Society of Robots - Robot Forum
Electronics => Electronics => Topic started by: Bajanick on June 08, 2008, 08:23:37 PM
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I would like to control 2 wheelchair motors with relays and implement skid steering as well. I plan on using a RC unit to remotely control the motors.
I built a circuit with 6 relays but it did not work. I dont need speed control, it would be nice but out of my budget.
The motors are 24V but I think they will run on 12V and the 2 batteries are 12V 7 amp hour each wired in series. I am going to do a test to see how
well the motors work under 12V. I remember reading on the wheelchair website that they work with 24 or 12V.
Thanks for any help.
:)
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Hi:
Yes. I have a H-bridge with speed control that I am sure is not out of your budget. It only needs 1 MOSFET and 1 relay per motor.
"I would like to control 2 wheelchair motors with relays and implement skid steering as well. I plan on using a RC unit to remotely control the motors."
If you can wait a week. I will be selling a chip that can interface a "VEX" (you can get them on Ebay for about $20) transmitter, receiver to the H-bridge. The chip will also be able to interface with other microcontrollers so that they can take over when the transmitter is off. It will be able to run up to 8 DC motors. You can see the H-bridge at my site:
http://robotics.scienceontheweb.net
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hello
you are doing exactly what I did with my butler robot chives - erobots.blogspot.com
Look on the right hand side of the blog , there should be something about relay controls
You need a total of 8 relays for this to work - four per motor .
post up your schematic and I'll help you out
what kind of R/C unit are you using , because you will probably need a MOSFET to drive the relays for certain R/C stuff
I have two 24V motors running at 12V just fine . Which motors are you using ?
The two 12V batteries need to be wired in parallel to give off 12V. How much current do your motors draw
and finally what project are you building , so we can help you out better.
Ask anything you want on this subject , because I am almost an expert on it ( I've done it before many times)
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My project is a radio controlled vehicle that I control with a RC unit using the bottom half of a wheelchair.
The batteries are rated 12V at 7amp hours each (It has 2), They are currently wired how they came on the WC but I will be rewireing them for 12V
operation.
I will be installing a camera and eventually some kind of gripper.
The main hurdle I am facing is finding a motor controller that is inexpensive and can handle the kind of amps these motors pull. I found one but
dont have the funds yet. I figured if I wired up some kind of simple relay control with no speed control thats better than nothing, until I can save up for
the controllers I need.
I did not see any links about relays on your site but I will keep looking.
Thanks.
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oh its not there, i thought i wrote something about it
if you can wait a day , I'll happily post a schematic of how to wire it