adding save and battery voltage reading

main/main.c

@@ -28,6 +28,7 @@
 #include "gpio.h"
 #include "keypad.h"
 #include "system.h"
+#include "battery.h"
 
 
 
@@ -313,10 +314,15 @@ void app_main(void)
     bt_app_init();
     print_heap_info("POST_BLUETOOTH");
 
+    // Initialize battery monitoring
+    ESP_ERROR_CHECK(battery_init());
+    battery_start_monitoring_task();
+    print_heap_info("POST_BATTERY");
+
     gpio_set_level(PIN_NUM_LED_0, 1);
             gpio_set_level(PIN_NUM_LED_1, 1);
             gpio_set_level(PIN_NUM_LED_2, 1);
-            
+
     gui_start();
     print_heap_info("POST_GUI");
     gpio_set_level(PIN_NUM_LED_2, 1);