Grove - Infrared Temperature Sensor

Exempelkod

Arduino

<syntaxhighlight="C++" lang> /****************************************************************************/ // Function: Measure the measure the Surrounding temperature around the sensor // and the temperature of the target which is in front of the sensor. // And print the result on the serial monitor. // Hardware: Grove - Infrared Temperature Sensor // Arduino IDE: Arduino-1.0 // Author: Bruce.Qin // Date: Nov 28,2011 // Version: v1.0 modified by FrankieChu at Jan 24,2013 // by www.seeedstudio.com // // This library is free software; you can redistribute it and/or // modify it under the terms of the GNU Lesser General Public // License as published by the Free Software Foundation; either // version 2.1 of the License, or (at your option) any later version. // // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU // Lesser General Public License for more details. // // You should have received a copy of the GNU Lesser General Public // License along with this library; if not, write to the Free Software // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA // /******************************************************************************/

1. include <math.h>

1. define SUR_TEMP_PIN A0 // Analog input pin connect to temperature sensor SUR pin
2. define OBJ_TEMP_PIN A1 // Analog input pin connect to temperature sensor OBJ pin

float temp_calibration=0; //this parameter was used to calibrate the temperature //float objt_calibration=0.000; //this parameter was used to calibrate the object temperature float temperature_range=10; //we make a map of temperature-voltage according to sensor datasheet. 10 is the temperature step when sensor and

                              //object distance is 9CM.

float offset_vol=0.014; //this parameter was used to set the mid level voltage,when put the sensor in normal environment after 10 min,

                              //the sensor output 0.For example,the surrounding temperature is 29℃，but the result is 27℃ via the sensor,
                              //you should set the reerence to 0.520 or more,according to your sensor to change.
                              //the unit is V

float tempValue = 0; float objtValue= 0; float current_temp=0; float temp=0; float temp1=0; float temp2=0; unsigned int temp3=0; const float reference_vol=0.500; unsigned char clear_num=0;//when use lcd to display float R=0; float voltage=0;

long res[100]={

                318300,302903,288329,274533,261471,249100,237381,226276,215750,205768,
                196300,187316,178788,170691,163002,155700,148766,142183,135936,130012,
                124400,119038,113928,109059,104420,100000,95788,91775,87950,84305,
                80830,77517,74357,71342,68466,65720,63098,60595,58202,55916,
                53730,51645,49652,47746,45924,44180,42511,40912,39380,37910,
                36500,35155,33866,32631,31446,30311,29222,28177,27175,26213,
                25290,24403,23554,22738,21955,21202,20479,19783,19115,18472,
                17260,16688,16138,15608,15098,14608,14135,13680,13242,12819,
                12412,12020,11642,11278,10926,10587,10260,9945,9641,9347,
                9063,8789,8525,8270,8023,7785,7555,7333,7118,6911};
                

float obj [13][12]={ /*0*/ { 0,-0.274,-0.58,-0.922,-1.301,-1.721,-2.183,-2.691,-3.247,-3.854,-4.516,-5.236}, // /*1*/ { 0.271,0,-0.303,-0.642,-1.018,-1.434,-1.894,-2.398,-2.951,-3.556,-4.215,-4.931}, //→surrounding temperature,from -10,0,10,...100 /*2*/ { 0.567,0.3,0,-0.335,-0.708,-1.121,-1.577,-2.078,-2.628,-3.229,-3.884,-4.597}, //↓object temperature,from -10,0,10,...110 /*3*/ { 0.891,0.628,0.331,0,-0.369,-0.778,-1.23,-1.728,-2.274,-2.871,-3.523,-4.232}, /*4*/ { 1.244,0.985,0.692,0.365,0,-0.405,-0.853,-1.347,-1.889,-2.482,-3.13,-3.835}, /*5*/ { 1.628,1.372,1.084,0.761,0.401,0,-0.444,-0.933,-1.47,-2.059,-2.702,-3.403}, /*6*/ { 2.043,1.792,1.509,1.191,0.835,0.439,0,-0.484,-1.017,-1.601,-2.24,-2.936}, /*7*/ { 2.491,2.246,1.968,1.655,1.304,0.913,0.479,0,-0.528,-1.107,-1.74,-2.431}, /*8*/ { 2.975,2.735,2.462,2.155,1.809,1.424,0.996,0.522,0,-0.573,-1.201,-1.887}, /*9*/ { 3.495,3.261,2.994,2.692,2.353,1.974,1.552,1.084,0.568,0,-0.622,-1.301}, /*10*/ { 4.053,3.825,3.565,3.27,2.937,2.564,2.148,1.687,1.177,0.616,0,-0.673}, /*11*/ { 4.651,4.43,4.177,3.888,3.562,3.196,2.787,2.332,1.829,1.275,0.666,0}, /*12*/ { 5.29,5.076,4.83,4.549,4.231,3.872,3.47,3.023,2.527,1.98,1.379,0.72} };

