diff --git a/ch32v-insert-coin/src/app.rs b/ch32v-insert-coin/src/app.rs
index 5775a60..f2e46c0 100644
--- a/ch32v-insert-coin/src/app.rs
+++ b/ch32v-insert-coin/src/app.rs
@@ -193,6 +193,7 @@ pub struct TimerConfig {
     pub usb_adc_timer_ms: usize,
     pub led0_timer_ms: usize,
     pub led1_timer_ms: usize,
+    pub shutdown_timer_ms: usize,
     // pub led2_timer_ms: usize,
 }
 
@@ -203,6 +204,7 @@ pub struct Timers {
     usb_adc_timer: TickTimerService,
     led0_timer: TickTimerService,
     led1_timer: TickTimerService,
+    shutdown_timer: TickTimerService,
     // led2_timer: TickTimerService,
 }
 
@@ -233,10 +235,13 @@ impl Timers {
                 TickServiceData::new(config.led1_timer_ms * system_tick_rate_hz / 1000),
                 true,
             ),
-            // led2_timer: TickTimerService::new(
-            //     TickServiceData::new(config.led2_timer_ms * system_tick_rate_hz / 1000),
-            //     true,
-            // ),
+            shutdown_timer: TickTimerService::new(
+                TickServiceData::new(config.shutdown_timer_ms * system_tick_rate_hz / 1000),
+                false,
+            ), // led2_timer: TickTimerService::new(
+               //     TickServiceData::new(config.led2_timer_ms * system_tick_rate_hz / 1000),
+               //     true,
+               // ),
         }
     }
     pub fn tick(&mut self) {
@@ -246,6 +251,7 @@ impl Timers {
         self.usb_adc_timer.tick();
         self.led0_timer.tick();
         self.led1_timer.tick();
+        self.shutdown_timer.tick();
         // self.led2_timer.tick();
     }
     pub fn need_service(&self) -> bool {
@@ -255,6 +261,7 @@ impl Timers {
             | self.usb_adc_timer.need_service()
             | self.led0_timer.need_service()
             | self.led1_timer.need_service()
+            | self.shutdown_timer.need_service()
         // | self.led2_timer.need_service()
     }
     pub fn init(&mut self) {
@@ -345,6 +352,9 @@ impl App {
         self.timers.led1_timer.reset();
         self.timers.led1_timer.enable(true);
 
+        self.timers.shutdown_timer.reset();
+        self.timers.shutdown_timer.enable(true);
+
         // self.timers.led2_timer.reset();
         // self.timers.led2_timer.enable(true);
 
@@ -394,14 +404,8 @@ impl App {
             // #[cfg(feature = "enable_print")]
             // println!("batt adc service: {bv}, {avg}");
             if avg < 421 {
-                // self.services
-                // .sequencer
-                // .play_sequence(&crate::sequences::COIN_CHIRP, 0);
                 self.set_state(State::DeepSleep);
             }
-
-            // TODO:
-            // do stuff if the battery voltage is below some threshold
         }
         if self.timers.usb_adc_timer.need_service() {
             self.timers.usb_adc_timer.service();
@@ -442,6 +446,11 @@ impl App {
             // #[cfg(feature = "enable_print")]
             // println!("led1 service");
         }
+        if self.timers.shutdown_timer.need_service() {
+            self.timers.shutdown_timer.service();
+            self.timers.shutdown_timer.reset();
+            self.set_state(State::DeepSleep);
+        }
         // if self.timers.led2_timer.need_service() {
         //     let out = match self.settings.brightness {
         //         Level::Off => 0,
@@ -536,11 +545,15 @@ impl App {
         self.settings.volume.next();
         #[cfg(feature = "enable_print")]
         println!("new volume: {:?}", self.settings.volume);
+        self.timers.shutdown_timer.reset();
+        self.timers.shutdown_timer.enable(true);
     }
     pub fn brightness_button(&mut self) {
         self.settings.brightness.next();
         #[cfg(feature = "enable_print")]
         println!("new brightness: {:?}", self.settings.brightness);
+        self.timers.shutdown_timer.reset();
+        self.timers.shutdown_timer.enable(true);
     }
     pub fn main_button_press(&mut self) {
         // TODO
@@ -548,8 +561,10 @@ impl App {
         println!("main button press");
         self.timers.sp_timer.reset();
         self.timers.lp_timer.reset();
+        self.timers.shutdown_timer.reset();
         self.timers.sp_timer.enable(true);
         self.timers.lp_timer.enable(true);
+        self.timers.shutdown_timer.enable(true);
         self.main_button_click();
     }
     pub fn main_button_release(&mut self) {
@@ -581,6 +596,8 @@ impl App {
         self.services
             .sequencer
             .play_sequence(&crate::sequences::COIN_CHIRP, 0);
+        self.timers.shutdown_timer.reset();
+        self.timers.shutdown_timer.enable(true);
     }
 }
 
diff --git a/ch32v-insert-coin/src/main.rs b/ch32v-insert-coin/src/main.rs
index 5d75d4f..b46f114 100644
--- a/ch32v-insert-coin/src/main.rs
+++ b/ch32v-insert-coin/src/main.rs
@@ -297,6 +297,7 @@ fn app_main(mut p: hal::Peripherals) -> ! {
         usb_adc_timer_ms: 10000,
         led0_timer_ms: 100,
         led1_timer_ms: 100,
+        shutdown_timer_ms: 4 * 60 * 60 * 1000,
         // led2_timer_ms: 100,
     };