diff --git a/scripts/speed_reader.py b/scripts/speed_reader.py
index a6f2f65..a981ea7 100644
--- a/scripts/speed_reader.py
+++ b/scripts/speed_reader.py
@@ -4,11 +4,10 @@ import datetime
 
 from scripts.speed_controller import rpm_control
 
-pulses_per_rotation = 1
+pulses_per_rotation = 4
 reader = Button(4, pull_up=False, bounce_time=0.0005)
 set_variable("speed_reader_last_impulse_time", datetime.datetime.now(), False)
 
-rpm_last = 0
 
 def event():
     actual = datetime.datetime.now()
@@ -18,8 +17,8 @@ def event():
 
     rpm = (60 / difference) / pulses_per_rotation
     
-    actual_rpm = (rpm_last + rpm) / 2
-    rpm_last = rpm
+    actual_rpm = (float(get_variable("actual_rpm_unfiltered")) + rpm) / 2
+    set_variable("actual_rpm_unfiltered", rpm, False)
 
     set_variable("actual_rpm", round(actual_rpm, 1), False)
     rpm_control()