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Driving three or four channels of motors

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Old 02-02-2008, 03:11 PM
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CrunchyFrog
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Default Driving three or four channels of motors

Dirt cheap is the only way I can engage in any hobby at all for now.

Can the radio sets I see in a hobby store drive the fifty-cent generic motors I've pulled from r/c cars ? I might actually buy a hobby-grade tx-rc setup--if it could do that. Do the channels tend to be specific as to whether they drive a servo or a motor? Is there a brand name that makes what I'm looking for ?

It's for my sub, whose "servos" (reappropriated motors) are out in the wet areas. When it comes to using a $12 servo or using a "free" motor I've got lying around, I'll always risk a motor instead.




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Old 02-02-2008, 03:51 PM
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Default RE: Driving three or four channels of motors

You can't use a reciever as a ESC to control the motors RPM. You can however hook up as many ESC's you want to each channel. What are you trying to do?
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Old 02-02-2008, 11:12 PM
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Default RE: Driving three or four channels of motors

I'm trying to run three channels:

1. Forward/stop/reverse drive motor (toy r/c car motor)
2. Rudder fins left / stop / right (using toy r/c car motor)
3. Diving fins up / stop / down (using toy r/c car motor)

I've been running with toy r/c car boards, and the ability to vary the speed isn't important--not even on the forward drive. I'm just wondering if I can upgrade to a hobby-grade tx-rx rig--and have each channel control one of my essentially free, scavenged motors, rather than a servo. Aren't servos about $10 - $20 apiece?
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Old 02-02-2008, 11:43 PM
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Default RE: Driving three or four channels of motors

So you are trying to drive a control surface using a electric motor. No it would not work. Servos use a small chip that tells the motor to stop at a certian spot so when you move your stick 75% up, the servo moves 75% of its travel. Your reciever/transmitter does't have this knowledge. Just buy a couple servos. A couple non ball bearing standered servos can be had for 14 bucks.
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Old 02-03-2008, 12:28 AM
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Default RE: Driving three or four channels of motors

Thanks very much!

I have to differ, though--I actually ran my sub satisfactorily last year with motors on the control surfaces. I configure stops at the ends of their travel.

I run the control-surface motors in the sub's "wet" area. Can't risk $28 worth of servos--that would shut me down the first time my servo sealant leaked. Even $10 apiece servos would be hard to do. But I've been doing it with a dollar's worth of wet motors each run.

I take it I wouldn't find a radio rx that would run three motors. That's what I'd buy at this point, if I could find somebody who makes it.

Thanks again !
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Old 02-03-2008, 09:25 AM
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Default RE: Driving three or four channels of motors

Interesting, than maybe it is possible. Did you have the thing set basically just setup for centered=motor off, left=motor on, and right=motor reversed?

Edit: Oh, BTW, servos aren't shot the second it leeks. All you have to do is dive and get the sub, take them out, and let them dry for a day or so. They should be good as new. I here of people recovering recievers, servos, and gyros from aircraft that crashed into water. You can also water seel them wich can be done using many different techniques
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Old 02-03-2008, 10:46 PM
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Default RE: Driving three or four channels of motors

I haven't gotten it sophisticated enough for a spring-loaded center position--for now it just has left and right. I should probably add the electronics were from toy Wal-Mart r/c cars.

Thanks for the tip about servos on sunken airplanes.
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