diff --git a/src/timer.rs b/src/timer.rs
new file mode 100644
index 0000000..fb291d3
--- /dev/null
+++ b/src/timer.rs
@@ -0,0 +1,56 @@
+#![no_std]
+#![no_main]
+
+use core::cell::RefCell;
+use avr_device::interrupt;
+use panic_halt as _;
+
+type Console = arduino_hal::hal::usart::Usart0<arduino_hal::DefaultClock>;
+static CONSOLE: interrupt::Mutex<RefCell<Option<Console>>> = interrupt::Mutex::new(RefCell::new(None));
+
+macro_rules! println {
+    ($($t:tt)*) => {
+        interrupt::free(
+            |cs|
+                {
+                    if let Some(console) = CONSOLE.borrow(cs).borrow_mut().as_mut()
+                        {
+                            let _ = ufmt::uwriteln!(console, $($t)*);
+                        }
+                }
+        )
+        
+    };
+}
+
+fn put_console(console:Console)
+    {
+        interrupt::free(
+            |cs|
+                {
+                    *CONSOLE.borrow(cs).borrow_mut() = Some(console);
+                }
+        )
+    }
+#[arduino_hal::entry]
+fn main() -> ! {
+    let dp = arduino_hal::Peripherals::take().unwrap();
+    let pins = arduino_hal::pins!(dp);
+    let serial = arduino_hal::default_serial!(dp, pins, 57600);
+    put_console(serial);
+    println!("Hello World");
+    
+
+	let mut pin2 = pins.d2.into_output();
+    let mut pin13 = pins.d13.into_output();
+    loop {
+        for i in 0..60
+            {
+                println!("{}", i);
+                pin2.toggle();
+                arduino_hal::delay_ms(1000);
+                pin13.toggle();
+            }
+        println!("Minute");
+    }
+}