diff --git a/bike-lights/bike/src/main.rs b/bike-lights/bike/src/main.rs
index 4e45da7..b309376 100644
--- a/bike-lights/bike/src/main.rs
+++ b/bike-lights/bike/src/main.rs
@@ -3,21 +3,21 @@
 
 extern crate alloc;
 
+use alloc::boxed::Box;
 use az::*;
 use core::cell::RefCell;
 use cortex_m::delay::Delay;
 use embedded_alloc::Heap;
-use embedded_hal::{blocking::spi::Write, digital::v2::OutputPin};
+use embedded_hal::{blocking::spi::Write, digital::v2::InputPin};
 use fixed::types::I16F16;
 use fugit::RateExtU32;
-use lights_core::{
-    BodyPattern, DashboardPattern, Event, TRANS_PRIDE_BODY, TRANS_PRIDE_DASHBOARD, UI,
-};
+use lights_core::{App, BodyPattern, DashboardPattern, Event, Instant, State, FPS, UI};
 use panic_halt as _;
 use rp_pico::{
     entry,
     hal::{
         clocks::init_clocks_and_plls,
+        gpio::{FunctionSio, Pin, PinId, PullDown, SioInput},
         pac::{CorePeripherals, Peripherals},
         spi::{Enabled, Spi, SpiDevice, ValidSpiPinout},
         watchdog::Watchdog,
@@ -32,25 +32,74 @@ static HEAP: Heap = Heap::empty();
 const LIGHT_SCALE: I16F16 = I16F16::lit("256.0");
 const GLOBAL_BRIGHTESS: u8 = 1;
 
-struct BikeUI<D: SpiDevice, P: ValidSpiPinout<D>> {
+struct BikeUI<
+    D: SpiDevice,
+    P: ValidSpiPinout<D>,
+    LeftId: PinId,
+    RightId: PinId,
+    PreviousId: PinId,
+    NextId: PinId,
+> {
     spi: RefCell<Spi<Enabled, D, P, 8>>,
+    left_blinker_button: Pin<LeftId, FunctionSio<SioInput>, PullDown>,
+    right_blinker_button: Pin<RightId, FunctionSio<SioInput>, PullDown>,
+    previous_animation_button: Pin<PreviousId, FunctionSio<SioInput>, PullDown>,
+    next_animation_button: Pin<NextId, FunctionSio<SioInput>, PullDown>,
 }
 
-impl<D: SpiDevice, P: ValidSpiPinout<D>> BikeUI<D, P> {
-    fn new(spi: Spi<Enabled, D, P, 8>) -> Self {
+impl<
+        D: SpiDevice,
+        P: ValidSpiPinout<D>,
+        LeftId: PinId,
+        RightId: PinId,
+        PreviousId: PinId,
+        NextId: PinId,
+    > BikeUI<D, P, LeftId, RightId, PreviousId, NextId>
+{
+    fn new(
+        spi: Spi<Enabled, D, P, 8>,
+        left_blinker_button: Pin<LeftId, FunctionSio<SioInput>, PullDown>,
+        right_blinker_button: Pin<RightId, FunctionSio<SioInput>, PullDown>,
+        previous_animation_button: Pin<PreviousId, FunctionSio<SioInput>, PullDown>,
+        next_animation_button: Pin<NextId, FunctionSio<SioInput>, PullDown>,
+    ) -> Self {
         Self {
             spi: RefCell::new(spi),
+            left_blinker_button,
+            right_blinker_button,
+            previous_animation_button,
+            next_animation_button,
         }
     }
 }
 
