Subject:
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Re: Add motor driver to RCX
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Sat, 31 Jul 2004 16:31:17 GMT
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Viewed:
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3660 times
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In lugnet.robotics.rcx, Morten Høgholm Pedersen wrote:
> Have anyone tried to add an external motordriver to the RCX ports, so you
> can use the powerful 3Amp motors from the 8366 RC car on the RCX?
I'm working on a scheme to do that sort of thing.
I propose to use opto-couplers with their LEDs in reverse parallel, connected to
the RCX output, and their transistors driving a power H-bridge powered from a
separate supply. I can't see any other way of using a bidirectional 300mA PWM
signal to control a more powerful H-bridge.
My aim is to use it for trains, with a load of at least 4 train motors (1 Amp)
giving a target rating of 1.5 Amps, but the transistors to be rated
substantially higher to avoid the requirement for heatsinks. I could put the
circuit on each of the three RCX outputs and control 3 trains at once.
The idea would work equally well with a 3 Amp load, as long as you have big
enough power transistors. If it's a car or mobile robot, you'll need to carry a
substantial battery. For trains (or static robots) I can use a big PSU, since
it doesn't need to be carried :-)
Mark
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Message has 2 Replies:
 | | Re: Add motor driver to RCX
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| (...) Good idea. It will be difficult, though, to determine the differnce between braked and floating motor setting, or am I wrong? Or maybe one should measure the resistance on the RCX terminal, when no voltage is put out. I thought of invading the (...) (20 years ago, 1-Aug-04, to lugnet.robotics.rcx)
| | | Re: Add motor driver to RCX
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| (...) What does this mean in electrical novice terms? What is an auto-coupler? Is it possible to modify the reciever/power unit to interface with the RCX? ie maybe add an inferred recuever to interpret commands from the rcx to power the motors (...) (20 years ago, 5-Aug-04, to lugnet.robotics.rcx)
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Message is in Reply To:
| | Add motor driver to RCX
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| Have anyone tried to add an external motordriver to the RCX ports, so you can use the powerful 3Amp motors from the 8366 RC car on the RCX? (20 years ago, 26-Jul-04, to lugnet.robotics.rcx)
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