| Author |
Message |
Gordon Townley
Unregistered guest
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| Posted on Tuesday, August 29, 2006 - 7:00 pm: |
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hi Paul,
Having Problems with the MD03 speedo's .The first two i had I think were my fault, a stray strand of wire between the battery and motor terminals my have shorted the the fets , i have since tinned the cables.
The second pair i got last week ,one works perfectly but the other is only giving + or - 0.5v to the motor so it only just turns . I have swaped the controllers around and they still behave the same way.
Any ideas?
Gordon Townley |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 259
Registered: 10-2004
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| Posted on Thursday, August 31, 2006 - 7:07 am: |
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Gordon,
Recognising your experience and that the fault transfers when you swap speedos over, unless you have a dip switch problem then I would suggest returning the controller to us for inspection.
The dip switches should be 1 + 2 + 3 Off, 2 On which gives the RC failsafe option.
Regards
Paul |
Team Robotics (Teamrobotics)
Member
Username: Teamrobotics
Post Number: 1
Registered: 5-2006
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| Posted on Monday, May 22, 2006 - 3:35 pm: |
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Hi there,
Please when running the MD03 in R/C mode is there a feedback pot connection for position feedback ?
Would this also respond to the full pwm that a servo responds to ?
Im wishing to make big servo’s which I can control the position like I would a normal servo, I need to be able to control 12v linear actuators and 24v motors etc..
You see im building a replica of the Johnny Five Robot from the Short Circuit films of the 1980s
There is a large 12v motor that will be used to turn the waste… and the linear actuators are to turn the track units on end for when he is on tip toes etc, and the other two linear actuators for the lower and upper torso movements..
Thanks
Regards
Team Robotics |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 191
Registered: 10-2004
|
| Posted on Monday, May 22, 2006 - 6:38 pm: |
|
Hi,
The MD03 does not have a closed loop mode that can be used as a power servo. We do have two controllers that have this capability with an RC input and they are from our Pololu range (with feedback models).
Best to take a look at the respective full pdf specification document which should explain all. If you need any further help with those, we will endeavour to help.
Regards |
Team Robotics (Teamrobotics)
Member
Username: Teamrobotics
Post Number: 5
Registered: 5-2006
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| Posted on Friday, May 26, 2006 - 12:24 am: |
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hi there ive just been taking a further look, would it be ok to put the MD03 into R/C mode then drive a board from a R/C servo with the motor disconnected and the MD03 been feed from the output of that circuit ? this would then allow me to use the feedback circuit from the original servo.. should this work ? i would run the servo circuit board at 5v, i have just taken a look at the pololu circuits im not sure if i read them correctly with my quick browse over them but they appeared to not support enough Amps for my need, i did take a look at the Pololu 30A Motor Driver circuit thats what made me think about driving the MD03 from the motor terminals of the drive circuit removed from a standard size servo...
regards
TeamRobotics... |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 198
Registered: 10-2004
|
| Posted on Thursday, June 1, 2006 - 8:49 pm: |
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Hi,
I feel you may be making things more complicated than you need to.
If you put the MD03 into R/C mode, it will be looking for a 1-2mS RC signal. You say "then drive a board from a R/C servo with the motor disconnected and the MD03 been feed from the output of that circuit ? " do you mean connect the servo motor output to the MD03? A servo basically drives a motor until it achieves a balance between the RC input and the pot feedback. There is no RC output from the servo to go to the MD03. You could put the MD03 into voltage input mode and drive that from the motor connections on a servo but I imagine it would be rather crude.
I suggest you take a look at the Pololu 1503-006 SMC04 high power controller with feedback which is likely to meet all you your requirements and more. See http://www.technobots.co.uk/Technical/Electrical/Speed_Controllers/Pololu/1503.0 06.pdf for the data sheet on this controller.
Regards
Paul |
Frankdking (Frankdking)
Member
Username: Frankdking
Post Number: 1
Registered: 3-2007
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| Posted on Thursday, March 8, 2007 - 8:39 am: |
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There are some links in the MD03 - 50Volt 20Amp H Bridge Motor
Drive data sheets. These links do not appear to be working. Is there some other way to get the information? |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 427
Registered: 10-2004
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| Posted on Sunday, March 11, 2007 - 4:08 pm: |
|
Hi,
We had early problems embedding the links into the PDF files. Follow this link to see an html version where the links are active. Unable to Email you as you did not leave an Email address. |
