Saudin Dizdarevic / Mbed 2 deprecated tempsensors

This program read temperature using two LM35 sensors on A0 and A1 analog inputs and displays average temperature using serial. Also, if the temp is in the range (18,22) C then the green led is on, if the temp is in the range (16,18) and (22,24) C the blue led is on, else red led will be on. You can see the connection diagram on my blog sdizdarevic.com soon.

Dependencies:   mbed

main.cpp@0:cd3e218305bb, 2014-08-06 (annotated)

Committer:
sdizdarevic
Date:
Wed Aug 06 13:03:00 2014 +0000
Revision:
0:cd3e218305bb
Program to read and display temperature using two LM35 temperature sensors

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sdizdarevic 0:cd3e218305bb 1 /*
sdizdarevic 0:cd3e218305bb 2 This program read temperature using two LM35
sdizdarevic 0:cd3e218305bb 3 sensors on A0 and A1 analog inputs and displays
sdizdarevic 0:cd3e218305bb 4 average temperature using serial
sdizdarevic 0:cd3e218305bb 5 Also, if the temp is in the range (18,22) C then
sdizdarevic 0:cd3e218305bb 6 the green led is on, if the temp is in the range
sdizdarevic 0:cd3e218305bb 7 (16,18) and (22,24) C the blue led is on, else
sdizdarevic 0:cd3e218305bb 8 red led will be on.
sdizdarevic 0:cd3e218305bb 9 You can see the connection diagram on my blog
sdizdarevic 0:cd3e218305bb 10 sdizdarevic.com soon
sdizdarevic 0:cd3e218305bb 11 */
sdizdarevic 0:cd3e218305bb 12
sdizdarevic 0:cd3e218305bb 13
sdizdarevic 0:cd3e218305bb 14 #include "mbed.h"
sdizdarevic 0:cd3e218305bb 15 DigitalOut red(LED_RED); // Red led
sdizdarevic 0:cd3e218305bb 16 DigitalOut blue(LED_BLUE); //blue led
sdizdarevic 0:cd3e218305bb 17 DigitalOut green(LED_GREEN); // green LED
sdizdarevic 0:cd3e218305bb 18 AnalogIn T1(PTB2); // temperature sensor T1 on A0
sdizdarevic 0:cd3e218305bb 19 AnalogIn T2(PTB3); // temperature sensor T2 on A1
sdizdarevic 0:cd3e218305bb 20 float T; // average temperature
sdizdarevic 0:cd3e218305bb 21 float tempF; //average temperature in Fahrenheit
sdizdarevic 0:cd3e218305bb 22 float K=3.3*100; // scaling coefficient for calculating
sdizdarevic 0:cd3e218305bb 23 // analog value to temperature
sdizdarevic 0:cd3e218305bb 24
sdizdarevic 0:cd3e218305bb 25 Serial pc(USBTX,USBRX); // print temperature on console (eg. Putty)
sdizdarevic 0:cd3e218305bb 26
sdizdarevic 0:cd3e218305bb 27
sdizdarevic 0:cd3e218305bb 28 int main() {
sdizdarevic 0:cd3e218305bb 29 pc.printf("LM35 temperature sensor\n");
sdizdarevic 0:cd3e218305bb 30
sdizdarevic 0:cd3e218305bb 31 while(1) {
sdizdarevic 0:cd3e218305bb 32 red=0;//red=0;
sdizdarevic 0:cd3e218305bb 33 blue=0; //blue=0;
sdizdarevic 0:cd3e218305bb 34 green=0; //green=0;
sdizdarevic 0:cd3e218305bb 35 T=(T1+T1)/2.*K; // average temperature value in Celsius (C)
sdizdarevic 0:cd3e218305bb 36
sdizdarevic 0:cd3e218305bb 37
sdizdarevic 0:cd3e218305bb 38 tempF=(9.0*T)/5.0 + 32.0; //average temperature value in fahrenheit (F)
sdizdarevic 0:cd3e218305bb 39
sdizdarevic 0:cd3e218305bb 40
sdizdarevic 0:cd3e218305bb 41
sdizdarevic 0:cd3e218305bb 42 wait(0.2f); //wait a little
sdizdarevic 0:cd3e218305bb 43 pc.printf("Temperature (in Celsius) is %4.2f \r\n",T);
sdizdarevic 0:cd3e218305bb 44
sdizdarevic 0:cd3e218305bb 45
sdizdarevic 0:cd3e218305bb 46 wait(0.2f); //wait a little
sdizdarevic 0:cd3e218305bb 47 pc.printf("Temperature (in Fahrenheit) is %4.2f \r\n",tempF);
sdizdarevic 0:cd3e218305bb 48
sdizdarevic 0:cd3e218305bb 49
sdizdarevic 0:cd3e218305bb 50 if ( T>=18 && T<=22 ) green=1;
sdizdarevic 0:cd3e218305bb 51 else if ((T>=16 && T<18)||(T>22 && T<=24)) blue=1;
sdizdarevic 0:cd3e218305bb 52 else red=1;
sdizdarevic 0:cd3e218305bb 53 wait(0.2);
sdizdarevic 0:cd3e218305bb 54
sdizdarevic 0:cd3e218305bb 55 }
sdizdarevic 0:cd3e218305bb 56 }