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Hobby Servo Tester or Hobby Servo Controllerby 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.Breadboard Layout Parts List
| IC1 | LM555CN |
1011 |
 | | Q1 | PN2222 |
1378 |
| | R1 | 15K ohm (brown, green, orange) |
1533 |
| | R2 | 10K Potentiometer |
1567 |
| | R3 | 220K ohm (red, red, yellow) |
1304 |
| | R4 | 10K ohm (brown, black, orange) |
1432 |
| | R5 | 10K ohm (brown, black, orange) |
1432 |
| | C1,C2 | .01uf ceramic capacitor |
1033 |
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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 toal@biznode.com.. |
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The content on this page was updated on 11/17/2004
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