diff --git a/spectacle.yml b/spectacle.yml
index f2e3a6f..64d4c99 100644
--- a/spectacle.yml
+++ b/spectacle.yml
@@ -17,17 +17,27 @@
 #              blue: 255
 #          max_iteration: 10
 #        period: 50
+      - pattern:
+          type: Rain
+          color: &blue
+            red: 0
+            green: 0
+            blue: 255
+          background_color: &black
+            red: 0
+            green: 0
+            blue: 0
+          stability: 10
+          lines: 5
+        period: 200
       - pattern:
           type: Fade
-          nbr_iterations: 20
+          steps: 20
           begin_color: &red
             red: 255
             green: 0
             blue: 0
-          end_color: &blue
-            red: 0
-            green: 0
-            blue: 255
+          end_color: *blue
         period: 200
       - pattern:
           type: ColorWipe
@@ -60,6 +70,6 @@
           max_iteration: 200
         period: 10
       - pattern:
-          type: ColorWipe
+          type: Scanner
           color: *blue
         period: 100
\ No newline at end of file
diff --git a/src/patterns.rs b/src/patterns.rs
index c60428f..8cb3ba0 100644
--- a/src/patterns.rs
+++ b/src/patterns.rs
@@ -15,6 +15,7 @@ use crate::patterns::color_wipe::ColorWipe;
 use crate::patterns::fade::Fade;
 use crate::patterns::fill_random::FillRandom;
 use crate::patterns::fill_unstable::FillUnstable;
+use crate::patterns::rain::Rain;
 use crate::patterns::rainbow::Rainbow;
 use crate::patterns::scanner::Scanner;
 
@@ -28,12 +29,14 @@ pub(crate) enum Patterns<const N: usize> {
     FillRandom(FillRandom<N>),
     FillUnstable(FillUnstable<N>),
     Blink(Blink<N>),
+    Rain(Rain<N>),
 }
 
 pub trait Pattern : Iterator {
     type Strip;
 
-    fn init(&self) -> Option<Self::Strip>;
+    fn init(&mut self) -> Option<Self::Strip>;
+    fn is_last_iteration(&self) -> bool;
 }
 
 impl<const N: usize> Iterator for Patterns<N> {
@@ -48,6 +51,7 @@ impl<const N: usize> Iterator for Patterns<N> {
             Patterns::FillRandom(p) => p.next(),
             Patterns::FillUnstable(p) => p.next(),
             Patterns::Blink(p) => p.next(),
+            Patterns::Rain(p) => p.next(),
         }
     }
 }
@@ -55,7 +59,7 @@ impl<const N: usize> Iterator for Patterns<N> {
 impl<const N: usize> Pattern for Patterns<N> {
     type Strip = Strip<N>;
 
-    fn init(&self) -> Option<Self::Strip> {
+    fn init(&mut self) -> Option<Self::Strip> {
         match self {
             Patterns::Rainbow(p) => p.init(),
             Patterns::Fade(p) => p.init(),
@@ -64,6 +68,20 @@ impl<const N: usize> Pattern for Patterns<N> {
             Patterns::FillRandom(p) => p.init(),
             Patterns::FillUnstable(p) => p.init(),
             Patterns::Blink(p) => p.init(),
+            Patterns::Rain(p) => p.init(),
+        }
+    }
+
+    fn is_last_iteration(&self) -> bool {
+        match self {
+            Patterns::Rainbow(p) => p.is_last_iteration(),
+            Patterns::Fade(p) => p.is_last_iteration(),
+            Patterns::ColorWipe(p) => p.is_last_iteration(),
+            Patterns::Scanner(p) => p.is_last_iteration(),
+            Patterns::FillRandom(p) => p.is_last_iteration(),
+            Patterns::FillUnstable(p) => p.is_last_iteration(),
+            Patterns::Blink(p) => p.is_last_iteration(),
+            Patterns::Rain(p) => p.is_last_iteration(),
         }
     }
 }
diff --git a/src/patterns/blink.rs b/src/patterns/blink.rs
index 1df8f3e..f6ca981 100644
--- a/src/patterns/blink.rs
+++ b/src/patterns/blink.rs
@@ -17,9 +17,22 @@ pub struct Blink<const N: usize> {
 impl<const N: usize> Pattern for Blink<N> {
     type Strip = Strip<N>;
 