-impl<D: SpiDevice, P: ValidSpiPinout<D>> UI for BikeUI<D, P> {
+impl<
+        D: SpiDevice,
+        P: ValidSpiPinout<D>,
+        LeftId: PinId,
+        RightId: PinId,
+        PreviousId: PinId,
+        NextId: PinId,
+    > UI for BikeUI<D, P, LeftId, RightId, PreviousId, NextId>
+{
     fn check_event(&self) -> Option<Event> {
-        None
+        if self.left_blinker_button.is_high().unwrap_or(false) {
+            Some(Event::LeftBlinker)
+        } else if self.right_blinker_button.is_high().unwrap_or(false) {
+            Some(Event::RightBlinker)
+        } else if self.previous_animation_button.is_high().unwrap_or(false) {
+            Some(Event::PreviousPattern)
+        } else if self.next_animation_button.is_high().unwrap_or(false) {
+            Some(Event::NextPattern)
+        } else {
+            None
+        }
     }
 
     fn update_lights(&self, dashboard_lights: DashboardPattern, body_lights: BodyPattern) {
         let mut lights: [u8; 20] = [0; 20];
+        // Check https://www.pololu.com/product/3089 for the end frame calculations. It is not what
+        // I thought.
         lights[16] = 0xff;
         lights[17] = 0xff;
         lights[18] = 0xff;
@@ -110,25 +159,29 @@ fn main() -> ! {
         embedded_hal::spi::MODE_1,
     );
 
-    let ui = BikeUI::new(spi);
+    let left_blinker_button = pins.gpio18.into_pull_down_input();
+    let right_blinker_button = pins.gpio19.into_function();
+    let previous_animation_button = pins.gpio20.into_function();
+    let next_animation_button = pins.gpio21.into_pull_down_input();
 
-    // let app = App::new(Box::new(ui));
-    // app.tick(TRANS_PRIDE_DASHBOARD, TRANS_PRIDE_BODY);
-    ui.update_lights(TRANS_PRIDE_DASHBOARD, TRANS_PRIDE_BODY);
+    let ui = BikeUI::new(
+        spi,
+        left_blinker_button,
+        right_blinker_button,
+        previous_animation_button,
+        next_animation_button,
+    );
 
-    /*
-    spi.write(&[
-        0, 0, 0, 0, 0xe1, 0x80, 0x00, 0x00, 0xe1, 0x00, 0x80, 0x00, 0xe1, 0x00, 0x00, 0x80, 0xff,
-        0xff, 0xff, 0xff,
-    ]);
-    */
+    let mut app = App::new(Box::new(ui));
 
     let mut led_pin = pins.led.into_push_pull_output();
 
+    let mut time = Instant::default();
+    let delay_ms = 1000 / (FPS as u32);
     loop {
-        led_pin.set_high().unwrap();
-        delay.delay_ms(500);
-        led_pin.set_low().unwrap();
-        delay.delay_ms(500);
+        app.tick(time);
+
+        delay.delay_ms(delay_ms);
+        time = time + Instant(delay_ms.into());
     }
 }
diff --git a/bike-lights/core/src/lib.rs b/bike-lights/core/src/lib.rs
index 361d39b..28e803c 100644
--- a/bike-lights/core/src/lib.rs
+++ b/bike-lights/core/src/lib.rs
@@ -3,7 +3,13 @@
 extern crate alloc;
 use alloc::boxed::Box;
 use az::*;
-use core::{clone::Clone, cmp::PartialEq, ops::Sub, option::Option};
+use core::{
+    clone::Clone,
+    cmp::PartialEq,
+    default::Default,
+    ops::{Add, Sub},
+    option::Option,
+};
 use fixed::types::{I48F16, I8F8, U128F0, U16F0};
 
 mod patterns;
@@ -30,6 +36,20 @@ fn linear_ease(value: I8F8, frames: U16F0, slope: I8F8) -> I8F8 {
 #[derive(Clone, Copy)]
 pub struct Instant(pub U128F0);
 
+impl Default for Instant {
+    fn default() -> Self {
+        Self(U128F0::from(0 as u8))
+    }
+}
+
+impl Add for Instant {
+    type Output = Self;
+
+    fn add(self, r: Self) -> Self::Output {
+        Self(self.0 + r.0)
+    }
+}
+
 impl Sub for Instant {
     type Output = Self;