diff --git a/src/patterns.py b/src/patterns.py
index 4f5a370..2e1a589 100644
--- a/src/patterns.py
+++ b/src/patterns.py
@@ -23,6 +23,7 @@ class Patterns(PatternBase): # Inherit from PatternBase
             "o": self.off,
             "on": self.on,
             "bl": self.blink,
+            "cl": self.circle_loading,
         }    
         self.step = 0
         self.run = True
@@ -64,6 +65,79 @@ class Patterns(PatternBase): # Inherit from PatternBase
         self.run = False
         self.running = False
 
+    def circle_loading(self):
+        """Circle loading pattern - grows to n2, then tail moves forward at n3 until min length n4"""
+        self.run = True
+        head = 0
+        tail = 0
+        
+        # Calculate timing
+        head_rate = max(1, int(self.n1))  # n1 = head moves per second
+        tail_rate = max(1, int(self.n3))  # n3 = tail moves per second
+        max_length = max(1, int(self.n2))  # n2 = max length
+        min_length = max(0, int(self.n4))  # n4 = min length
+        
+        head_delay = 1000 // head_rate  # ms between head movements
+        tail_delay = 1000 // tail_rate  # ms between tail movements
+        
+        last_head_move = utime.ticks_ms()
+        last_tail_move = utime.ticks_ms()
+        
+        phase = "growing"  # "growing", "shrinking", or "off"
+        
+        while self.run:
+            self.wdt.feed()
+            current_time = utime.ticks_ms()
+            
+            # Clear all LEDs
+            self.n.fill((0, 0, 0))
+            
+            # Calculate segment length
+            segment_length = (head - tail) % self.num_leds
+            if segment_length == 0 and head != tail:
+                segment_length = self.num_leds
+            
+            # Draw segment from tail to head
+            color = self.apply_brightness(self.colors[0])
+            for i in range(segment_length + 1):
+                led_pos = (tail + i) % self.num_leds
+                self.n[led_pos] = color
+            
+            # Move head continuously at n1 LEDs per second
+            if utime.ticks_diff(current_time, last_head_move) >= head_delay:
+                head = (head + 1) % self.num_leds
+                last_head_move = current_time
+            
+            # Tail behavior based on phase
+            if phase == "growing":
+                # Growing phase: tail stays at 0 until max length reached
+                if segment_length >= max_length:
+                    phase = "shrinking"
+            elif phase == "shrinking":
+                # Shrinking phase: move tail forward at n3 LEDs per second
+                if utime.ticks_diff(current_time, last_tail_move) >= tail_delay:
+                    tail = (tail + 1) % self.num_leds
+                    last_tail_move = current_time
+                    
+                    # Check if we've reached min length
+                    current_length = (head - tail) % self.num_leds
+                    if current_length == 0 and head != tail:
+                        current_length = self.num_leds
+                    
+                    # For min_length = 0, we need at least 1 LED (the head)
+                    if min_length == 0 and current_length <= 1:
+                        phase = "off"  # All LEDs off for 1 step
+                    elif min_length > 0 and current_length <= min_length:
+                        phase = "growing"  # Cycle repeats
+            else:  # phase == "off"
+                # Off phase: all LEDs off for 1 step, then restart
+                phase = "growing"
+            
+            self.n.write()
+             
+        self.run = False
+        self.running = False
+
 #     def flicker(self):
 #         current_time = utime.ticks_ms()
 #         base_color = self.colors[0]
diff --git a/test/circle_loading.py b/test/circle_loading.py
new file mode 100644
index 0000000..f271cb5
--- /dev/null
+++ b/test/circle_loading.py
@@ -0,0 +1,128 @@
+#!/usr/bin/env python3
+"""
+Test script for circle loading pattern with multiple test cases
+Run with: mpremote run test/circle_loading.py
+"""
+
+import patterns
+import utime
+from settings import Settings
+from machine import WDT
+
+def run_test_case(p, test_name, duration_ms=5000):
+    """Run a test case for specified duration"""
+    print(f"\n--- {test_name} ---")
+    print(f"Parameters: n1={p.n1} head/sec, n2={p.n2} max length, n3={p.n3} tail/sec, n4={p.n4} min length")
+    print(f"Color: {p.colors[0]}")
+    print(f"Running for {duration_ms//1000} seconds...")
+    
+    # Initialize watchdog timer
+    wdt = WDT(timeout=10000)
+    wdt.feed()
+    
+    # Start pattern
+    p.select("cl")
+    
+    # Run for specified duration
+    start_time = utime.ticks_ms()
+    while utime.ticks_diff(utime.ticks_ms(), start_time) < duration_ms:
+        wdt.feed()
+        utime.sleep_ms(100)
+    
+    # Stop pattern
+    p.run = False
+    print(f"{test_name} completed")
+    
+    # Brief pause between tests
+    utime.sleep_ms(500)
+
+def test_circle_loading():
+    print("Testing circle loading pattern with multiple configurations...")
