Y SI / lib_SHT11

lib_SHT11

Dependents:   lib_SHT11_example libs_YSI_example

lib_SHT11.cpp@0:6b657f74b4e4, 2017-06-06 (annotated)

Committer:
YSI
Date:
Tue Jun 06 14:08:27 2017 +0000
Revision:
0:6b657f74b4e4
lib_SHT11

Who changed what in which revision?

UserRevisionLine numberNew contents of line
YSI 0:6b657f74b4e4 1 /** SHT11 class
YSI 0:6b657f74b4e4 2 *
YSI 0:6b657f74b4e4 3 * @purpose library for SHT11 humidity and temperature sensor
YSI 0:6b657f74b4e4 4 *
YSI 0:6b657f74b4e4 5 * Utilisée pour mesurer la temperature et l'humidite
YSI 0:6b657f74b4e4 6 *
YSI 0:6b657f74b4e4 7 * https://www.sensirion.com/products/humidity-sensor/
YSI 0:6b657f74b4e4 8 *
YSI 0:6b657f74b4e4 9 * Copyright (c) 2012, cstyles (http://mbed.org)
YSI 0:6b657f74b4e4 10 *
YSI 0:6b657f74b4e4 11 * Exemple:
YSI 0:6b657f74b4e4 12 * @code
YSI 0:6b657f74b4e4 13 * #include "mbed.h"
YSI 0:6b657f74b4e4 14 * #include "lib_SHT11.h"
YSI 0:6b657f74b4e4 15 *
YSI 0:6b657f74b4e4 16 * SHT11 capteur_HT;
YSI 0:6b657f74b4e4 17 * //SHT11 capteur_HT(p30, p29, 2.0); //data, sck, periode_cycle_mesure
YSI 0:6b657f74b4e4 18 * Serial pc(USBTX, USBRX);
YSI 0:6b657f74b4e4 19 *
YSI 0:6b657f74b4e4 20 * int main()
YSI 0:6b657f74b4e4 21 * {
YSI 0:6b657f74b4e4 22 * float Temperature_mesuree=0.0, Humidite_mesuree=0.0;
YSI 0:6b657f74b4e4 23 *
YSI 0:6b657f74b4e4 24 * while(1)
YSI 0:6b657f74b4e4 25 * {
YSI 0:6b657f74b4e4 26 * if((Temperature_mesuree != capteur_HT.lire_T()) || (Humidite_mesuree != capteur_HT.lire_H()))
YSI 0:6b657f74b4e4 27 * {
YSI 0:6b657f74b4e4 28 * capteur_HT.lire_T_H(&Temperature_mesuree, &Humidite_mesuree);
YSI 0:6b657f74b4e4 29 * pc.printf("T=%f\tH=%f\r\n", Temperature_mesuree, Humidite_mesuree);
YSI 0:6b657f74b4e4 30 * }
YSI 0:6b657f74b4e4 31 * }
YSI 0:6b657f74b4e4 32 * }
YSI 0:6b657f74b4e4 33 * @endcode
YSI 0:6b657f74b4e4 34 * @file lib_SHT11.cpp
YSI 0:6b657f74b4e4 35 * @date Jun 2012
YSI 0:6b657f74b4e4 36 * @author Yannic Simon
YSI 0:6b657f74b4e4 37 */
YSI 0:6b657f74b4e4 38
YSI 0:6b657f74b4e4 39 #include "lib_SHT11.h"
YSI 0:6b657f74b4e4 40
YSI 0:6b657f74b4e4 41
YSI 0:6b657f74b4e4 42 SHT11::SHT11(PinName pin_DATA, PinName pin_SCK, float T_C_mesure) : DATA_HT(pin_DATA), SCK_HT(pin_SCK), Temps_cycle_mesure(T_C_mesure)
YSI 0:6b657f74b4e4 43 {
YSI 0:6b657f74b4e4 44 if(Temps_cycle_mesure < 2) Temps_cycle_mesure = 2;
YSI 0:6b657f74b4e4 45 init();
YSI 0:6b657f74b4e4 46 }
YSI 0:6b657f74b4e4 47
