diff --git a/src/main.rs b/src/main.rs
index 3fd840d..ea150a4 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,6 +2,7 @@
 #![no_main]
 
 use arduino_hal::prelude::*;
+use embedded_hal::digital::OutputPin;
 
 // NOTE: 115200 @ 16MHz is 3.5% off, try 9600 or 1M if it causes issues (https://wormfood.net/avrbaudcalc.php)
 const SERIAL_BAUD: u32 = 115200;
@@ -36,6 +37,12 @@ fn panic(info: &core::panic::PanicInfo) -> ! {
     }
 }
 
+enum SegmentState {
+    Num(u8),
+    Minus,
+    Dot,
+}
+
 #[arduino_hal::entry]
 fn main() -> ! {
     let dp = arduino_hal::Peripherals::take().unwrap();
@@ -46,9 +53,84 @@ fn main() -> ! {
 
     ufmt::uwriteln!(&mut serial, "Hello from Arduino!").unwrap_infallible();
 
+    // let mut kd_KN = pins..into_input();
+    // let mut kd_KO = *pins.a.into_output();
+    let mut kd_d1_1c = pins.d2.into_output();
+    let mut kd_d2_5div = pins.d3.into_output();
+    let mut kd_d3_6mul = pins.d4.into_output();
+    let mut kd_d4_7up = pins.a3.into_output();
+    let mut kd_d5_8e = pins.a2.into_output();
+    let mut kd_d6_90 = pins.d7.into_output();
+    let mut kd_d7_2down = pins.a1.into_output();
+    let mut kd_d8_3plus = pins.d11.into_output();
+    let mut kd_d9_4min = pins.d12.into_output();
+
+    let mut kd_seg_a = pins.d5.into_output();
+    kd_seg_a.set_high();
+    let mut kd_seg_b = pins.d8.into_output();
+    kd_seg_b.set_high();
+    let mut kd_seg_c = pins.d10.into_output();
+    kd_seg_c.set_high();
+    let mut kd_seg_d = pins.a5.into_output();
+    kd_seg_d.set_high();
+    let mut kd_seg_e = pins.d9.into_output();
+    kd_seg_e.set_high();
+    let mut kd_seg_f = pins.d6.into_output();
+    kd_seg_f.set_high();
+    let mut kd_seg_g = pins.a0.into_output();
+    kd_seg_g.set_high();
+    let mut kd_seg_dp = pins.a4.into_output();
+    kd_seg_dp.set_high();
+
     loop {
-        led.toggle();
-        arduino_hal::delay_ms(1000);
-        ufmt::uwrite!(&mut serial, ".").unwrap_infallible();
+        for d in 1u8..=9 {
+            match d {
+                1 => {
+                    kd_d9_4min.set_low();
+                    kd_d1_1c.set_high();
+                }
+                2 => {
+                    kd_d1_1c.set_low();
+                    kd_d2_5div.set_high();
+                }
+                3 => {
+                    kd_d2_5div.set_low();
+                    kd_d3_6mul.set_high();
+                }
+                4 => {
+                    kd_d3_6mul.set_low();
+                    kd_d4_7up.set_high();
+                }
+                5 => {
+                    kd_d4_7up.set_low();
+                    kd_d5_8e.set_high();
+                }
+                6 => {
+                    kd_d5_8e.set_low();
+                    kd_d6_90.set_high();
+                }
+                7 => {
+                    kd_d6_90.set_low();
+                    kd_d7_2down.set_high();
+                }
+                8 => {
+                    kd_d7_2down.set_low();
+                    kd_d8_3plus.set_high();
+                }
+                9 => {
+                    kd_d8_3plus.set_low();
+                    kd_d9_4min.set_high();
+                }
+                _ => unreachable!(),
+            };
+            kd_seg_g.set_low();
+            arduino_hal::delay_ms(1);
+        }
     }
+
+    // loop {
+    //     led.toggle();
+    //     arduino_hal::delay_ms(1000);
+    //     ufmt::uwrite!(&mut serial, ".").unwrap_infallible();
+    // }
 }