-    fn init(&self) -> Option<Self::Strip> {
+    fn init(&mut self) -> Option<Self::Strip> {
         None
     }
+
+    fn is_last_iteration(&self) -> bool {
+        match self.max_iteration {
+            None => { false }
+            Some(max_iter) => {
+                if self.current_iteration >= max_iter {
+                    true
+                } else {
+                    false
+                }
+            }
+        }
+    }
 }
 
 impl<const N: usize> Iterator for Blink<N> {
@@ -29,12 +42,10 @@ impl<const N: usize> Iterator for Blink<N> {
         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;
+                if self.is_last_iteration() {
+                    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()
diff --git a/src/patterns/color_wipe.rs b/src/patterns/color_wipe.rs
index af441bd..a8ff360 100644
--- a/src/patterns/color_wipe.rs
+++ b/src/patterns/color_wipe.rs
@@ -23,29 +23,43 @@ pub struct ColorWipe<const N: usize> {
 impl<const N: usize> Pattern for ColorWipe<N> {
     type Strip = Strip<N>;
 
-    fn init(&self) -> Option<Self::Strip> {
+    fn init(&mut self) -> Option<Self::Strip> {
         if let Some(color) = self.background_color {
             Some(Strip::<N>::new(color))
         } else {
             None
         }
     }
+
+    fn is_last_iteration(&self) -> bool {
+        match self.max_iteration {
+            None => { false }
+            Some(max_iter) => {
+                if self.current_iteration >= max_iter {
+                    true
+                } else {
+                    false
+                }
+            }
+        }
+    }
 }
 
 impl<const N: usize> Iterator for ColorWipe<N> {
     type Item = Strip<N>;
 
     fn next(&mut self) -> Option<Self::Item> {
+        if self.is_last_iteration() {
+            return None;
+        }
+
         let mut strip = Strip::default();
         if let Some(c) = self.background_color {
             strip.fill(c);
         }
         let iteration = self.current_iteration % N;
-        if let Some(max_iteration) = self.max_iteration {
-            if self.current_iteration >= max_iteration {
-                return None;
-            }
-        }
+
+
 
         for i in 0..iteration {
             strip[i] = Some(self.color);
diff --git a/src/patterns/fade.rs b/src/patterns/fade.rs
index 4bfeee6..d660846 100644
--- a/src/patterns/fade.rs
+++ b/src/patterns/fade.rs
@@ -8,7 +8,7 @@ use serde::{Serialize, Deserialize};
 pub struct Fade<const N: usize> {
     #[serde(default)]
     pub(crate) current_iteration: usize,
-    pub(crate) nbr_iterations: usize,
+    pub(crate) steps: usize,
     pub(crate) begin_color: PixelColor,
     pub(crate) end_color: PixelColor,
 }
@@ -20,9 +20,13 @@ fn fade_value(value_start: u8, value_end: u8, index: usize, nbr_iter: usize) ->
 impl<const N: usize> Pattern for Fade<N> {
     type Strip = Strip<N>;
 
-    fn init(&self) -> Option<Self::Strip> {
+    fn init(&mut self) -> Option<Self::Strip> {
         None
     }
+
+    fn is_last_iteration(&self) -> bool {
+        self.current_iteration >= self.steps
+    }
 }
 
 impl<const N: usize> Iterator for Fade<N> {
@@ -31,7 +35,7 @@ impl<const N: usize> Iterator for Fade<N> {
     fn next(&mut self) -> Option<Self::Item> {
         let mut strip = Strip::default();
 
-        if self.current_iteration >= self.nbr_iterations {
+        if self.is_last_iteration() {
             return None;
         }
 
@@ -39,19 +43,19 @@ impl<const N: usize> Iterator for Fade<N> {
             self.begin_color.red,
             self.end_color.red,
             self.current_iteration,
-            self.nbr_iterations,
+            self.steps,
         );
         let green = fade_value(
             self.begin_color.green,
             self.end_color.green,
             self.current_iteration,
-            self.nbr_iterations,
+            self.steps,
         );
         let blue = fade_value(
             self.begin_color.blue,
             self.end_color.blue,
             self.current_iteration,
-            self.nbr_iterations,
+            self.steps,
         );
 
         let current_color = PixelColor { red, green, blue };
diff --git a/src/patterns/fill_random.rs b/src/patterns/fill_random.rs
index c0d41a4..727b37a 100644
--- a/src/patterns/fill_random.rs
+++ b/src/patterns/fill_random.rs
@@ -11,26 +11,37 @@ pub struct FillRandom<const N: usize> {
     pub(crate) color: PixelColor,
     pub(crate) stability: usize,
     pub(crate) max_iteration: Option<usize>,
+    #[serde(default)]
+    pub(crate) current_iteration: usize,
 }
 
 impl<const N: usize> Pattern for FillRandom<N> {
     type Strip = Strip<N>;
 
