diff --git a/roulette/roulette.ino b/roulette/roulette.ino
index ce6cd89..9b07eac 100644
--- a/roulette/roulette.ino
+++ b/roulette/roulette.ino
@@ -1,25 +1,31 @@
 #define BUTTON 4
 int LED[] = {5, 6, 9, 10, 11};
-int val[5] = {255, 255, 0, 255, 255};
 
 #define DELAY 100
-#define STEP 100
-#define STOP 1000
+#define STEP 50
 
 
 bool isPressed() {
-  static bool last = 1;
-  int result = 0;
-  if (last == 1 && digitalRead(BUTTON) == LOW) {
-    result = 1;
+  // falling edge trigger
+  static bool last = true;
+  bool result = false;
+  if (last && !digitalRead(BUTTON)) {
+    result = true;
   }
   last = digitalRead(BUTTON);
   delay(1);
   return result;
 }
 
+void move() {
+  static int clk = 0;
+  for (int i = 0; i < 5; i++) {
+    digitalWrite(LED[i], clk % 5 != i);
+  }
+  clk += 1;
+}
+
 void setup() {
-  Serial.begin(9600);
   for (int i = 0; i < 5; i++) {
     pinMode(LED[i], OUTPUT);
     digitalWrite(LED[i], HIGH);
@@ -28,29 +34,29 @@ void setup() {
 }
 
 void loop() {
-  static int clk = 0;
   static int delay_time = DELAY;
-  static bool hit = 0;
+  static bool stopping = false;
   static unsigned long checkpoint = 0;
+  static int end = 0;
+  static int step = 0;
   if (isPressed()) {
-    hit = !hit;
-    if (!hit) {
-      delay_time = DELAY;
+    stopping = !stopping;
+    if (stopping) {
+      end = random(12, 17);
+      step = 0;
+    } else {
+      step = 0;
     }
-    Serial.println(hit);
   }
 
   if (millis() - checkpoint > delay_time) {
-    if (hit) {
-      delay_time += STEP;
+    if (!stopping || step < end) {
+      move();
     }
-    if (delay_time < STOP) {
-      for (int i = 0; i < 5; i++) {
-        analogWrite(LED[i], val[(i + clk) % 5]);
-      }
-      clk += 1;
+    if (stopping) {
+      step++;
     }
-    
     checkpoint = millis();
   }
+  delay_time = DELAY + step * STEP;
 }