diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..d007bb1
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,6 @@
+Flask
+pillow
+opencv-python
+gphoto2
+gpiozero  
+scipy
diff --git a/scanner.py b/scanner.py
index 142e9b4..c58175e 100644
--- a/scanner.py
+++ b/scanner.py
@@ -4,7 +4,7 @@ from os.path import join
 import shutil
 import time
 import gphoto2 as gp
-
+from gpiozero import PWMLED
 from . import config
 
 # Delay between to captures
@@ -34,16 +34,19 @@ def capture(output_path: str) -> bool:
 
 def scan(output_dir: str):
     os.makedirs(output_dir, exist_ok=True)
-    for led in config.LEDS_UUIDS:
-        print(f'Turn on {led}')
+    gpio= PWMLED(17)
+    gpio.value = 0
+    for count,led in  enumerate(config.LEDS_UUIDS):
+        print(f'Turn on {count} {led}')
         img = join(output_dir, led + '.jpg')
 
         # Measure the time it takes to capture
         start = time.time()
-
+        gpio.value = count/len(config.LEDS_UUIDS)
         capture(img)
         # For debug purposes
         #shutil.copyfile(join('data-keep/small', led + '.jpg'), img)
+        gpio.value = 0
 
         delta = time.time() - start
 
@@ -51,5 +54,5 @@ def scan(output_dir: str):
         if delta < DELAY:
             time.sleep(DELAY - delta)
 
-        print(f'Turn off {led}')
+        print(f'Turn off {count} {led}')
         yield led