YSI 0:6b657f74b4e4 48 void SHT11::start(void)
YSI 0:6b657f74b4e4 49 {
YSI 0:6b657f74b4e4 50 DATA_HT.output();
YSI 0:6b657f74b4e4 51 DATA_HT=1;
YSI 0:6b657f74b4e4 52 SCK_HT=0;
YSI 0:6b657f74b4e4 53 wait_us(1);
YSI 0:6b657f74b4e4 54 SCK_HT=1;
YSI 0:6b657f74b4e4 55 wait_us(1);
YSI 0:6b657f74b4e4 56 DATA_HT=0;
YSI 0:6b657f74b4e4 57 wait_us(1);
YSI 0:6b657f74b4e4 58 SCK_HT=0;
YSI 0:6b657f74b4e4 59 wait_us(1);
YSI 0:6b657f74b4e4 60 SCK_HT=1;
YSI 0:6b657f74b4e4 61 wait_us(1);
YSI 0:6b657f74b4e4 62 DATA_HT=1;
YSI 0:6b657f74b4e4 63 wait_us(1);
YSI 0:6b657f74b4e4 64 SCK_HT=0;
YSI 0:6b657f74b4e4 65 wait_us(1);
YSI 0:6b657f74b4e4 66 DATA_HT=0;
YSI 0:6b657f74b4e4 67 }
YSI 0:6b657f74b4e4 68
YSI 0:6b657f74b4e4 69 void SHT11::changer_timer_cycle(float new_Temps_cycle_mesure)
YSI 0:6b657f74b4e4 70 {
YSI 0:6b657f74b4e4 71 if(new_Temps_cycle_mesure < 2) Temps_cycle_mesure = 2;
YSI 0:6b657f74b4e4 72 else Temps_cycle_mesure = new_Temps_cycle_mesure;
YSI 0:6b657f74b4e4 73 if(etat_cycle) desactiver(); init();
YSI 0:6b657f74b4e4 74 }
YSI 0:6b657f74b4e4 75
YSI 0:6b657f74b4e4 76 void SHT11::init(void)
YSI 0:6b657f74b4e4 77 {
YSI 0:6b657f74b4e4 78 // ____________________________________________
YSI 0:6b657f74b4e4 79 // DATA_HT |__
YSI 0:6b657f74b4e4 80 // __ __ __ __ __ __ __ __ __
YSI 0:6b657f74b4e4 81 // SCK_HT _| |_| |_| |_| |_| |_| |_| |_| |_| |_
YSI 0:6b657f74b4e4 82 unsigned char i;
YSI 0:6b657f74b4e4 83 DATA_HT.output();
YSI 0:6b657f74b4e4 84 DATA_HT=1;
YSI 0:6b657f74b4e4 85 SCK_HT=0;
YSI 0:6b657f74b4e4 86 for (i=0;i<9;i++)
YSI 0:6b657f74b4e4 87 {
YSI 0:6b657f74b4e4 88 SCK_HT=1;
YSI 0:6b657f74b4e4 89 wait_us(1);
YSI 0:6b657f74b4e4 90 SCK_HT=0;
YSI 0:6b657f74b4e4 91 wait_us(1);
YSI 0:6b657f74b4e4 92 }
YSI 0:6b657f74b4e4 93 etat_sht11=0;
YSI 0:6b657f74b4e4 94 etat_cycle=1;
YSI 0:6b657f74b4e4 95 Timer_cycle_mesure.attach(callback(this, &SHT11::gestion_HT), Temps_cycle_mesure);
YSI 0:6b657f74b4e4 96 }
YSI 0:6b657f74b4e4 97
YSI 0:6b657f74b4e4 98 void SHT11::desactiver(void)
YSI 0:6b657f74b4e4 99 {
YSI 0:6b657f74b4e4 100 etat_cycle=0;
YSI 0:6b657f74b4e4 101 Timer_cycle_mesure.detach();
YSI 0:6b657f74b4e4 102 }
YSI 0:6b657f74b4e4 103
YSI 0:6b657f74b4e4 104 void SHT11::demande_mesure(short octet_de_commande)
YSI 0:6b657f74b4e4 105 {
YSI 0:6b657f74b4e4 106 unsigned int i;
YSI 0:6b657f74b4e4 107
YSI 0:6b657f74b4e4 108 DATA_HT.output();
YSI 0:6b657f74b4e4 109 for(i=0;i<8;i++)
YSI 0:6b657f74b4e4 110 {
