diff --git a/spectacle.yml b/spectacle.yml
index 8e955c9..098af97 100644
--- a/spectacle.yml
+++ b/spectacle.yml
@@ -1,8 +1,25 @@
   - name : toto
     mac_addresses :
       - C9:81:9C:BA:53:BC
-      - D8:D3:AF:87:70:FA
     sequence:
+      - pattern:
+          type: Blink
+          fade:
+            current_iteration: 10
+            nbr_iterations: 20
+            begin_color:
+              red: 0
+              green: 0
+              blue: 0
+            end_color:
+              red: 255
+              green: 0
+              blue: 255
+          current_iteration: 0
+          max_iteration: 10
+        period:
+          secs: 0
+          nanos: 50000000
       - pattern:
           type: Fade
           current_iteration: 0
@@ -42,25 +59,28 @@
           stability: 40
         period:
           secs: 0
-          nanos: 100000000
+          nanos: 800000000
 
   - name: titi
     sequence:
       - pattern:
-          type: Fade
+          type: Blink
+          fade :
+            current_iteration: 0
+            nbr_iterations: 20
+            begin_color:
+                red: 0
+                green: 0
+                blue: 0
+            end_color:
+                red: 0
+                green: 255
+                blue: 255
           current_iteration: 0
-          nbr_iterations: 20
-          begin_color:
-            red: 255
-            green: 0
-            blue: 0
-          end_color:
-            red: 0
-            green: 0
-            blue: 255
+          max_iteration : 10
         period:
           secs: 0
-          nanos: 200000000
+          nanos: 100000000
       - pattern:
           type: Rainbow
           current_iteration: 0
diff --git a/src/main.rs b/src/main.rs
index d8758d9..984f4b4 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -11,12 +11,15 @@ use crate::audio::play_sound;
 use crate::config::{load_from_file, Config};
 use crate::runner::Spectacle;
 use bluer::gatt::remote::Characteristic;
+use bluer::{Device, Error};
 use clap::Parser;
 use patterns::Strip;
 use std::path::Path;
 use std::sync::{Arc, Mutex};
+use std::time::Duration;
 use tokio::sync::mpsc;
-use tokio::sync::watch::Receiver;
+use tokio::sync::watch;
+use tokio::sync::Notify;
 
 const SERVICE_UUID: bluer::Uuid = bluer::Uuid::from_u128(0xadaf0900c33242a893bd25e905756cb8);
 const PIXEL_DATA_UUID: bluer::Uuid = bluer::Uuid::from_u128(0xadaf0903c33242a893bd25e905756cb8);
@@ -36,7 +39,7 @@ async fn main() -> bluer::Result<()> {
     let musique = tokio::task::spawn_blocking(move || play_sound(Path::new(&musique_file)));
 
     let adapter = bluetooth::create_session().await?;
-    let (tx_scan, mut rx_scan) = mpsc::channel(3);
+    let (tx_scan, rx_scan) = mpsc::channel(3);
 
     tokio::spawn(bluetooth::bluetooth_scan(
         tx_scan,
@@ -44,34 +47,9 @@ async fn main() -> bluer::Result<()> {
         SERVICE_UUID,
     ));
 
-    let spectacle_channels = spectacle.clone();
-    tokio::spawn(async move {
-        while let Some(device) = rx_scan.recv().await {
-            bluetooth::connect(&device, 3).await?;
-            let char = bluetooth::get_char(&device, SERVICE_UUID, PIXEL_DATA_UUID).await?;
-            if let Some(char) = char {
-                let rx: Option<Receiver<Strip<STRIP_SIZE>>>;
-                {
-                    let spectacle_channels = spectacle_channels.lock().unwrap();
-                    rx = spectacle_channels.get_channel(&device.address());
-                }
-                if let Some(mut rx) = rx {
-                    tokio::spawn(async move {
-                        println!("device connected : {}", &device.address());
-                        while rx.changed().await.is_ok() {
-                            let strip = *rx.borrow();
-                            if write_strip(&strip, &char).await.is_err() {
-                                break;
-                            };
-                        }
-                        println!("device {} disconnected", &device.address());
-                        // drop(rx_device);
-                    });
-                }
-            }
-        }
-        bluer::Result::Ok(())
-    });
+    tokio::spawn(connect_device(spectacle.clone(), rx_scan));
+
+    tokio::time::sleep(Duration::from_secs(5)).await;
 
     println!("starting");
     let futures;
@@ -90,6 +68,37 @@ async fn main() -> bluer::Result<()> {
     Ok(())
 }
 
