Diff: main.cpp

Revision:

0:9fd28909b48d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Apr 28 01:11:23 2014 +0000
@@ -0,0 +1,25 @@
+#include "mbed.h"
+#include "DigitDisplay.h"
+
+DigitDisplay display(P1_14, P1_13); // 4-Digit Display connected to UART Grove connector
+AnalogIn thermistor(P0_12);         // Thermistor output connected to P0_12
+
+int main() {
+    unsigned int a;
+    unsigned int beta = 3975;
+    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; 
+        
+        display = (int)temperature;
+      
+        wait(0.5);
+    }
+}