YSI 0:6b657f74b4e4 111 if ((octet_de_commande)&(0x80)) DATA_HT=1;
YSI 0:6b657f74b4e4 112 else DATA_HT=0;
YSI 0:6b657f74b4e4 113 wait_us(1);
YSI 0:6b657f74b4e4 114 SCK_HT=1;
YSI 0:6b657f74b4e4 115 wait_us(1);
YSI 0:6b657f74b4e4 116 SCK_HT=0;
YSI 0:6b657f74b4e4 117 octet_de_commande=octet_de_commande*2;
YSI 0:6b657f74b4e4 118 }
YSI 0:6b657f74b4e4 119 DATA_HT.input();
YSI 0:6b657f74b4e4 120 wait_us(1);
YSI 0:6b657f74b4e4 121 SCK_HT=1;
YSI 0:6b657f74b4e4 122 wait_us(1);
YSI 0:6b657f74b4e4 123 SCK_HT=0;
YSI 0:6b657f74b4e4 124 wait_us(1);
YSI 0:6b657f74b4e4 125 DATA_HT.output();
YSI 0:6b657f74b4e4 126 DATA_HT=1;
YSI 0:6b657f74b4e4 127 DATA_HT.input();
YSI 0:6b657f74b4e4 128 }
YSI 0:6b657f74b4e4 129
YSI 0:6b657f74b4e4 130 void SHT11::mesure_T(void)
YSI 0:6b657f74b4e4 131 {
YSI 0:6b657f74b4e4 132 start();
YSI 0:6b657f74b4e4 133 demande_mesure(3);
YSI 0:6b657f74b4e4 134 }
YSI 0:6b657f74b4e4 135
YSI 0:6b657f74b4e4 136 void SHT11::mesure_H(void)
YSI 0:6b657f74b4e4 137 {
YSI 0:6b657f74b4e4 138 start();
YSI 0:6b657f74b4e4 139 demande_mesure(5);
YSI 0:6b657f74b4e4 140 }
YSI 0:6b657f74b4e4 141
YSI 0:6b657f74b4e4 142 void SHT11::calcul_Temperature_Humidite(void)
YSI 0:6b657f74b4e4 143 {
YSI 0:6b657f74b4e4 144 Temperature_mesuree=(Temperature*0.01-40);
YSI 0:6b657f74b4e4 145 Humidite_mesuree=((float)Temperature_mesuree-25.0)*(0.01+(0.00008*Humidite))-4+0.0405*Humidite-0.0000028*Humidite*Humidite;
YSI 0:6b657f74b4e4 146 }
YSI 0:6b657f74b4e4 147
YSI 0:6b657f74b4e4 148 void SHT11::reception_mesure_T(void)
YSI 0:6b657f74b4e4 149 {
YSI 0:6b657f74b4e4 150 unsigned int i;
YSI 0:6b657f74b4e4 151 Temperature=0;
YSI 0:6b657f74b4e4 152
YSI 0:6b657f74b4e4 153 DATA_HT.input();
YSI 0:6b657f74b4e4 154 for (i=0;i<8;i++)
YSI 0:6b657f74b4e4 155 {
YSI 0:6b657f74b4e4 156 SCK_HT=1;
YSI 0:6b657f74b4e4 157 wait_us(1);
YSI 0:6b657f74b4e4 158 Temperature *=2;
YSI 0:6b657f74b4e4 159 if (DATA_HT==1) Temperature++;
YSI 0:6b657f74b4e4 160 SCK_HT=0;
YSI 0:6b657f74b4e4 161 wait_us(1);
YSI 0:6b657f74b4e4 162 }
YSI 0:6b657f74b4e4 163 DATA_HT.output();
YSI 0:6b657f74b4e4 164 DATA_HT=0;
YSI 0:6b657f74b4e4 165 SCK_HT=1;
YSI 0:6b657f74b4e4 166 wait_us(1);
YSI 0:6b657f74b4e4 167 SCK_HT=0;
YSI 0:6b657f74b4e4 168 wait_us(1);
YSI 0:6b657f74b4e4 169 DATA_HT.input();
YSI 0:6b657f74b4e4 170 for (i=0;i<8;i++)
YSI 0:6b657f74b4e4 171 {
YSI 0:6b657f74b4e4 172 SCK_HT=1;
YSI 0:6b657f74b4e4 173 wait_us(1);
YSI 0:6b657f74b4e4 174 Temperature *=2;
