Yihui Xiong
/
Arch_Analog_Thermistor_Blinker
Temperature Sensing
Fork of Arch_Analog_Thermistor_Blinker by
main.cpp
- Committer:
- yihui
- Date:
- 2014-08-20
- Revision:
- 7:5c2ade6745ae
- Parent:
- 6:914bd412ceda
File content as of revision 7:5c2ade6745ae:
#include "mbed.h" AnalogIn thermistor(A1); /* Temperature sensor connected to Analog Grove connector */ DigitalOut tensplaceLED(LED4); /* This led blinks as per tens place of temperature value(in deg C) */ DigitalOut unitsplaceLED(LED1); /* This led blinks as per units place of temperature value(in deg C) */ int main() { unsigned int a, beta = 3975, units, tens; float temperature, resistance; while(1) { a = thermistor.read_u16(); /* Read analog value */ /* Calculate the resistance of the thermistor from analog votage read. */ resistance= (float) 10000.0 * ((65536.0 / a) - 1.0); /* Convert the resistance to temperature using Steinhart's Hart equation */ temperature=(1/((log(resistance/10000.0)/beta) + (1.0/298.15)))-273.15; units = (int) temperature % 10; tens = (int) temperature / 10; for(int i=0; i< tens; i++) { tensplaceLED = 1; wait(.200); tensplaceLED = 0; wait(.200); } for(int i=0; i< units; i++) { unitsplaceLED = 1; wait(.200); unitsplaceLED = 0; wait(.200); } wait(0.5); } }