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@14:71060505061e, 2018-12-05 (annotated)

Committer:
jsa1969
Date:
Wed Dec 05 10:50:53 2018 +0000
Revision:
14:71060505061e
Parent:
13:996026828be7
Child:
17:a2c4dd192146
more flexible nvstore

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 14:71060505061e 83 uBit.display.image.setPixelValue(0, 4, 255);
jsa1969 11:6844a5578b4f 84 uBit.display.image.setPixelValue(4, 4, 0);
jsa1969 11:6844a5578b4f 85 int bmeY = sgp30!=NULL ? 2 : 0;
jsa1969 11:6844a5578b4f 86 int bmeMaxPixels = sgp30!=NULL ? 5 : 15;
jsa1969 14:71060505061e 87 displayPixels(bmeY, DotMath::pixels(bme680Data->gas_resistance, nvStore->getGasMax(), bmeMaxPixels),
jsa1969 11:6844a5578b4f 88 bmeMaxPixels);
jsa1969 11:6844a5578b4f 89 displayPixels(3, 5*bme680Data->humidity/100000, 5);
jsa1969 14:71060505061e 90 } else {
jsa1969 14:71060505061e 91 uBit.display.image.setPixelValue(0, 4, 0);
jsa1969 2:544117df8c65 92 }
jsa1969 12:96eb06e837f4 93 uBit.display.image.setPixelValue(4, 4, 0);
jsa1969 11:6844a5578b4f 94 }
jsa1969 11:6844a5578b4f 95 }
jsa1969 11:6844a5578b4f 96
jsa1969 11:6844a5578b4f 97 void measureAndDisplaySgp30() {
jsa1969 11:6844a5578b4f 98 if (sgp30!=NULL) {
jsa1969 11:6844a5578b4f 99 int sgpMaxPixels = 10;
jsa1969 11:6844a5578b4f 100 int secondLineStart = 2;
jsa1969 11:6844a5578b4f 101 if (bme680!=NULL) {
jsa1969 11:6844a5578b4f 102 sgpMaxPixels = 5;
jsa1969 11:6844a5578b4f 103 secondLineStart = 1;
jsa1969 11:6844a5578b4f 104 uBit.display.image.setPixelValue(2, 4, 255);
jsa1969 11:6844a5578b4f 105 if (sgp30->setHumidity(bme680Data->humidity, bme680Data->temperature)) {
jsa1969 11:6844a5578b4f 106 uBit.display.image.setPixelValue(2, 4, 0);
jsa1969 11:6844a5578b4f 107 }
jsa1969 11:6844a5578b4f 108 uBit.sleep(10);
jsa1969 11:6844a5578b4f 109 }
jsa1969 11:6844a5578b4f 110 uBit.display.image.setPixelValue(3, 4, 255);
jsa1969 11:6844a5578b4f 111 if (sgp30->IAQmeasure()) {
jsa1969 13:996026828be7 112 uBit.display.image.setPixelValue(1, 4, 255);
jsa1969 11:6844a5578b4f 113 uBit.display.image.setPixelValue(3, 4, 0);
jsa1969 12:96eb06e837f4 114 int co2Dots = min (5, sgp30->eCO2 /1500);
jsa1969 11:6844a5578b4f 115 displayPixels(0, 5 - DotMath::pixels(sgp30->TVOC, 20000, sgpMaxPixels), sgpMaxPixels);
jsa1969 11:6844a5578b4f 116 displayPixels(secondLineStart, co2Dots, sgpMaxPixels);
jsa1969 13:996026828be7 117 } else {
jsa1969 13:996026828be7 118 uBit.display.image.setPixelValue(1, 4, 0);
jsa1969 11:6844a5578b4f 119 }
jsa1969 2:544117df8c65 120 }
jsa1969 2:544117df8c65 121 }
jsa1969 2:544117df8c65 122
jsa1969 12:96eb06e837f4 123 void bmeMeasureLoop() {
jsa1969 12:96eb06e837f4 124 if (bme680!=NULL) {
jsa1969 12:96eb06e837f4 125 ++runningLoops;
jsa1969 12:96eb06e837f4 126 while (!cancelMeasureLoops){
jsa1969 11:6844a5578b4f 127 measureAndDisplayBme680();
jsa1969 13:996026828be7 128 uBit.sleep(500);
jsa1969 12:96eb06e837f4 129 }
jsa1969 12:96eb06e837f4 130 --runningLoops;
jsa1969 12:96eb06e837f4 131 }