+async fn connect_device(
+    spectacle: Arc<Mutex<Spectacle<STRIP_SIZE>>>,
+    mut rx_scan: mpsc::Receiver<Device>,
+) -> Result<(), Error> {
+    while let Some(device) = rx_scan.recv().await {
+        bluetooth::connect(&device, 3).await?;
+        let char = bluetooth::get_char(&device, SERVICE_UUID, PIXEL_DATA_UUID).await?;
+        if let Some(char) = char {
+            let rx: Option<watch::Receiver<Strip<STRIP_SIZE>>>;
+            {
+                let spectacle = spectacle.lock().unwrap();
+                rx = spectacle.get_channel(&device.address());
+            }
+            if let Some(mut rx) = rx {
+                tokio::spawn(async move {
+                    println!("device connected : {}", &device.address());
+                    while rx.changed().await.is_ok() {
+                        let strip = *rx.borrow();
+                        if write_strip(&strip, &char).await.is_err() {
+                            break;
+                        };
+                    }
+                    println!("device {} disconnected", &device.address());
+                    // drop(rx_device);
+                });
+            }
+        }
+    }
+    bluer::Result::Ok(())
+}
+
 pub async fn write_strip<const N: usize>(
     data: &Strip<N>,
     char: &Characteristic,
diff --git a/src/patterns.rs b/src/patterns.rs
index 41eeaa7..13814d7 100644
--- a/src/patterns.rs
+++ b/src/patterns.rs
@@ -11,7 +11,8 @@ pub(crate) enum Patterns<const N: usize> {
     ColorWipe(ColorWipe<N>),
     Scanner(Scanner<N>),
     FillRandom(FillRandom<N>),
-    FillUnstable(FillUnstable<N>)
+    FillUnstable(FillUnstable<N>),
+    Blink(Blink<N>),
 }
 
 impl<const N: usize> Iterator for Patterns<N> {
@@ -25,6 +26,7 @@ impl<const N: usize> Iterator for Patterns<N> {
             Patterns::Scanner(p) => p.next(),
             Patterns::FillRandom(p) => p.next(),
             Patterns::FillUnstable(p) => p.next(),
+            Patterns::Blink(p) => p.next(),
         }
     }
 }
@@ -101,6 +103,10 @@ impl<const N: usize> Strip<N> {
         data
     }
 
