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Need info on servo hookup, no radio?!?

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Old 05-15-2003, 01:40 AM
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Zomie
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Default Need info on servo hookup, no radio?!?

Well, I am working on designing a robotic hand for a school thing, I can do it with the servo's I got now but, I only got a 2 channel radio, and well with 4 servos its a bit hard.

How do I do the wiring and what is required just to wire the servo's directly to a switch, I don't need the radio.

I am not sure exactally how these three wires going about doing things, Thanks for any help please remember if this is a stupid question I am new here
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Old 05-15-2003, 11:29 PM
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strato911
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Default Need info on servo hookup, no radio?!?

No question is stupid, unless you don't ask it.

You can't just wire servos directly to a switch. The three wires are:
- power (4.0 - 6.0 Volts)
- ground
- signal (series of short 1 - 2 millisecond pulses representing the desired servo position).

In order to control servos without a transmitter and reciever, you will require a servo tester like those shown below (all clickable links), or some other electronics to generate the required signals. A 1.5ms pulse represents center on modern servos. The first one shown links to schematics to make your own.

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Old 05-15-2003, 11:52 PM
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Default Need info on servo hookup, no radio?!?

Thanks alot that helps so much, Thanks Alot!
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Old 06-13-2003, 07:39 PM
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Default Need info on servo hookup, no radio?!?

http://www.robotstore.com/catalog/list.asp?cid=17

http://www.ferrettronics.com/product639.shtml

http://www.rotomotion.com/prd_REV2.4.5DOFK.html


There are other sources out there as well for serial to servo circuits with Windows apps and APIs to get you started.

There was a good/simple one I came across last fall that wasn't very expensive. I will try to dig it up.
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Old 06-14-2003, 07:26 PM
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mikeatrpi
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Default Need info on servo hookup, no radio?!?

You can build your own PWM driver using a 555 timer and a couple of resistors, caps and a potentiometer. You can make it variable between 1 and 2ms.

A second solution is a microcontroller- check out Atmel AtMega8535 or similar. The 8535 gives you four channels for PWM output.
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Old 01-20-2004, 10:59 PM
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Default RE: Need info on servo hookup, no radio?!?

If your getting started in robotics get yourself a BASIC STAMP microcontroller. They can directly drive a servo and many other robotics projects and are easy to start with. Lots of information on them. Then when your ready to move up go with PIC microcontrollers. Visit this website and join their forum. They are a dedicated group to your interests.

http://www.seattlerobotics.org
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