Nathan Yonkee / Mbed OS Seeed_Grove_4_Digit_Display_Clock

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Dependencies:   Data_Clock_Pair Seeed_Chainable_LED Seeed_Four_Digit_Disp Seeed_IR_Temp_Sensor Seeed_Led_Bar

Fork of Seeed_Grove_4_Digit_Display_Clock by Seeed

SeeedIRTempSensor.h@16:cebc9f55d2a6, 2017-05-18 (annotated)

Committer:
tulanthoar
Date:
Thu May 18 10:48:12 2017 -0600
Revision:
16:cebc9f55d2a6
supplimental files to previous commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
tulanthoar 16:cebc9f55d2a6 1 /* #include <cmath> */
tulanthoar 16:cebc9f55d2a6 2 #include "mbed.h"
tulanthoar 16:cebc9f55d2a6 3 namespace IRTempSensor{
tulanthoar 16:cebc9f55d2a6 4 #define SUR_TEMP_PIN PA_3 // Analog input pin connect to temperature sensor SUR pin
tulanthoar 16:cebc9f55d2a6 5 #define OBJ_TEMP_PIN PC_0 // Analog input pin connect to temperature sensor OBJ pin
tulanthoar 16:cebc9f55d2a6 6
tulanthoar 16:cebc9f55d2a6 7 double measuresureTemp(PinName surPin) {
tulanthoar 16:cebc9f55d2a6 8 AnalogIn surTPin(surPin);
tulanthoar 16:cebc9f55d2a6 9 float volts, resistance, temperature;
tulanthoar 16:cebc9f55d2a6 10 volts = 0;
tulanthoar 16:cebc9f55d2a6 11 for (int i = 0; i < 100; i++) {
tulanthoar 16:cebc9f55d2a6 12 volts += surTPin.read();
tulanthoar 16:cebc9f55d2a6 13 wait_us(10);
tulanthoar 16:cebc9f55d2a6 14 }
tulanthoar 16:cebc9f55d2a6 15 volts *= 3.3/100;
tulanthoar 16:cebc9f55d2a6 16 resistance = 2000000*volts/(2.5-volts);
tulanthoar 16:cebc9f55d2a6 17 temperature = 1/(log(resistance/100000)/3964 +(1/298.15)) - 273.15;
tulanthoar 16:cebc9f55d2a6 18 return temperature;
tulanthoar 16:cebc9f55d2a6 19 }
tulanthoar 16:cebc9f55d2a6 20
tulanthoar 16:cebc9f55d2a6 21 float measureObjectTemp(PinName surPin, PinName objPin) {
tulanthoar 16:cebc9f55d2a6 22 AnalogIn objTPin(objPin);
tulanthoar 16:cebc9f55d2a6 23 float objV = 0;
tulanthoar 16:cebc9f55d2a6 24 for (int i = 0; i < 100; i++) {
tulanthoar 16:cebc9f55d2a6 25 objV += objTPin.read();
tulanthoar 16:cebc9f55d2a6 26 wait_us(10);
tulanthoar 16:cebc9f55d2a6 27 }
tulanthoar 16:cebc9f55d2a6 28 objV *= 3.3/100;
tulanthoar 16:cebc9f55d2a6 29 /* float pileSignal= objV - 2.5*17.4/(17.4+64); */
tulanthoar 16:cebc9f55d2a6 30 float pileSignal = objV - 0.52;
tulanthoar 16:cebc9f55d2a6 31 pileSignal *= 0.01;
tulanthoar 16:cebc9f55d2a6 32 float ts = measuresureTemp(surPin) + 273.15;
tulanthoar 16:cebc9f55d2a6 33 /* float calib = 1+(298.15 - ts)*0.0011; */
tulanthoar 16:cebc9f55d2a6 34 float calib = 1;
tulanthoar 16:cebc9f55d2a6 35 float k = 3.45*pow(10,-13)*calib;
tulanthoar 16:cebc9f55d2a6 36 float kRecip = 2976078405624.9985;
tulanthoar 16:cebc9f55d2a6 37 float kRecipAmp = kRecip * 0.01;
tulanthoar 16:cebc9f55d2a6 38 /* float objT = (pileSignal*kRecip + ts*ts*ts*ts); */
tulanthoar 16:cebc9f55d2a6 39 float objT = (objV*kRecipAmp -0.51*kRecipAmp + ts*ts*ts*ts);
tulanthoar 16:cebc9f55d2a6 40 return pow(objT,0.25) - 273.15;
tulanthoar 16:cebc9f55d2a6 41 /* return pileSignal*1000; */
tulanthoar 16:cebc9f55d2a6 42 /* return objV*100; */
tulanthoar 16:cebc9f55d2a6 43 }};