+    pub fn new(color: PixelColor) -> Strip<N> {
+        Strip { 0: [color; N] }
+    }
+
     pub fn fill(&mut self, color: PixelColor) {
         self.0.fill(color);
     }
@@ -118,6 +124,7 @@ impl<const N: usize> Strip<N> {
 ///
 #[derive(Serialize, Deserialize, Debug, Eq, Hash, PartialEq, Copy, Clone)]
 pub struct Rainbow<const N: usize> {
+    #[serde(default)]
     pub(crate) current_iteration: usize,
     pub(crate) max_iteration: Option<usize>,
     pub(crate) step: Option<usize>,
@@ -189,6 +196,7 @@ fn wheel(index: u8) -> PixelColor {
 ///
 #[derive(Serialize, Deserialize, Debug, Eq, Hash, PartialEq, Copy, Clone)]
 pub struct ColorWipe<const N: usize> {
+    #[serde(default)]
     pub(crate) current_iteration: usize,
     pub(crate) max_iteration: Option<usize>,
     pub(crate) color: PixelColor,
@@ -222,6 +230,7 @@ impl<const N: usize> Iterator for ColorWipe<N> {
 /// fade from one color to an other
 #[derive(Serialize, Deserialize, Debug, Eq, Hash, PartialEq, Copy, Clone)]
 pub struct Fade<const N: usize> {
+    #[serde(default)]
     pub(crate) current_iteration: usize,
     pub(crate) nbr_iterations: usize,
     pub(crate) begin_color: PixelColor,
@@ -278,6 +287,7 @@ impl<const N: usize> Iterator for Fade<N> {
 /// background_color work only for color not set by scanner pattern
 #[derive(Serialize, Deserialize, Debug, Eq, Hash, PartialEq, Copy, Clone)]
 pub struct Scanner<const N: usize> {
+    #[serde(default)]
     pub(crate) current_iteration: usize,
     pub(crate) color: PixelColor,
     pub(crate) background_color: Option<PixelColor>,
@@ -403,3 +413,50 @@ impl<const N: usize> Iterator for FillUnstable<N> {
         Some(strip)
     }
 }
+
+#[derive(Serialize, Deserialize, Debug, Eq, Hash, PartialEq, Copy, Clone)]
+enum Direction {
+    there,
+    back,
+}
+
+impl Default for Direction {
+    fn default() -> Self {
+        Direction::there
+    }
+}
+
+/// # Blink
+///
+/// fade from one color to an other then go back several times
+#[derive(Serialize, Deserialize, Debug, Eq, Hash, PartialEq, Copy, Clone)]
+pub struct Blink<const N: usize> {
+    #[serde(default)]
+    pub(crate) current_iteration: usize,
+    pub(crate) max_iteration: Option<usize>,
+    fade: Fade<N>,
+    #[serde(default)]
+    direction: Direction,
+}
+
+impl<const N: usize> Iterator for Blink<N> {
+    type Item = Strip<N>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let value = self.fade.next();
+        match value {
+            None => {
+                if let Some(iter_max) = self.max_iteration {
+                    if self.current_iteration >= iter_max {
+                        return None;
+                    }
+                    self.current_iteration += 1;
+                }
+                self.fade.current_iteration = 0;
+                std::mem::swap(&mut self.fade.begin_color, &mut self.fade.end_color);
+                self.fade.next()
+            }
+            Some(value) => Some(value),
+        }
+    }
+}
diff --git a/src/runner.rs b/src/runner.rs
index 57fd036..2b6fcfd 100644
--- a/src/runner.rs
+++ b/src/runner.rs
@@ -1,5 +1,5 @@
 use crate::config::Config;
-use crate::patterns::Patterns;
+use crate::patterns::{Patterns, PixelColor};
 use crate::Strip;
 use bluer::Address;
 use serde_derive::{Deserialize, Serialize};
@@ -45,19 +45,36 @@ impl<const N: usize> Spectacle<N> {
         if let Some((_, rx)) = self.runners.get(&runner as &DeviceSequence<N>) {
             self.channels.insert(mac_address, rx.clone());
         } else {
-            let (tx, rx) = tokio::sync::watch::channel(Strip::<N>::default());
+            let (tx, rx) = tokio::sync::watch::channel(Strip::<N>::new(PixelColor {
+                red: 0,
+                green: 255,
+                blue: 0,
+            }));
             self.runners.insert(runner.clone(), (tx, rx.clone()));
             self.channels.insert(mac_address, rx);
         }
     }
 
     pub fn add_default(&mut self, runner: DeviceSequence<N>) {
-        let (tx, rx) = tokio::sync::watch::channel(Strip::<N>::default());
+        let (tx, rx) = tokio::sync::watch::channel(Strip::<N>::new(PixelColor {
+            red: 0,
+            green: 0,
+            blue: 255,
+        }));
         // self.tasks.push(runner.runner_loop(tx));
         self.default_runner = Some((runner, tx));
         self.default_receiver = Some(rx);
     }
 
+    pub fn nbr_tasks(&self) -> usize {
+        let mut nbr = 0;
+        if self.default_receiver.is_some() {
+            nbr += 1;
+        }
+        nbr += self.runners.len();
+        nbr
+    }
+
     pub fn get_channel(&self, mac_address: &Address) -> Option<Receiver<Strip<N>>> {
         let channel = self.channels.get(mac_address);
         match channel {