+    
+    # Load settings
+    settings = Settings()
+    
+    # Initialize patterns using settings
+    p = patterns.Patterns(
+        pin=settings["led_pin"], 
+        num_leds=settings["num_leds"], 
+        brightness=100,
+        delay=2000  # Base cycle time
+    )
+    
+    print(f"LED Pin: {settings['led_pin']}")
+    print(f"LEDs: {settings['num_leds']}")
+    print(f"Brightness: {p.brightness}")
+    
+    # Test Case 1: Your specified parameters
+    p.n1 = 50 
+    p.n2 = 100
+    p.n3 = 200
+    p.n4 = 0  
+    p.colors = [(255, 0, 0)]  # Red
+    run_test_case(p, "Test 1: n1=50, n2=100, n3=200, n4=0", 15000)
+    
+    # Test Case 2: Slow head, fast tail
+    p.n1 = 10  # Head moves 10 LEDs/second
+    p.n2 = 30  # Max length 30 LEDs
+    p.n3 = 20  # Tail moves 20 LEDs/second
+    p.n4 = 5   # Min length 5 LEDs
+    p.colors = [(0, 255, 0)]  # Green
+    run_test_case(p, "Test 2: n1=10, n2=30, n3=20, n4=5", 10000)
+    
+    # Test Case 3: Equal head and tail speed
+    p.n1 = 15  # Head moves 15 LEDs/second
+    p.n2 = 25  # Max length 25 LEDs
+    p.n3 = 15  # Tail moves 15 LEDs/second
+    p.n4 = 3   # Min length 3 LEDs
+    p.colors = [(0, 0, 255)]  # Blue
+    run_test_case(p, "Test 3: n1=15, n2=25, n3=15, n4=3", 8000)
+    
+    # Test Case 4: Very fast head, slow tail
+    p.n1 = 30  # Head moves 30 LEDs/second
+    p.n2 = 40  # Max length 40 LEDs
+    p.n3 = 5   # Tail moves 5 LEDs/second
+    p.n4 = 8   # Min length 8 LEDs
+    p.colors = [(255, 255, 0)]  # Yellow
+    run_test_case(p, "Test 4: n1=30, n2=40, n3=5, n4=8", 12000)
+    
+    # Test Case 5: Long segment, fast cycle
+    p.n1 = 25  # Head moves 25 LEDs/second
+    p.n2 = 60  # Max length 60 LEDs
+    p.n3 = 30  # Tail moves 30 LEDs/second
+    p.n4 = 2   # Min length 2 LEDs
+    p.colors = [(255, 0, 255)]  # Magenta
+    run_test_case(p, "Test 5: n1=25, n2=60, n3=30, n4=2", 10000)
+    
+    # Test Case 6: Very slow head, very fast tail
+    p.n1 = 5   # Head moves 5 LEDs/second
+    p.n2 = 20  # Max length 20 LEDs
+    p.n3 = 40  # Tail moves 40 LEDs/second
+    p.n4 = 1   # Min length 1 LED
+    p.colors = [(0, 255, 255)]  # Cyan
+    run_test_case(p, "Test 6: n1=5, n2=20, n3=40, n4=1", 8000)
+    
+    # Test Case 7: Medium speeds, short segment
+    p.n1 = 12  # Head moves 12 LEDs/second
+    p.n2 = 15  # Max length 15 LEDs
+    p.n3 = 18  # Tail moves 18 LEDs/second
+    p.n4 = 4   # Min length 4 LEDs
+    p.colors = [(255, 128, 0)]  # Orange
+    run_test_case(p, "Test 7: n1=12, n2=15, n3=18, n4=4", 6000)
+    
+    # Test Case 8: Ultra fast everything
+    p.n1 = 100 # Head moves 100 LEDs/second
+    p.n2 = 50  # Max length 50 LEDs
+    p.n3 = 150 # Tail moves 150 LEDs/second
+    p.n4 = 10  # Min length 10 LEDs
+    p.colors = [(128, 0, 255)]  # Purple
+    run_test_case(p, "Test 8: n1=100, n2=50, n3=150, n4=10", 5000)
+    
+    print("\n=== All tests completed ===")
+    
+    # Turn off LEDs
+    p.off()
+    print("LEDs turned off")
+
+if __name__ == "__main__":
+    test_circle_loading()