jsa1969 12:96eb06e837f4 132 }
jsa1969 12:96eb06e837f4 133
jsa1969 12:96eb06e837f4 134 void sgpMeasureLoop() {
jsa1969 12:96eb06e837f4 135 if (sgp30!=NULL) {
jsa1969 12:96eb06e837f4 136 ++runningLoops;
jsa1969 12:96eb06e837f4 137 while (!cancelMeasureLoops){
jsa1969 11:6844a5578b4f 138 measureAndDisplaySgp30();
jsa1969 12:96eb06e837f4 139 uBit.sleep(950);
jsa1969 2:544117df8c65 140 }
jsa1969 12:96eb06e837f4 141 --runningLoops;
jsa1969 2:544117df8c65 142 }
jsa1969 12:96eb06e837f4 143 }
jsa1969 12:96eb06e837f4 144
jsa1969 12:96eb06e837f4 145 void startLoops() {
jsa1969 12:96eb06e837f4 146 if (runningLoops>0) {
jsa1969 12:96eb06e837f4 147 uBit.display.scroll("already running");
jsa1969 12:96eb06e837f4 148 return;
jsa1969 12:96eb06e837f4 149 }
jsa1969 14:71060505061e 150 create_fiber(sgpMeasureLoop);
jsa1969 12:96eb06e837f4 151 create_fiber(bmeMeasureLoop);
jsa1969 2:544117df8c65 152 }
jsa1969 2:544117df8c65 153
jsa1969 11:6844a5578b4f 154 void init680(){
jsa1969 9:5150afa50eb6 155 if (bme680!=NULL){
jsa1969 9:5150afa50eb6 156 delete bme680;
jsa1969 9:5150afa50eb6 157 }
jsa1969 10:8e6b71a46871 158
jsa1969 14:71060505061e 159 uint32_t gasMax = nvStore->getGasMax();
jsa1969 11:6844a5578b4f 160 if (gasMax>0) {
jsa1969 11:6844a5578b4f 161 uBit.display.scroll((int)gasMax);
jsa1969 11:6844a5578b4f 162 }
jsa1969 10:8e6b71a46871 163
jsa1969 14:71060505061e 164 bme680 = new Bme680(callbacks);
jsa1969 9:5150afa50eb6 165 int code = bme680->init();
jsa1969 9:5150afa50eb6 166 if (code == MICROBIT_OK){
jsa1969 9:5150afa50eb6 167 if (bme680Data==NULL) {
jsa1969 9:5150afa50eb6 168 bme680Data = new struct bme680_field_data;
jsa1969 9:5150afa50eb6 169 }
jsa1969 9:5150afa50eb6 170 code = bme680->measure(
jsa1969 9:5150afa50eb6 171 bme680Data,
jsa1969 9:5150afa50eb6 172 uBit.thermometer.getTemperature(),
jsa1969 9:5150afa50eb6 173 100, 100);
jsa1969 9:5150afa50eb6 174 }
jsa1969 9:5150afa50eb6 175 if (code != MICROBIT_OK){
jsa1969 9:5150afa50eb6 176 delete bme680;
jsa1969 9:5150afa50eb6 177 bme680 = NULL;
jsa1969 9:5150afa50eb6 178 delete bme680Data;
jsa1969 9:5150afa50eb6 179 bme680Data = NULL;
jsa1969 9:5150afa50eb6 180 uBit.display.scroll(code);
jsa1969 9:5150afa50eb6 181 } else {
jsa1969 9:5150afa50eb6 182 uBit.display.image.setPixelValue(0, 4, 255);
jsa1969 9:5150afa50eb6 183 }
jsa1969 11:6844a5578b4f 184 }
jsa1969 9:5150afa50eb6 185
jsa1969 11:6844a5578b4f 186 void initSgp30(){
jsa1969 9:5150afa50eb6 187 if (sgp30!=NULL){
jsa1969 9:5150afa50eb6 188 delete sgp30;
jsa1969 9:5150afa50eb6 189 }
jsa1969 9:5150afa50eb6 190 sgp30 = new Sgp30(callbacks);
jsa1969 9:5150afa50eb6 191 if (sgp30->test() && sgp30->begin()) {
jsa1969 9:5150afa50eb6 192 uBit.display.image.setPixelValue(1, 4, 255);
jsa1969 9:5150afa50eb6 193 } else {
jsa1969 9:5150afa50eb6 194 delete sgp30;
jsa1969 9:5150afa50eb6 195 sgp30 = NULL;
jsa1969 11:6844a5578b4f 196 }}
jsa1969 11:6844a5578b4f 197
jsa1969 11:6844a5578b4f 198 void initSensors() {
jsa1969 12:96eb06e837f4 199 waitForLooppsToFinish();
