Yeffry Zakizon / Mbed 2 deprecated mbed_lpc1768_tempSensor

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Dependencies:   mbed

main.cpp@0:83dfc83e48bf, 2013-11-06 (annotated)

Committer:
yzakizon
Date:
Wed Nov 06 07:31:40 2013 +0000
Revision:
0:83dfc83e48bf
Initial release to get MCP9700 temperature sensor

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yzakizon 0:83dfc83e48bf 1 #include "mbed.h"
yzakizon 0:83dfc83e48bf 2
yzakizon 0:83dfc83e48bf 3 DigitalOut myled(LED1);
yzakizon 0:83dfc83e48bf 4 Serial pc(USBTX, USBRX);
yzakizon 0:83dfc83e48bf 5 AnalogIn tempPin(p15);
yzakizon 0:83dfc83e48bf 6
yzakizon 0:83dfc83e48bf 7 float tempTotal;
yzakizon 0:83dfc83e48bf 8 uint32_t tempDiv;
yzakizon 0:83dfc83e48bf 9
yzakizon 0:83dfc83e48bf 10 #define MAX_TEMP_AVG 10
yzakizon 0:83dfc83e48bf 11
yzakizon 0:83dfc83e48bf 12 void sampleTemperature();
yzakizon 0:83dfc83e48bf 13 void sampleTemperatures();
yzakizon 0:83dfc83e48bf 14 void resetTemperatureSamples();
yzakizon 0:83dfc83e48bf 15 float getAvgTemperature();
yzakizon 0:83dfc83e48bf 16
yzakizon 0:83dfc83e48bf 17 void sampleTemperature()
yzakizon 0:83dfc83e48bf 18 {
yzakizon 0:83dfc83e48bf 19 tempTotal += tempPin; //we use 3.3V from VOUT
yzakizon 0:83dfc83e48bf 20 tempDiv++;
yzakizon 0:83dfc83e48bf 21 }
yzakizon 0:83dfc83e48bf 22
yzakizon 0:83dfc83e48bf 23 void sampleTemperatures()
yzakizon 0:83dfc83e48bf 24 {
yzakizon 0:83dfc83e48bf 25 for(int i=0;i<MAX_TEMP_AVG;i++) {
yzakizon 0:83dfc83e48bf 26 sampleTemperature();
yzakizon 0:83dfc83e48bf 27 wait(0.1);
yzakizon 0:83dfc83e48bf 28 }
yzakizon 0:83dfc83e48bf 29 }
yzakizon 0:83dfc83e48bf 30
yzakizon 0:83dfc83e48bf 31 void resetTemperatureSamples()
yzakizon 0:83dfc83e48bf 32 {
yzakizon 0:83dfc83e48bf 33 tempTotal = 0.0;
yzakizon 0:83dfc83e48bf 34 tempDiv = 0;
yzakizon 0:83dfc83e48bf 35 }
yzakizon 0:83dfc83e48bf 36 float getAvgTemperature()
yzakizon 0:83dfc83e48bf 37 {
yzakizon 0:83dfc83e48bf 38 /* Temperature calculations is (VOut - V0)/Tc
yzakizon 0:83dfc83e48bf 39 * VOut = V out from sensor
yzakizon 0:83dfc83e48bf 40 * V0 = Voltage on 0 Celcius, 500mv for MCP9700
yzakizon 0:83dfc83e48bf 41 * Tc = Temperatur constant, 10mV/C
yzakizon 0:83dfc83e48bf 42 */
yzakizon 0:83dfc83e48bf 43 float tempAvg = (((tempTotal*3300)/(float)tempDiv)-500.0)/10.0;
yzakizon 0:83dfc83e48bf 44 return tempAvg;
yzakizon 0:83dfc83e48bf 45 }
yzakizon 0:83dfc83e48bf 46
yzakizon 0:83dfc83e48bf 47 int main() {
yzakizon 0:83dfc83e48bf 48 tempDiv = 0;
yzakizon 0:83dfc83e48bf 49 pc.printf("MBED ready..\r\n");
yzakizon 0:83dfc83e48bf 50 sampleTemperatures();
yzakizon 0:83dfc83e48bf 51 pc.printf("Temp: %.2f.\r\n",getAvgTemperature());
yzakizon 0:83dfc83e48bf 52 while(1) {
yzakizon 0:83dfc83e48bf 53 sampleTemperature();
yzakizon 0:83dfc83e48bf 54
yzakizon 0:83dfc83e48bf 55 myled = 1;
yzakizon 0:83dfc83e48bf 56 wait(0.5);
yzakizon 0:83dfc83e48bf 57 myled = 0;
yzakizon 0:83dfc83e48bf 58 wait(0.5);
yzakizon 0:83dfc83e48bf 59
yzakizon 0:83dfc83e48bf 60 if (tempDiv > MAX_TEMP_AVG) {
yzakizon 0:83dfc83e48bf 61 pc.printf("Temp: %.2f.\r\n",getAvgTemperature());
yzakizon 0:83dfc83e48bf 62 resetTemperatureSamples();
yzakizon 0:83dfc83e48bf 63 }
yzakizon 0:83dfc83e48bf 64 }
yzakizon 0:83dfc83e48bf 65 }