MSOE EE2905 / Mbed 2 deprecated Audible_Thermometer

Thermometer (using thermistor) that creates beeps of increasing pitch and pulse rate as temperature rises above nominal. Demonstrates use of #include for your own header files, and #define for constants.

Dependencies:   mbed

main.cpp@0:59f09202ccbb, 2017-10-05 (annotated)

Committer:
rossatmsoe
Date:
Thu Oct 05 20:02:27 2017 +0000
Revision:
0:59f09202ccbb
Thermometer (using thermistor) that creates beeps of increasing pitch and pulse rate as temperature rises above nominal.  Demonstrates use of #include for your own header files, and #define for constants.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rossatmsoe 0:59f09202ccbb 1 /* Audible Thermometer
rossatmsoe 0:59f09202ccbb 2
rossatmsoe 0:59f09202ccbb 3 Creates beeps of increasing pitch and pulse rate as the temperature
rossatmsoe 0:59f09202ccbb 4 rises above the nominal value.
rossatmsoe 0:59f09202ccbb 5
rossatmsoe 0:59f09202ccbb 6 Hardware: 10k resistor from A0 to ground
rossatmsoe 0:59f09202ccbb 7 10k nominal thermistor from A0 to 3V3
rossatmsoe 0:59f09202ccbb 8 Speaker from D9 to ground
rossatmsoe 0:59f09202ccbb 9
rossatmsoe 0:59f09202ccbb 10 */
rossatmsoe 0:59f09202ccbb 11
rossatmsoe 0:59f09202ccbb 12 #include "mbed.h"
rossatmsoe 0:59f09202ccbb 13 #include "thermistor.h" // This file contains the temperature calculation
rossatmsoe 0:59f09202ccbb 14
rossatmsoe 0:59f09202ccbb 15 #define NOMINAL_TEMP 75 // Change the nominal temperature here
rossatmsoe 0:59f09202ccbb 16
rossatmsoe 0:59f09202ccbb 17 AnalogIn therm(A0);
rossatmsoe 0:59f09202ccbb 18 PwmOut speaker(D9);
rossatmsoe 0:59f09202ccbb 19 Serial pc(USBTX,USBRX);
rossatmsoe 0:59f09202ccbb 20
rossatmsoe 0:59f09202ccbb 21 // This function will be defined in this file, main.cpp
rossatmsoe 0:59f09202ccbb 22 void beep(float freq, float duration);
rossatmsoe 0:59f09202ccbb 23
rossatmsoe 0:59f09202ccbb 24 int main()
rossatmsoe 0:59f09202ccbb 25 {
rossatmsoe 0:59f09202ccbb 26 while(1) {
rossatmsoe 0:59f09202ccbb 27
rossatmsoe 0:59f09202ccbb 28 // Calculate Temperature
rossatmsoe 0:59f09202ccbb 29 int tempF = temp_calc(therm); // This function is in thermistor.h
rossatmsoe 0:59f09202ccbb 30
rossatmsoe 0:59f09202ccbb 31 // Calculate difference from nominal
rossatmsoe 0:59f09202ccbb 32 int difference = tempF-NOMINAL_TEMP;
rossatmsoe 0:59f09202ccbb 33
rossatmsoe 0:59f09202ccbb 34 // If I have a fever...
rossatmsoe 0:59f09202ccbb 35 if (difference >= 1) {
rossatmsoe 0:59f09202ccbb 36
rossatmsoe 0:59f09202ccbb 37 // Create a warning beep that gets higher in pitch and
rossatmsoe 0:59f09202ccbb 38 // more rapid as temperature increases
rossatmsoe 0:59f09202ccbb 39 float frequency = difference*100;
rossatmsoe 0:59f09202ccbb 40 float duration = .5/difference;
rossatmsoe 0:59f09202ccbb 41
rossatmsoe 0:59f09202ccbb 42 // Call beeping function defined below
rossatmsoe 0:59f09202ccbb 43 beep(frequency,duration);
rossatmsoe 0:59f09202ccbb 44
rossatmsoe 0:59f09202ccbb 45 wait(duration);
rossatmsoe 0:59f09202ccbb 46 }
rossatmsoe 0:59f09202ccbb 47 }
rossatmsoe 0:59f09202ccbb 48 }
rossatmsoe 0:59f09202ccbb 49
rossatmsoe 0:59f09202ccbb 50 void beep(float freq, float duration) // Note that one of the variables
rossatmsoe 0:59f09202ccbb 51 { // in the note() function has the same
rossatmsoe 0:59f09202ccbb 52 speaker.period(1/freq); // as a variable in main().
rossatmsoe 0:59f09202ccbb 53 speaker=.5; // That's ok, since they are local
rossatmsoe 0:59f09202ccbb 54 wait(duration); // to their respective functions.
rossatmsoe 0:59f09202ccbb 55 speaker=0; // This function also uses a global
rossatmsoe 0:59f09202ccbb 56 } // variable, speaker.
rossatmsoe 0:59f09202ccbb 57