-    fn init(&self) -> Option<Self::Strip> {
+    fn init(&mut self) -> Option<Self::Strip> {
         None
     }
+
+    fn is_last_iteration(&self) -> bool {
+        match self.max_iteration {
+            None => { false }
+            Some(max_iter) => {
+                if self.current_iteration >= max_iter {
+                    true
+                } else {
+                    false
+                }
+            }
+        }
+    }
 }
 
 impl<const N: usize> Iterator for FillRandom<N> {
     type Item = Strip<N>;
 
     fn next(&mut self) -> Option<Self::Item> {
-        if let Some(iteration) = self.max_iteration {
-            if iteration == 0 {
-                return None;
-            } else {
-                self.max_iteration = Some(iteration - 1);
-            }
+        if self.is_last_iteration() {
+            return None;
         }
 
         let mut strip = Strip::<N>::default();
@@ -55,6 +66,7 @@ impl<const N: usize> Iterator for FillRandom<N> {
             let c = PixelColor { red, green, blue };
             strip[i] = Some(c);
         }
+        self.current_iteration += 1;
         Some(strip)
     }
 }
\ No newline at end of file
diff --git a/src/patterns/fill_unstable.rs b/src/patterns/fill_unstable.rs
index 09331d9..4a39b4c 100644
--- a/src/patterns/fill_unstable.rs
+++ b/src/patterns/fill_unstable.rs
@@ -11,26 +11,37 @@ pub struct FillUnstable<const N: usize> {
     pub(crate) color: PixelColor,
     pub(crate) stability: usize,
     pub(crate) max_iteration: Option<usize>,
+    #[serde(default)]
+    pub(crate) current_iteration: usize,
 }
 
 impl<const N: usize> Pattern for FillUnstable<N> {
     type Strip = Strip<N>;
 
-    fn init(&self) -> Option<Self::Strip> {
+    fn init(&mut self) -> Option<Self::Strip> {
         None
     }
+
+    fn is_last_iteration(&self) -> bool {
+        match self.max_iteration {
+            None => { false }
+            Some(max_iter) => {
+                if self.current_iteration >= max_iter {
+                    true
+                } else {
+                    false
+                }
+            }
+        }
+    }
 }
 
 impl<const N: usize> Iterator for FillUnstable<N> {
     type Item = Strip<N>;
 
     fn next(&mut self) -> Option<Self::Item> {
-        if let Some(iteration) = self.max_iteration {
-            if iteration == 0 {
-                return None;
-            } else {
-                self.max_iteration = Some(iteration - 1);
-            }
+        if self.is_last_iteration() {
+            return None;
         }
 
         let mut strip = Strip::<N>::default();
@@ -52,6 +63,7 @@ impl<const N: usize> Iterator for FillUnstable<N> {
             blue = self.color.blue.saturating_sub(blue_delta);
         }
         strip.fill(PixelColor { red, green, blue });
+        self.current_iteration += 1;
         Some(strip)
     }
 }
\ No newline at end of file
diff --git a/src/patterns/rain.rs b/src/patterns/rain.rs
index 47a1c18..990e4ae 100644
--- a/src/patterns/rain.rs
+++ b/src/patterns/rain.rs
@@ -1,47 +1,81 @@
-use crate::patterns::PixelColor;
+use rand::Rng;
+use crate::patterns::{Pattern, PixelColor};
 use crate::Strip;
 use serde::{Serialize, Deserialize};
 
-/// # scanner pattern
-/// color one pixel with a color and leave a train of this color fading to black
+/// # rain pattern
+/// randomly fall colors from top or bottom.
+///
 ///
 /// # note
 ///
-/// background_color work only for color not set by scanner pattern
+/// `stability` is the probability (between 0 an 1) that any led will light on.
+/// The probability of at least one led light on is `stability*number of lines`
+///
+/// this pattern works only for 5x5 square
 #[derive(Serialize, Deserialize, Debug, Eq, Hash, PartialEq, Copy, Clone)]
-pub struct Scanner<const N: usize> {
-    #[serde(default)]
-    current_iteration: usize,
+pub struct Rain<const N: usize> {
     pub(crate) color: PixelColor,
     pub(crate) background_color: Option<PixelColor>,
+    pub(crate) max_iteration: Option<usize>,
+    #[serde(default)]
+    pub(crate) current_iteration: usize,
     pub(crate) stability: usize,
+    pub(crate) lines: usize,
     #[serde(skip)]
-    strip : Strip<N>,
+    drops : Strip<N>,
 }
 