jsa1969 11:6844a5578b4f 200 init680();
jsa1969 11:6844a5578b4f 201 initSgp30();
jsa1969 9:5150afa50eb6 202 }
jsa1969 9:5150afa50eb6 203
jsa1969 12:96eb06e837f4 204 void displayValuesTxt() {
jsa1969 12:96eb06e837f4 205 waitForLooppsToFinish();
jsa1969 8:1bdb50e03d39 206 if (bme680Data!=NULL) {
jsa1969 8:1bdb50e03d39 207 uBit.display.scroll("h");
jsa1969 8:1bdb50e03d39 208 uBit.display.scroll((int)Physics::absHumidity(bme680Data->humidity, bme680Data->temperature));
jsa1969 8:1bdb50e03d39 209 uBit.display.scroll("g");
jsa1969 8:1bdb50e03d39 210 uBit.display.scroll((int)bme680Data->gas_resistance);
jsa1969 8:1bdb50e03d39 211 }
jsa1969 8:1bdb50e03d39 212 if (bme680!=NULL) {
jsa1969 8:1bdb50e03d39 213 uBit.display.scroll("+");
jsa1969 14:71060505061e 214 uBit.display.scroll((int)nvStore->getGasMax());
jsa1969 14:71060505061e 215 uBit.display.scroll("-");
jsa1969 14:71060505061e 216 uBit.display.scroll((int)nvStore->getGasMin());
jsa1969 8:1bdb50e03d39 217 }
jsa1969 8:1bdb50e03d39 218 if (sgp30!=NULL) {
jsa1969 8:1bdb50e03d39 219 uBit.display.scroll("v");
jsa1969 8:1bdb50e03d39 220 uBit.display.scroll((int)sgp30->TVOC);
jsa1969 8:1bdb50e03d39 221 uBit.display.scroll("c");
jsa1969 8:1bdb50e03d39 222 uBit.display.scroll((int)sgp30->eCO2);
jsa1969 8:1bdb50e03d39 223 }
jsa1969 0:cef60cc92da0 224 }
jsa1969 0:cef60cc92da0 225
jsa1969 12:96eb06e837f4 226 void onButtonA(MicroBitEvent evt)
jsa1969 12:96eb06e837f4 227 {
jsa1969 12:96eb06e837f4 228 if (runningLoops>0) {
jsa1969 12:96eb06e837f4 229 displayValuesTxt();
jsa1969 12:96eb06e837f4 230 } else {
jsa1969 12:96eb06e837f4 231 startLoops();
jsa1969 12:96eb06e837f4 232 }
jsa1969 12:96eb06e837f4 233 }
jsa1969 12:96eb06e837f4 234
jsa1969 12:96eb06e837f4 235 void onButtonB(MicroBitEvent evt)
jsa1969 12:96eb06e837f4 236 {
jsa1969 12:96eb06e837f4 237 initSensors();
jsa1969 12:96eb06e837f4 238 }
jsa1969 12:96eb06e837f4 239
jsa1969 9:5150afa50eb6 240 void onButtonAB(MicroBitEvent evt)
jsa1969 9:5150afa50eb6 241 {
jsa1969 12:96eb06e837f4 242 nvStore->resetNvStore();
jsa1969 9:5150afa50eb6 243 }
jsa1969 9:5150afa50eb6 244
jsa1969 0:cef60cc92da0 245 int main()
jsa1969 0:cef60cc92da0 246 {
jsa1969 0:cef60cc92da0 247 uBit.init();
jsa1969 0:cef60cc92da0 248
jsa1969 0:cef60cc92da0 249 uBit.messageBus.listen(MICROBIT_ID_BUTTON_A, MICROBIT_BUTTON_EVT_CLICK, onButtonA);
jsa1969 0:cef60cc92da0 250 uBit.messageBus.listen(MICROBIT_ID_BUTTON_B, MICROBIT_BUTTON_EVT_CLICK, onButtonB);
jsa1969 9:5150afa50eb6 251 uBit.messageBus.listen(MICROBIT_ID_BUTTON_AB, MICROBIT_BUTTON_EVT_CLICK, onButtonAB);
jsa1969 2:544117df8c65 252
jsa1969 9:5150afa50eb6 253 callbacks = new I2cCallbacks(&uBit);
jsa1969 12:96eb06e837f4 254 nvStore = new NvStore(&uBit);
jsa1969 9:5150afa50eb6 255
jsa1969 9:5150afa50eb6 256 initSensors();
jsa1969 9:5150afa50eb6 257
jsa1969 12:96eb06e837f4 258 startLoops();
jsa1969 2:544117df8c65 259
jsa1969 0:cef60cc92da0 260 release_fiber();
jsa1969 0:cef60cc92da0 261 }
jsa1969 0:cef60cc92da0 262