void setup() { Serial.begin(9600); // initialize serial communications at 9600 bps analogReference(INTERNAL);//set the refenrence voltage 1.1V,the distinguishability can up to 1mV. //analogReference(INTERNAL1V1);//(mega only)set the refenrence voltage 1.1V,the distinguishability can up to 1mV. } void loop() { measureSurTemp();//measure the Surrounding temperature around the sensor measureObjectTemp(); }

float binSearch(long x)// this function used for measure the surrounding temperature { int low,mid,high; low=0; //mid=0; high=100; while (low<=high) { mid=(low+high)/2; if(x<res[mid]) low= mid+1; else//(x>res[mid]) high=mid-1; } return mid; }

float arraysearch(float x,float y)//x is the surrounding temperature,y is the object temperature { int i=0; float tem_coefficient=100;//Magnification of 100 times i=(x/10)+1;//Ambient temperature voltage=(float)y/tem_coefficient;//the original voltage //Serial.print("sensor voltage:\t"); //Serial.print(voltage,5); //Serial.print("V"); for(temp3=0;temp3<13;temp3++) { if((voltage>obj[temp3][i])&&(voltage<obj[temp3+1][i])) { return temp3; } } } float measureSurTemp() { unsigned char i=0; float current_temp1=0; int signal=0; tempValue=0;

for(i=0;i<10;i++) // { tempValue+= analogRead(SUR_TEMP_PIN); delay(10); } tempValue=tempValue/10; temp = tempValue*1.1/1023; R=2000000*temp/(2.50-temp); signal=binSearch(R); current_temp=signal-1+temp_calibration+(res[signal-1]-R)/(res[signal-1]-res[signal]); Serial.print("Surrounding temperature:"); Serial.print(current_temp); return current_temp; }

float measureObjectTemp() { unsigned char i=0; unsigned char j=0; float sur_temp=0; unsigned int array_temp=0; float temp1,temp2; float final_temp=0; objtValue=0; for(i=0;i<10;i++) { objtValue+= analogRead(OBJ_TEMP_PIN); delay(10);

   }       

objtValue=objtValue/10;//Averaging processing temp1=objtValue*1.1/1023;//+objt_calibration; sur_temp=temp1-(reference_vol+offset_vol); Serial.print("\t Sensor voltage:"); Serial.print(sur_temp,3); Serial.print("V"); array_temp=arraysearch(current_temp,sur_temp*1000); temp2=current_temp; temp1=(temperature_range*voltage)/(obj[array_temp+1][(int)(temp2/10)+1]-obj[array_temp][(int)(temp2/10)+1]); final_temp=temp2+temp1; if((final_temp>100)||(final_temp<=-10)) { Serial.println ("\t out of range!"); } else { Serial.print("\t object temperature:"); Serial.println(final_temp,2); } } </syntaxhighlight>

Mer information

http://wiki.seeedstudio.com/Grove-Infrared_Temperature_Sensor/