YSI 0:6b657f74b4e4 175 if (DATA_HT==1) Temperature++;
YSI 0:6b657f74b4e4 176 SCK_HT=0;
YSI 0:6b657f74b4e4 177 wait_us(1);
YSI 0:6b657f74b4e4 178 }
YSI 0:6b657f74b4e4 179 DATA_HT.output();
YSI 0:6b657f74b4e4 180 DATA_HT=1;
YSI 0:6b657f74b4e4 181 SCK_HT=1;
YSI 0:6b657f74b4e4 182 wait_us(1);
YSI 0:6b657f74b4e4 183 SCK_HT=0;
YSI 0:6b657f74b4e4 184 wait_us(1);
YSI 0:6b657f74b4e4 185 }
YSI 0:6b657f74b4e4 186
YSI 0:6b657f74b4e4 187 void SHT11::reception_mesure_H(void)
YSI 0:6b657f74b4e4 188 {
YSI 0:6b657f74b4e4 189 unsigned int i;
YSI 0:6b657f74b4e4 190 Humidite=0;
YSI 0:6b657f74b4e4 191
YSI 0:6b657f74b4e4 192 DATA_HT.input();
YSI 0:6b657f74b4e4 193 for (i=0;i<8;i++)
YSI 0:6b657f74b4e4 194 {
YSI 0:6b657f74b4e4 195 SCK_HT=1;
YSI 0:6b657f74b4e4 196 wait_us(1);
YSI 0:6b657f74b4e4 197 Humidite *=2;
YSI 0:6b657f74b4e4 198 if (DATA_HT==1) Humidite++;
YSI 0:6b657f74b4e4 199 SCK_HT=0;
YSI 0:6b657f74b4e4 200 wait_us(1);
YSI 0:6b657f74b4e4 201 }
YSI 0:6b657f74b4e4 202 DATA_HT.output();
YSI 0:6b657f74b4e4 203 DATA_HT=0;
YSI 0:6b657f74b4e4 204 SCK_HT=1;
YSI 0:6b657f74b4e4 205 wait_us(1);
YSI 0:6b657f74b4e4 206 SCK_HT=0;
YSI 0:6b657f74b4e4 207 wait_us(1);
YSI 0:6b657f74b4e4 208 DATA_HT.input();
YSI 0:6b657f74b4e4 209 for (i=0;i<8;i++)
YSI 0:6b657f74b4e4 210 {
YSI 0:6b657f74b4e4 211 SCK_HT=1;
YSI 0:6b657f74b4e4 212 wait_us(1);
YSI 0:6b657f74b4e4 213 Humidite *=2;
YSI 0:6b657f74b4e4 214 if (DATA_HT==1) Humidite++;
YSI 0:6b657f74b4e4 215 SCK_HT=0;
YSI 0:6b657f74b4e4 216 wait_us(1);
YSI 0:6b657f74b4e4 217 }
YSI 0:6b657f74b4e4 218 DATA_HT.output();
YSI 0:6b657f74b4e4 219 DATA_HT=1;
YSI 0:6b657f74b4e4 220 SCK_HT=1;
YSI 0:6b657f74b4e4 221 wait_us(1);
YSI 0:6b657f74b4e4 222 SCK_HT=0;
YSI 0:6b657f74b4e4 223 wait_us(1);
YSI 0:6b657f74b4e4 224 }
YSI 0:6b657f74b4e4 225
YSI 0:6b657f74b4e4 226 void SHT11::gestion_HT(void)
YSI 0:6b657f74b4e4 227 {
YSI 0:6b657f74b4e4 228 switch (etat_sht11)
YSI 0:6b657f74b4e4 229 {
YSI 0:6b657f74b4e4 230 case 0:
YSI 0:6b657f74b4e4 231 Timer_cycle_mesure.detach();
YSI 0:6b657f74b4e4 232 mesure_T();
YSI 0:6b657f74b4e4 233 etat_sht11=1;
YSI 0:6b657f74b4e4 234 Timer_cycle_mesure.attach_us(callback(this, &SHT11::gestion_HT), 10000);
YSI 0:6b657f74b4e4 235 break;
YSI 0:6b657f74b4e4 236
YSI 0:6b657f74b4e4 237 case 1:
YSI 0:6b657f74b4e4 238 DATA_HT.input();
YSI 0:6b657f74b4e4 239 if (DATA_HT==0)
YSI 0:6b657f74b4e4 240 {
YSI 0:6b657f74b4e4 241 Timer_cycle_mesure.detach();
