diff --git a/kitronic_06.py b/kitronic_06.py
index cce4dc0..50790bf 100644
--- a/kitronic_06.py
+++ b/kitronic_06.py
@@ -10,6 +10,7 @@ class Main:
     def __init__(self):
         self._debounce = {BUTTON_A: False, BUTTON_B: False}
         self._buttons = {BUTTON_A: button_a, BUTTON_B: button_b}
+        music.set_tempo(ticks=4, bpm=145)
 
     def main(self):
         while True:
diff --git a/kitronic_09.py b/kitronic_09.py
new file mode 100644
index 0000000..275b95d
--- /dev/null
+++ b/kitronic_09.py
@@ -0,0 +1,35 @@
+from microbit import *
+
+
+def main():
+    while True:
+        charge = pin0.read_analog() / 10
+        if charge >= 95:
+            pin1.write_digital(1)
+            pin2.write_digital(1)
+            pin8.write_digital(1)
+            pin12.write_digital(1)
+        elif charge >= 75:
+            pin1.write_digital(1)
+            pin2.write_digital(1)
+            pin8.write_digital(1)
+            pin12.write_analog(int((charge - 75) / 25 * 1023))
+        elif charge >= 50:
+            pin1.write_digital(1)
+            pin2.write_digital(1)
+            pin8.write_analog(int((charge - 50) / 25 * 1023))
+            pin12.write_digital(0)
+        elif charge >= 25:
+            pin1.write_digital(1)
+            pin2.write_analog(int((charge - 25) / 25 * 1023))
+            pin8.write_digital(0)
+            pin12.write_digital(0)
+        else:
+            pin1.write_analog(int(charge / 25 * 1023))
+            pin2.write_digital(0)
+            pin8.write_digital(0)
+            pin12.write_digital(0)
+
+
+if __name__ == "__main__":
+    main()