main.cpp

00001 #include "mbed.h"
00002 #include "SoftSerialSendOnry.h"
00003 
00004 AnalogIn thermistor(dp13);   /* Temperature sensor connected to Analog Grove connector */
00005 
00006 SoftSerialSendOnry pc(dp10); // tx
00007 
00008 int main()
00009 {
00010     unsigned int a, beta = 3975, units, tens;
00011     float temperature, resistance;
00012 
00013     while(1) {
00014         a = thermistor.read_u16(); /* Read analog value */
00015         
00016         /* Calculate the resistance of the thermistor from analog votage read. */
00017         resistance= (float) 10000.0 * ((65536.0 / a) - 1.0);
00018         
00019         /* Convert the resistance to temperature using Steinhart's Hart equation */
00020         temperature=(1/((log(resistance/10000.0)/beta) + (1.0/298.15)))-273.15; 
00021         
00022         pc.printf("temp=%f\r\n",temperature);
00023       
00024         wait(0.5);
00025     }
00026 }
00027