Adding an example application for battery sensor

platform/micaz/apps/battery-monitor.c

@@ -0,0 +1,34 @@
+#include "contiki.h"
+#include "dev/battery-sensor.h"
+#include "lib/sensors.h"
+#include <stdio.h> /* For printf() */
+/*---------------------------------------------------------------------------*/
+PROCESS(battery_monitor_process, "Battery Voltage Monitor");
+AUTOSTART_PROCESSES(&battery_monitor_process);
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(battery_monitor_process, ev, data)
+{
+  static struct etimer et;
+
+  PROCESS_BEGIN();
+
+  SENSORS_ACTIVATE(battery_sensor);
+
+  while(1) {
+
+    etimer_set(&et, CLOCK_SECOND * 2);
+    PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&et));
+    /*
+     * Battery voltage calculation formula
+     *
+     *     V(Battery Voltage) = v(Voltage Reference) * 1024 / ADC
+     *
+     *     Where:
+     *          v = 1.223
+     * 
+     */
+    printf("ADC value : %d\n", battery_sensor.value(0));
+  }
+  PROCESS_END();
+}
+/*---------------------------------------------------------------------------*/