Hobby Servo Tester or Hobby Servo Controller
by Al Margolis, founder www.HobbyEngineering.com This simple circuit uses a 555 timer chip to provide the control signal required by common hobby servos. I started this project to help a robot builder who was having a hard time deciding if he had a bad servo or a software bug. It has also been used for interactive displays and for various gadgets where a hobby servo is a cost effective way to provide movement proportional to the turning of a knob.
|R1||15K ohm (brown, green, orange)||
|R3||220K ohm (red, red, yellow)||
|R4||10K ohm (brown, black, orange)||
|R5||10K ohm (brown, black, orange)||
|C1,C2||.01uf ceramic capacitor||
Additional Project Ideas For direct control application, you will probably want to replace the trimmer potentiometer (R2) with a full size potentiometer (available from Radio Shack and other sources).
End of Project This application note is a work in progress. If you found it interesting, awful or incomplete please let me know by sending email to