Yihui Xiong / Mbed 2 deprecated Arch_Display_Temperature

A digital thermometer

Dependencies:   DigitDisplay mbed

main.cpp@0:9fd28909b48d, 2014-04-28 (annotated)

Committer:
yihui
Date:
Mon Apr 28 01:11:23 2014 +0000
Revision:
0:9fd28909b48d
initial

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yihui 0:9fd28909b48d 1 #include "mbed.h"
yihui 0:9fd28909b48d 2 #include "DigitDisplay.h"
yihui 0:9fd28909b48d 3
yihui 0:9fd28909b48d 4 DigitDisplay display(P1_14, P1_13); // 4-Digit Display connected to UART Grove connector
yihui 0:9fd28909b48d 5 AnalogIn thermistor(P0_12); // Thermistor output connected to P0_12
yihui 0:9fd28909b48d 6
yihui 0:9fd28909b48d 7 int main() {
yihui 0:9fd28909b48d 8 unsigned int a;
yihui 0:9fd28909b48d 9 unsigned int beta = 3975;
yihui 0:9fd28909b48d 10 float temperature, resistance;
yihui 0:9fd28909b48d 11
yihui 0:9fd28909b48d 12 while(1) {
yihui 0:9fd28909b48d 13 a = thermistor.read_u16(); /* Read analog value */
yihui 0:9fd28909b48d 14
yihui 0:9fd28909b48d 15 /* Calculate the resistance of the thermistor from analog votage read. */
yihui 0:9fd28909b48d 16 resistance= (float) 10000.0 * ((65536.0 / a) - 1.0);
yihui 0:9fd28909b48d 17
yihui 0:9fd28909b48d 18 /* Convert the resistance to temperature using Steinhart's Hart equation */
yihui 0:9fd28909b48d 19 temperature = (1/((log(resistance/10000.0)/beta) + (1.0/298.15)))-273.15;
yihui 0:9fd28909b48d 20
yihui 0:9fd28909b48d 21 display = (int)temperature;
yihui 0:9fd28909b48d 22
yihui 0:9fd28909b48d 23 wait(0.5);
yihui 0:9fd28909b48d 24 }
yihui 0:9fd28909b48d 25 }