diff --git a/rust/arduino/Cargo.toml b/rust/arduino/Cargo.toml
index 756c5e8..816ff40 100644
--- a/rust/arduino/Cargo.toml
+++ b/rust/arduino/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 [dependencies]
 panic-halt = "0.2.0"
-avr-device = "0.5.0"
+avr-device = { version = "0.5.0", features = ["atmega328p"] }
 arduino-hal = { git = "https://github.com/Rahix/avr-hal", features = ["arduino-uno"], rev = "1aacefb335517f85d0de858231e11055d9768cdf" }
 ufmt = "0.2.0"
 
diff --git a/rust/serial_reader/src/main.rs b/rust/serial_reader/src/main.rs
index d76ceca..0a94514 100644
--- a/rust/serial_reader/src/main.rs
+++ b/rust/serial_reader/src/main.rs
@@ -104,7 +104,7 @@ fn main() {
                     timeout: Duration::from_millis(2500),
                 };
 
-                if let Ok(port) = Port::open(usb_id, serialport_settings) {
+                if let Ok(port) = Port::open(usb_id, serialport_settings, 50, 1) {
                     CONNECTED.store(true, SeqCst);
 
                     *PORT.lock().unwrap() = Some(port);
@@ -130,7 +130,15 @@ fn main() {
 
         rx.attach(None, move |message| {
             if !message.is_empty() {
-                buffer.insert(&mut buffer.end_iter(), &format!("{}\n", message));
+                match message.parse::<u32>() {
+                    Ok(n) => {
+                        buffer.insert(&mut buffer.end_iter(), &format!("{:#02x}\n", n));
+                    }
+                    Err(_) => {
+                        buffer.insert(&mut buffer.end_iter(), &format!("{}\n", message));
+                    }
+                }
+
                 serial_info.scroll_to_iter(&mut buffer.end_iter(), 0.0, true, 0.0, 0.0);
             }
 
diff --git a/rust/serial_reader/src/port.rs b/rust/serial_reader/src/port.rs
index 2793b70..68622d8 100644
--- a/rust/serial_reader/src/port.rs
+++ b/rust/serial_reader/src/port.rs
@@ -30,8 +30,13 @@ pub struct Port {
 }
 
 impl Port {
-    pub fn open(usb_device: UsbId, settings: SerialPortSettings) -> Result<Self> {
-        let port_path = Self::loop_usb_devices(usb_device)?;
+    pub fn open(
+        usb_device: UsbId,
+        settings: SerialPortSettings,
+        retries: usize,
+        wait_time: u64,
+    ) -> Result<Self> {
+        let port_path = Self::loop_usb_devices(usb_device, retries, wait_time)?;
 
         println!("found device at path {}", port_path);
 
@@ -68,8 +73,8 @@ impl Port {
         Ok(())
     }
 
-    fn loop_usb_devices(usb_device: UsbId) -> Result<String> {
-        for _ in 0..3 {
+    fn loop_usb_devices(usb_device: UsbId, retries: usize, wait_time: u64) -> Result<String> {
+        for _ in 0..retries {
             if let Some(device) = Self::find_macroboard(&usb_device)? {
                 return Ok(device);
             }
@@ -79,7 +84,7 @@ impl Port {
                 usb_device.vendor_id, usb_device.product_id
             );
 
-            std::thread::sleep(Duration::from_secs(2));
+            std::thread::sleep(Duration::from_secs(wait_time));
         }
 
         Err(anyhow!("no device found"))