diff --git a/ch32v-insert-coin/src/debounced_gpio.rs b/ch32v-insert-coin/src/debounced_gpio.rs
index baec633..784c3fd 100644
--- a/ch32v-insert-coin/src/debounced_gpio.rs
+++ b/ch32v-insert-coin/src/debounced_gpio.rs
@@ -17,7 +17,7 @@ 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),
+            input: Input::new(pin, Pull::None),
             value: false,
             ready: false,
             active: false,
diff --git a/ch32v-insert-coin/src/main.rs b/ch32v-insert-coin/src/main.rs
index 3414329..c4e404f 100644
--- a/ch32v-insert-coin/src/main.rs
+++ b/ch32v-insert-coin/src/main.rs
@@ -55,6 +55,12 @@ impl Usb {
     pub fn powered(&self) -> bool {
         self.usb_pin.is_high()
     }
+    // pub fn enable(&mut self) {
+    //     self.usb_pin.set_as_input(Pull::Up);
+    // }
+    // pub fn disable(&mut self) {
+    //     self.usb_pin.set_as_input(Pull::None);
+    // }
 }
 
 pub struct Amplifier {