diff --git a/interface_handler.py b/interface_handler.py
index f305629..ea1632f 100644
--- a/interface_handler.py
+++ b/interface_handler.py
@@ -158,7 +158,7 @@ class Interface_handler:
                     raise ValueError(str("pin %s is not a part of device %s",pin,device_name))
                 dutycycle = int(output[pin])
                 self.pwm_dutycycles[self.Pin[pin].value] = dutycycle
-                if not dutycycle in range(0,100,1):
+                if not dutycycle in range(0,101,1):
                     raise TypeError("value must be a whole number between 0 and 100")
                 self.pwms[self.Pin[pin].value].stop()
                 self.pwms[self.Pin[pin].value].start(dutycycle)