peiyu wang / Grove_temp_sensor

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Dependents:   Grove_Temp_Hello_world

Grove_temp_sensor.cpp

Committer:
peipei123
Date:
2016-03-10
Revision:
5:b7d0479535ab
Parent:
3:2b40039c6e54
Child:
6:2d65df11758a

File content as of revision 5:b7d0479535ab:

#include "mbed.h"
#include "Grove_temp_sensor.h"
//Setup a new class for Grove_temp_sensor sensor

Grove_temp_sensor::Grove_temp_sensor(PinName pin) : _pin(pin)
{
wait(0.5);
}

float Grove_temp_sensor::read_F()
{

        double a;
        a=_pin.read()*1023;
        double resistance=(float)(1023-a)*10000/a;
        double temperature=1/(log(resistance/10000)/3975+1/298.15)-276.05;
        //conver C to F;
        temperature = (9.0*temperature)/5.0 + 32.0;
    return temperature;
}

float Grove_temp_sensor::read_C()
{

        double a;
        a=_pin.read()*1023;
        double resistance=(float)(1023-a)*10000/a;
        double temperature=1/(log(resistance/10000)/3975+1/298.15)-276.05;
    return temperature;
}