05_analog_thermometer

Diff: main.cpp

Revision:

0:d5f4c581840b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Nov 18 15:31:37 2015 +0000
@@ -0,0 +1,25 @@
+/** 05_analog_thermometer
+ * Measeures the temperature by using a Microchip MCP9700A
+ * analog thermometer (parameteres: 10 mV/C, 500 mV offset, VCC= 2.3-5.5V)
+ * 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
+
+int main()
+{
+    printf("\r\n05_analog_thermometer program\r\n");
+    while(1) {
+        uint16_t raw = ain.read_u16();      // read raw 16-bit data
+        float voltage = ain.read()*3300;    // read voltage in millivolts
+        float tempC = (voltage -500)/10;    // tempereature in Celsius
+        printf("ADC: 0x%04X voltage: %5.0f temp: %5.1f C\r\n",raw,voltage,tempC);
+        wait(2);
+    }
+}