-impl<const N: usize> Iterator for Scanner<N> {
+impl<const N: usize> Pattern for Rain<N> {
+    type Strip = Strip<N>;
+
+    fn init(&mut self) -> Option<Self::Strip> {
+        if let Some(color) = self.background_color {
+            self.drops = Strip::<N>::new(color);
+            Some(Strip::<N>::new(color))
+        } else {
+            None
+        }
+    }
+
+    fn is_last_iteration(&self) -> bool {
+        match self.max_iteration {
+            None => { false }
+            Some(max_iter) => {
+                if self.current_iteration >= max_iter {
+                    true
+                } else {
+                    false
+                }
+            }
+        }
+    }
+}
+
+impl<const N: usize> Iterator for Rain<N> {
     type Item = Strip<N>;
 
     fn next(&mut self) -> Option<Self::Item> {
         let mut strip = Strip::<N>::default();
-        if let Some(c) = self.background_color {
-            strip.fill(c);
-        } else {
-            strip.fill(PixelColor::default());
-        }
 
-        let current_led = self.current_iteration % N;
-        let min_led;
-        if current_led < 8 {
-            min_led = 0;
-        } else {
-            min_led = current_led - 8;
+        for i in 0..(N-self.lines) {
+            strip[i+self.lines] = self.drops[i];
         }
-        let mut c = self.color;
-        for i in min_led..current_led {
-            strip[i] = Some(c);
-            c = c / 2;
+        let mut rng = rand::thread_rng();
+        for i in 0..self.lines {
+            if rng.gen_bool(self.stability as f64 / 100 as f64) {
+                strip[i] = Some(self.color);
+            } else {
+                let c = strip[i+self.lines];
+                if self.background_color != c && c != Some(PixelColor::default()) {
+                    strip[i] = Some(strip[i+self.lines].unwrap()/ 2);
+                } else {
+                    strip[i] = self.background_color;
+                }
+            }
         }
+        self.drops = strip.clone();
+
         self.current_iteration += 1;
         Some(strip)
     }
diff --git a/src/patterns/rainbow.rs b/src/patterns/rainbow.rs
index 629e896..590f9af 100644
--- a/src/patterns/rainbow.rs
+++ b/src/patterns/rainbow.rs
@@ -23,19 +23,30 @@ pub struct Rainbow<const N: usize> {
 impl<const N: usize> Pattern for Rainbow<N> {
     type Strip = Strip<N>;
 
-    fn init(&self) -> Option<Self::Strip> {
+    fn init(&mut self) -> Option<Self::Strip> {
         None
     }
+
+    fn is_last_iteration(&self) -> bool {
+        match self.max_iteration {
+            None => { false }
+            Some(max_iter) => {
+                if self.current_iteration >= max_iter {
+                    true
+                } else {
+                    false
+                }
+            }
+        }
+    }
 }
 
 impl<const N: usize> Iterator for Rainbow<N> {
     type Item = Strip<N>;
 
     fn next(&mut self) -> Option<Self::Item> {
-        if let Some(nbr_iteration) = self.max_iteration {
-            if nbr_iteration == self.current_iteration {
-                return None;
-            }
+        if self.is_last_iteration() {
+            return None;
         }
         let mut strip = Strip::default();
         let step = self.step.unwrap_or(255 / N);
diff --git a/src/patterns/scanner.rs b/src/patterns/scanner.rs
index 73b74e1..bfd2022 100644
--- a/src/patterns/scanner.rs
+++ b/src/patterns/scanner.rs
@@ -14,29 +14,49 @@ pub struct Scanner<const N: usize> {
     pub(crate) current_iteration: usize,
     pub(crate) color: PixelColor,
     pub(crate) background_color: Option<PixelColor>,
+    #[serde(default)]
+    pub(crate) max_iteration: Option<usize>,
 }
 
 impl<const N:usize> Pattern for Scanner<N> {
     type Strip = Strip<N>;
 
-    fn init(&self) -> Option<Self::Strip> {
+    fn init(&mut self) -> Option<Self::Strip> {
         if let Some(color) = self.background_color {
             Some(Strip::<N>::new(color))
         } else {
             None
         }
     }
+
+    fn is_last_iteration(&self) -> bool {
+        match self.max_iteration {
+            None => { false }
+            Some(max_iter) => {
+                if self.current_iteration >= max_iter {
+                    true
+                } else {
+                    false
+                }
+            }
+        }
+    }
 }
 
 impl<const N: usize> Iterator for Scanner<N> {
     type Item = Strip<N>;
 
     fn next(&mut self) -> Option<Self::Item> {
-        let mut strip = Strip::<N>::default();
-        if let Some(c) = self.background_color {
-            strip.fill(c);
+        if self.is_last_iteration() {
+            return None;
+        }
+
+        let mut strip : Strip<N>;
+
+        if let Some(color) = self.background_color {
+            strip = Strip::new(color);
         } else {
-            strip.fill(PixelColor::default());
+            strip = Strip::default();
         }
 
         let current_led = self.current_iteration % N;