diff --git a/bluepill-rs/src/main.rs b/bluepill-rs/src/main.rs
index 6bc79c0..0b67776 100644
--- a/bluepill-rs/src/main.rs
+++ b/bluepill-rs/src/main.rs
@@ -31,7 +31,8 @@ mod app {
     #[local]
     struct Local {
         dmx: DMX<DMX_LEN>,
-        led: gpio::gpioc::PC13<gpio::Output>,
+        led: gpio::gpioc::PC13<gpio::Output<gpio::PushPull>>,
+        int_led: gpio::gpiob::PB0<gpio::Output<gpio::OpenDrain>>,
     }
 
     #[init]
@@ -56,11 +57,16 @@ mod app {
 
         // Acquire the peripherals
         let mut gpioa = cx.device.GPIOA.split();
+        let mut gpiob = cx.device.GPIOB.split();
         let mut gpioc = cx.device.GPIOC.split();
 
         let mut afio = cx.device.AFIO.constrain();
         let dma1 = cx.device.DMA1.split();
 
+        cx.device.EXTI.imr.write(|w| w.mr1().set_bit());
+
+        let _ = gpiob.pb10.into_pull_up_input(&mut gpiob.crh);
+
         // Serial config
         let serial = serial::Serial::new(
             cx.device.USART1,
@@ -91,6 +97,10 @@ mod app {
                 led: gpioc
                     .pc13
                     .into_push_pull_output_with_state(&mut gpioc.crh, gpio::PinState::High),
+
+                int_led: gpiob
+                    .pb0
+                    .into_open_drain_output_with_state(&mut gpiob.crl, gpio::PinState::Low),
             },
             init::Monotonics(mono),
         )
@@ -113,4 +123,10 @@ mod app {
         // cx.local.dmx.wait();
         foo::spawn().unwrap();
     }
+
+    #[task(binds=EXTI0, local = [int_led], shared = [delay_us])]
+    fn bar(mut cx: bar::Context) {
+        cx.local.int_led.toggle();
+        cx.shared.delay_us.lock(|d| d.delay(1.secs()));
+    }
 }