diff --git a/halloween-leds/src/main.rs b/halloween-leds/src/main.rs
index 5dea472..5cd0be2 100644
--- a/halloween-leds/src/main.rs
+++ b/halloween-leds/src/main.rs
@@ -1,8 +1,8 @@
 #![no_main]
 #![no_std]
 
-use embedded_hal::{delay::DelayNs, digital::OutputPin};
 use embedded_hal::spi::SpiBus;
+use embedded_hal::{delay::DelayNs, digital::OutputPin};
 use panic_halt as _;
 use rp_pico::hal::gpio::bank0::Gpio0;
 use rp_pico::{
@@ -21,6 +21,8 @@ use rp_pico::{
     pac, Pins,
 };
 
+const FPS: u32 = 60;
+const MS_PER_FRAME: u32 = 1000 / FPS;
 const XOSC_CRYSTAL_FREQ: u32 = 12_000_000; // MHz, https://forums.raspberrypi.com/viewtopic.php?t=356764
 
 #[entry]
@@ -46,8 +48,6 @@ unsafe fn main() -> ! {
     .ok()
     .unwrap();
 
-    // let mut power_light: Pin<Gpio0, FunctionSio<SioOutput>, PullDown> = pins.gpio0.into_function();
-    // power_light.set_high();
     let mut timer = Timer::new(peripherals.TIMER, &mut peripherals.RESETS, &clocks);
 
     let spi_clk = pins.gpio10.into_function();
@@ -60,44 +60,32 @@ unsafe fn main() -> ! {
         embedded_hal::spi::MODE_1,
     );
 
-    let mut lights: [u8; 126] = [0; 126];
-    lights[124] = 0xff;
-    lights[125] = 0xff;
-    for i in 0..30 {
-        lights[(i + 1) * 4 + 0] = 0xe0 + 1;
-        lights[(i + 1) * 4 + 1] = 255;
-    }
+    // byte count: 4 for the start frame
+    //             1 * 4 for three lights with 4 bytes per light
+    //             4 for the end frame
+    //             = 20 bytes
+    let mut lights: [u8; 12] = [0; 12];
+    lights[8] = 0xff;
+    lights[9] = 0xff;
+    lights[10] = 0xff;
+    lights[11] = 0xff;
+
+    lights[4] = 0xe0 + 1;
 
     let mut brightness = 1;
     let mut step = 1;
     loop {
-        if brightness == 255 && step == 1 {
+        if brightness == 64 && step == 1 {
             step = -1;
         } else if brightness == 1 && step == -1 {
             step = 1;
         };
-        for i in 0..30 {
-            lights[(i + 1) * 4 + 3] = brightness as u8;
-        }
+        lights[5] = brightness as u8;
+        lights[6] = 255;
+        // lights[7] = brightness as u8;
         brightness = brightness + step;
-        
+
         spi.write(lights.as_slice());
-        timer.delay_ms(10);
+        timer.delay_ms(MS_PER_FRAME);
     }
-
-    /*
-    let pins = (pins.gpio0.into_function(), pins.gpio1.into_function());
-
-    let uart = UartPeripheral::new(peripherals.UART0, pins, &mut peripherals.RESETS)
-        .enable(
-            UartConfig::new(9600_u32.Hz(), DataBits::Eight, None, StopBits::One),
-            clocks.peripheral_clock.freq(),
-        )
-        .unwrap();
-
-    loop {
-        uart.write_full_blocking(b"Hello World!\r\n");
-        timer.delay_ms(1000);
-    }
-    */
 }