YSI 0:6b657f74b4e4 242 etat_sht11=2;
YSI 0:6b657f74b4e4 243 Timer_cycle_mesure.attach_us(callback(this, &SHT11::gestion_HT), 1);
YSI 0:6b657f74b4e4 244 }
YSI 0:6b657f74b4e4 245 break;
YSI 0:6b657f74b4e4 246
YSI 0:6b657f74b4e4 247 case 2:
YSI 0:6b657f74b4e4 248 Timer_cycle_mesure.detach();
YSI 0:6b657f74b4e4 249 reception_mesure_T();
YSI 0:6b657f74b4e4 250 etat_sht11=3;
YSI 0:6b657f74b4e4 251 Timer_cycle_mesure.attach_us(callback(this, &SHT11::gestion_HT), 1);
YSI 0:6b657f74b4e4 252 break;
YSI 0:6b657f74b4e4 253
YSI 0:6b657f74b4e4 254 case 3:
YSI 0:6b657f74b4e4 255 Timer_cycle_mesure.detach();
YSI 0:6b657f74b4e4 256 mesure_H();
YSI 0:6b657f74b4e4 257 etat_sht11=4;
YSI 0:6b657f74b4e4 258 Timer_cycle_mesure.attach_us(callback(this, &SHT11::gestion_HT), 10000);
YSI 0:6b657f74b4e4 259 break;
YSI 0:6b657f74b4e4 260
YSI 0:6b657f74b4e4 261 case 4:
YSI 0:6b657f74b4e4 262 DATA_HT.input();
YSI 0:6b657f74b4e4 263 if (DATA_HT==0)
YSI 0:6b657f74b4e4 264 {
YSI 0:6b657f74b4e4 265 Timer_cycle_mesure.detach();
YSI 0:6b657f74b4e4 266 etat_sht11=5;
YSI 0:6b657f74b4e4 267 Timer_cycle_mesure.attach_us(callback(this, &SHT11::gestion_HT), 1);
YSI 0:6b657f74b4e4 268 }
YSI 0:6b657f74b4e4 269 break;
YSI 0:6b657f74b4e4 270
YSI 0:6b657f74b4e4 271 case 5:
YSI 0:6b657f74b4e4 272 Timer_cycle_mesure.detach();
YSI 0:6b657f74b4e4 273 reception_mesure_H();
YSI 0:6b657f74b4e4 274 calcul_Temperature_Humidite();
YSI 0:6b657f74b4e4 275 etat_sht11=0;
YSI 0:6b657f74b4e4 276 Timer_cycle_mesure.attach(callback(this, &SHT11::gestion_HT), Temps_cycle_mesure);
YSI 0:6b657f74b4e4 277 break;
YSI 0:6b657f74b4e4 278
YSI 0:6b657f74b4e4 279 default:
YSI 0:6b657f74b4e4 280 etat_sht11=0;
YSI 0:6b657f74b4e4 281 break;
YSI 0:6b657f74b4e4 282 }
YSI 0:6b657f74b4e4 283 }
YSI 0:6b657f74b4e4 284
YSI 0:6b657f74b4e4 285 float SHT11::lire_T(void)
YSI 0:6b657f74b4e4 286 {
YSI 0:6b657f74b4e4 287 return Temperature_mesuree;
YSI 0:6b657f74b4e4 288 }
YSI 0:6b657f74b4e4 289
YSI 0:6b657f74b4e4 290 float SHT11::lire_H(void)
YSI 0:6b657f74b4e4 291 {
YSI 0:6b657f74b4e4 292 return Humidite_mesuree;
YSI 0:6b657f74b4e4 293 }
YSI 0:6b657f74b4e4 294
YSI 0:6b657f74b4e4 295 void SHT11::lire_T_H(float *pointeur_Temperature, float *pointeur_Humidite)
YSI 0:6b657f74b4e4 296 {
YSI 0:6b657f74b4e4 297 *pointeur_Temperature = Temperature_mesuree;
YSI 0:6b657f74b4e4 298 *pointeur_Humidite = Humidite_mesuree;
YSI 0:6b657f74b4e4 299 }