 212 void displayValuesTxt() {
jsa1969 12:96eb06e837f4 213 waitForLooppsToFinish();
jsa1969 8:1bdb50e03d39 214 if (bme680Data!=NULL) {
jsa1969 8:1bdb50e03d39 215 uBit.display.scroll("g");
jsa1969 8:1bdb50e03d39 216 uBit.display.scroll((int)bme680Data->gas_resistance);
jsa1969 8:1bdb50e03d39 217 uBit.display.scroll("+");
jsa1969 14:71060505061e 218 uBit.display.scroll((int)nvStore->getGasMax());
jsa1969 14:71060505061e 219 uBit.display.scroll("-");
jsa1969 14:71060505061e 220 uBit.display.scroll((int)nvStore->getGasMin());
jsa1969 17:a2c4dd192146 221 uBit.display.scroll("t");
jsa1969 17:a2c4dd192146 222 uBit.display.scroll((int)bme680Data->temperature);
jsa1969 17:a2c4dd192146 223 uBit.display.scroll("+");
jsa1969 17:a2c4dd192146 224 uBit.display.scroll((int)nvStore->getTempMax());
jsa1969 17:a2c4dd192146 225 uBit.display.scroll("-");
jsa1969 17:a2c4dd192146 226 uBit.display.scroll((int)nvStore->getTempMin());
jsa1969 17:a2c4dd192146 227 uBit.display.scroll("p");
jsa1969 17:a2c4dd192146 228 uBit.display.scroll((int)bme680Data->pressure);
jsa1969 17:a2c4dd192146 229 uBit.display.scroll("+");
jsa1969 17:a2c4dd192146 230 uBit.display.scroll((int)nvStore->getPressMax());
jsa1969 17:a2c4dd192146 231 uBit.display.scroll("-");
jsa1969 17:a2c4dd192146 232 uBit.display.scroll((int)nvStore->getPressMin());
jsa1969 17:a2c4dd192146 233 uBit.display.scroll("h");
jsa1969 17:a2c4dd192146 234 uBit.display.scroll((int)bme680Data->humidity);
jsa1969 17:a2c4dd192146 235 uBit.display.scroll("+");
jsa1969 17:a2c4dd192146 236 uBit.display.scroll((int)nvStore->getHumMax());
jsa1969 17:a2c4dd192146 237 uBit.display.scroll("-");
jsa1969 17:a2c4dd192146 238 uBit.display.scroll((int)nvStore->getHumMin());
jsa1969 8:1bdb50e03d39 239 }
jsa1969 17:a2c4dd192146 240
jsa1969 8:1bdb50e03d39 241 if (sgp30!=NULL) {
jsa1969 8:1bdb50e03d39 242 uBit.display.scroll("v");
jsa1969 8:1bdb50e03d39 243 uBit.display.scroll((int)sgp30->TVOC);
jsa1969 18:c4ac93e01027 244 uBit.display.scroll("+");
jsa1969 18:c4ac93e01027 245 uBit.display.scroll((int)nvStore->getVocMax());
jsa1969 18:c4ac93e01027 246 uBit.display.scroll("-");
jsa1969 18:c4ac93e01027 247 uBit.display.scroll((int)nvStore->getVocMin());
jsa1969 8:1bdb50e03d39 248 uBit.display.scroll("c");
jsa1969 8:1bdb50e03d39 249 uBit.display.scroll((int)sgp30->eCO2);
jsa1969 18:c4ac93e01027 250 uBit.display.scroll("+");
jsa1969 18:c4ac93e01027 251 uBit.display.scroll((int)nvStore->getCoMax());
jsa1969 18:c4ac93e01027 252 uBit.display.scroll("-");
jsa1969 18:c4ac93e01027 253 uBit.display.scroll((int)nvStore->getCoMin());
jsa1969 8:1bdb50e03d39 254 }
jsa1969 0:cef60cc92da0 255 }
jsa1969 0:cef60cc92da0 256
jsa1969 12:96eb06e837f4 257 void onButtonA(MicroBitEvent evt)
jsa1969 12:96eb06e837f4 258 {
jsa1969 12:96eb06e837f4 259 if (runningLoops>0) {
jsa1969 12:96eb06e837f4 260 displayValuesTxt();
jsa1969 12:96eb06e837f4 261 } else {
jsa1969 12:96eb06e837f4 262 startLoops();
jsa1969 12:96eb06e837f4 263 }
jsa1969 12:96eb06e837f4 264 }
jsa1969 12:96eb06e837f4 265
jsa1969 12:96eb06e837f4 266 void onButtonB(MicroBitEvent evt)
jsa1969 12:96eb06e837f4 267 {
jsa1969 12:96eb06e837f4 268 initSensors();
jsa1969 12:96eb06e837f4 269 }
jsa1969 12:96eb06e837f4 270
jsa1969 9:5150afa50eb6 271 void onButtonAB(MicroBitEvent evt)
jsa1969 9:5150afa50eb6 272 {
jsa1969 12:96eb06e837f4 273 nvStore->resetNvStore();
jsa1969 9:5150afa50eb6 274 }
jsa1969 9:5150afa50eb6 275
jsa1969 0:cef60cc92da0 276 int main()
jsa1969 0:cef60cc92da0 277 {
jsa1969 0:cef60cc92da0 278 uBit.init();
jsa1969 0:cef60cc92da0 279
jsa1969 0:cef60cc92da0 280 uBit.messageBus.listen(MICROBIT_ID_BUTTON_A, MICROBIT_BUTTON_EVT_CLICK, onButtonA);
jsa1969 0:cef60cc92da0 281 uBit.messageBus.listen(MICROBIT_ID_BUTTON_B, MICROBIT_BUTTON_EVT_CLICK, onButtonB);
jsa1969 9:5150afa50eb6 282 uBit.messageBus.listen(MICROBIT_ID_BUTTON_AB, MICROBIT_BUTTON_EVT_CLICK, onButtonAB);
jsa1969 2:544117df8c65 283
jsa1969 9:5150afa50eb6 284 callbacks = new I2cCallbacks(&uBit);
jsa1969 12:96eb06e837f4 285 nvStore = new NvStore(&uBit);
jsa1969 9:5150afa50eb6 286
jsa1969 9:5150afa50eb6 287 initSensors();
jsa1969 9:5150afa50eb6 288
jsa1969 12:96eb06e837f4 289 startLoops();
jsa1969 2:544117df8c65 290
jsa1969 0:cef60cc92da0 291 release_fiber();
jsa1969 0:cef60cc92da0 292 }
jsa1969 0:cef60cc92da0 293