…555 timer “Ball Whacker”

by Stephen Hobley on October 10, 2011

Post image for …555 timer “Ball Whacker”

As another Radio Shack “Great Create” challenge I put together this fun project. A 555 timer and simple optical feedback loop creates a simple cybernetic control system.

The photocell in the tip of the arm responds to the light pattern falling across it – this in turn controls the position of the arm. Resulting in some amusing, and very human-like behaviour.

Check out the project details on the MAKE: Projects page:


{ 1 comment… read it below or add one }

Christian Deaton November 7, 2013 at 12:53 pm


I am trying to get the parts list… but would not show on the website… I need to know the model and part number for the servo motor and what diode did you use?



Leave a Comment

Comments links could be nofollow free.

Previous post:

Next post: