Diff: main.cpp

Revision:

0:dc5ba9b9f28a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Feb 09 03:00:27 2015 +0000
@@ -0,0 +1,39 @@
+/* Grove - Temprature Sensor demo v1.0
+*  This sensor detects the enviroment temprature,
+*  Uses a Arch-Pro board with Grove Base Shield
+*  Connect the Grove Temperature sensor to A0 and
+*  connect a Grove 4 digit LED display to the UART connector
+*  The temperature will be displayed in Celcius
+*  Modified by David Bottrill from the original Arduino code
+*  Reference: http://www.seeedstudio.com
+*/
+
+#include "mbed.h"
+#include "DigitDisplay.h"
+
+DigitalOut myled(LED2);
+
+DigitDisplay display(P4_29, P4_28);
+AnalogIn ain(P0_23);
+
+int a;
+float temperature;
+int B=3975;                                                         //B value of the thermistor
+float resistance;
+
+int main()
+{
+    while(1) {
+// multiply ain by 675 if the Grove shield is set to 5V or 1023 if set to 3.3V
+        a=ain*675;
+        resistance=(float)(1023-a)*10000/a;                         //get the resistance of the sensor;
+        temperature=1/(log(resistance/10000)/B+1/298.15)-273.15;    //convert to temperature via datasheet ;
+        myled = 1;
+        wait(0.8);
+        myled = 0;
+        wait(0.8);
+        display.write(temperature);
+    }
+}
+
+