diff --git a/ch32v-insert-coin/src/debounced_gpio.rs b/ch32v-insert-coin/src/debounced_gpio.rs
new file mode 100644
index 0000000..baec633
--- /dev/null
+++ b/ch32v-insert-coin/src/debounced_gpio.rs
@@ -0,0 +1,66 @@
+use crate::insert_coin::{TickService, TickServiceData, TickTimerService};
+use ch32_hal::gpio::{AnyPin, Input, Pull};
+
+pub struct DebouncedGPIO<'a> {
+    input: Input<'a>,
+    // value of the GPIO
+    value: bool,
+    // GPIO is ready (debounced)
+    ready: bool,
+    // debouncer is active
+    active: bool,
+    // debounce timer
+    timer: TickTimerService,
+}
+
+impl<'a> DebouncedGPIO<'a> {
+    pub fn new(pin: AnyPin, system_tick_rate_hz: usize, debounce_time_ms: usize) -> Self {
+        // coin debounce timer (100ms)
+        Self {
+            input: Input::new(pin, Pull::Up),
+            value: false,
+            ready: false,
+            active: false,
+            timer: TickTimerService::new(
+                TickServiceData::new(system_tick_rate_hz * debounce_time_ms / 1000),
+                false,
+            ),
+        }
+    }
+
+    pub fn ready(&self) -> bool {
+        self.ready
+    }
+
+    pub fn active(&self) -> bool {
+        self.active
+    }
+
+    pub fn value(&self) -> bool {
+        self.value
+    }
+
+    pub fn begin(&mut self) {
+        self.reset();
+        self.timer.enable(true);
+        self.active = true;
+    }
+
+    pub fn reset(&mut self) {
+        self.timer.reset();
+        self.ready = false;
+        self.active = false;
+    }
+
+    pub fn service(&mut self) {
+        self.timer.tick();
+        if self.timer.need_service() {
+            self.timer.reset();
+            self.value = self.input.is_high();
+            self.ready = true;
+        }
+    }
+    pub fn is_high_immediate(&self) -> bool {
+        self.input.is_high()
+    }
+}
diff --git a/ch32v-insert-coin/src/main.rs b/ch32v-insert-coin/src/main.rs
index 34ece4e..7fdfb35 100644
--- a/ch32v-insert-coin/src/main.rs
+++ b/ch32v-insert-coin/src/main.rs
@@ -9,6 +9,9 @@ mod insert_coin;
 // system stuff
 mod system;
 
+mod debounced_gpio;
+use debounced_gpio::DebouncedGPIO;
+
 // synthesizer :3
 mod synthesizer;
 use synthesizer::AppSynthesizers;
@@ -35,70 +38,6 @@ use qingke::riscv;
 
 static LED0_SEQ: [u8; 8] = [0u8, 25u8, 50u8, 75u8, 100u8, 75u8, 50u8, 25u8];
 
-struct DebouncedGPIO<'a> {
-    input: Input<'a>,
-    // value of the GPIO
-    value: bool,
-    // GPIO is ready (debounced)
-    ready: bool,
-    // debouncer is active
-    active: bool,
-    // debounce timer
-    timer: TickTimerService,
-}
-
-impl<'a> DebouncedGPIO<'a> {
-    pub fn new(pin: AnyPin, system_tick_rate_hz: usize, debounce_time_ms: usize) -> Self {
-        // coin debounce timer (100ms)
-        Self {
-            input: Input::new(pin, Pull::Up),
-            value: false,
-            ready: false,
-            active: false,
-            timer: TickTimerService::new(
-                TickServiceData::new(system_tick_rate_hz * debounce_time_ms / 1000),
-                false,
-            ),
-        }
-    }
-
-    pub fn ready(&self) -> bool {
-        self.ready
-    }
-
-    pub fn active(&self) -> bool {
-        self.active
-    }
-
-    pub fn value(&self) -> bool {
-        self.value
-    }
-
-    pub fn begin(&mut self) {
-        self.reset();
-        self.timer.enable(true);
-        self.active = true;
-    }
-
-    pub fn reset(&mut self) {
-        self.timer.reset();
-        self.ready = false;
-        self.active = false;
-    }
-
-    pub fn service(&mut self) {
-        self.timer.tick();
-        if self.timer.need_service() {
-            self.timer.reset();
-            self.value = self.input.is_high();
-            self.ready = true;
-        }
-    }
-    pub fn is_high_immediate(&self) -> bool {
-        self.input.is_high()
-    }
-}
-
 #[derive(Debug)]
 struct Flag {
     value: bool,
@@ -308,22 +247,6 @@ fn app_main(mut p: hal::Peripherals) -> ! {
     let mut light_ctrl_btn_input =
         DebouncedGPIO::new(light_ctrl_btn_pin.degrade(), core_config.tick_rate_hz, 100);
 
-    // let mut interfaces = InsertCoin::new(core_config, pwm_core);
-    // interfaces.set_active(true);
-
-    let mut led0_index = 0;
-    let led0_dcs = [0u8, 25u8, 50u8, 75u8, 100u8, 75u8, 50u8, 25u8];
-
-    let mut led1_index = 0;
-    let led1_dcs = [0u8, 25u8, 50u8, 75u8, 100u8];
-
-    // // battery read timer
-    // let adc1_ticks = 5 * interfaces.config.tick_rate_hz;
-    // let adc1_timer_data = TickServiceData::new(adc1_ticks);
-    // let mut adc1_timer = TickTimerService::new(adc1_timer_data, false);
-    // adc1_timer.reset();
-    // adc1_timer.enable(true);
-
     let timer_config = TimerConfig {
         sp_timer_ms: 2000,
         lp_timer_ms: 5000,