Diff: main.cpp

Revision:

0:9f5cbd8850f2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Nov 18 15:32:38 2015 +0000
@@ -0,0 +1,29 @@
+/** 05_analog_thermometer2
+ * Measeures the temperature by using a Microchip MCP9700A
+ * analog thermometer (parameteres: 10 mV/C, 500 mV offset, VCC= 2.3-5.5V)
+ * Averaged result is printed to standard output.
+ *
+ * Hardware requirements:
+ *  - FRDM-KL25Z board
+ *  - MCP9700A analog thermometer connected to A0 (PTB0)
+ */
+
+#include "mbed.h"
+
+AnalogIn ain(A0);                           // Analog input at PTB0
+uint32_t mysum;                             // Used for summation
+
+int main()
+{
+    printf("\r\n05_analog_thermometer2 - with averaging\r\n");
+    while(1) {
+        mysum = 0; 
+        for(int i=0; i<3300; i++) {
+            mysum += ain.read_u16();        // sum up raw 16-bit data
+        }    
+        float voltage = mysum>>16;          // voltage in millivolts
+        float tempC = (voltage -500)/10;    // tempereature in Celsius
+        printf("voltage: %5.0f mV temp: %5.1f C\r\n",voltage,tempC);
+        wait(2);
+    }
+}