diff --git a/src/schrittmotor.py b/src/schrittmotor.py
index 968ec1a..84ecabd 100644
--- a/src/schrittmotor.py
+++ b/src/schrittmotor.py
@@ -1,6 +1,8 @@
 from src.einstellungen import *
 import RPi.GPIO as GPIO
 import time
+import threading
+import math
 
 GPIO.setmode(GPIO.BCM)
 GPIO.setwarnings(False)