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This instructable provides a walk through of a basic servo driver using a 555 IC chip 5 resistors a transistor and 2 capacitors.  The idea is simple, use 2 switches to control the motion of the servo. Note this circuit is based on a servo tester circuit found on the Internet. We built this with parts from Jameco Electronics at an instructables build night at Arch Reactor Hackerspace. Thanks Jameco!

Step 1: The circuit

This is a diagram of what we are building. This and many other 555 circuits can be found on www.555-timer-circuits.com
<p>Hey I made this but instead of a 47k resistor I used a 10k potetiomiter</p>
<p>Hey, could you send me a pic of what you've done I cant get it to work. thanks</p>
<p>what type servo motor did you use? i mean 180 degree servo motor angle or continous servo motor? the list of component of the capacitor is 2 100nF or 1 100nF and 1 10nF?</p>
<p>what type servo motor did you use? i mean 180 degree servo motor angle or continous servo motor? the list of component of the capacitor is 2 100nF or 1 100nF and 1 10nF?</p>
<p>what type servo motor did you use? i mean 180 degree servo motor angle or continous servo motor? the list of component of the capacitor is 2 100nF or 1 100nF and 1 10nF?</p>
<p>Just out of curiosity, what frequency is the PWM being driven at? Roughly 10kHz?</p>
Nice project, please let me know when you got the wi-fi sorted. Thanks.
Very nice project. I presume you're sending two PWM signals corresponding to two servo positions - yes? I would think I could replace the two resistors and switches with a potentiometer that would allow me to drive the servo to any position. Is this right? <br> <br>Thanks for a cool project. <br>
You are correct. A potentiometer is an excellent idea as a replacement for the 2 push buttons. I am thinking of adding a WiFly to this so I can control the Servo via the internet.
THAT WOULD BE AWSOME IF YOU COULD ADD WIFI CONTROL
Nice idea and i like it so much.Welcome to cctv camera shop online http://www.gocctvshop.com/
Very nice. Are the resistor values chosen such that the servo turns faster forward than in reverse?
No it should be the same in either direction.
I was trying to do this circuit a couple of years ago as i wanted to use a brush-less model motor and propeller as a fan on my boat but when i found out i can buy a servo tester for $4.50 i just used them instead as the cost of 12 volt fans was around $15 for a cheep car one or $55 for a boat one and they only last around a year as the brushes always wear out but the model motors last forever and use less power to move more air plus i can control how fast they run which is great so they do not make as much noise as i leave some of them running all night.
Excellent Idea.
You have gone to quite a bit of trouble when you can buy a nice Turnigy servo tester at Hobby King for 6 bucks! http://www.hobbyking.com/hobbyking/store/__8296__Turnigy_Servo_Tester.html
Its nice to build once in a while instead of buy. I could have easily done this with an arduino too.
a great adaptable circuit for solar tracking (improved solar panel efficiency) or astronomical tracking. thanks.
Our robot group was looking for something simple/kool to do... I think this would be a good project for some of the new folks. thanks! great job!

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