www.robowars.org

RoboWars Australia Forum Index -> Technical Chat

Reprogramming Brushless ESCs - Complete - No Support Offered
Goto page Previous  1, 2, 3 ... 17, 18, 19 ... 50, 51, 52  Next

Post new topic   This topic is locked: you cannot edit posts or make replies.
  Author    Thread
marto
Experienced Roboteer


Joined: 08 Jul 2004
Posts: 5459
Location: Brisbane, QLD


 Reply with quote  

Completely different topic andrew. Smile
_________________
Steven Martin
Twisted Constructions
http://www.botbitz.com

Post Wed Apr 20, 2011 8:40 am 
 View user's profile Send private message Send e-mail MSN Messenger
Jaemus
Experienced Roboteer


Joined: 01 Apr 2009
Posts: 2674
Location: NSW


 Reply with quote  

Well the Banebots 3-9A ESC's work perfectly well with the common '1000rpm gearmotors' from virtualvillage/ebay most of us use. A few of us in NSW have run this setup on 4S with no issues but im not aware of anyone having gone above that.

I would suggest if the ratings are realistic that 15A is probably going to cover all the average beetle builder is going to ever need
_________________
<Patrician|Away> what does your robot do, sam
<bovril> it collects data about the surrounding environment, then discards it and drives into walls

Post Wed Apr 20, 2011 12:30 pm 
 View user's profile Send private message Send e-mail MSN Messenger
Jaemus
Experienced Roboteer


Joined: 01 Apr 2009
Posts: 2674
Location: NSW


 Reply with quote  

Also, im still interested in instant-reversible hacked BESC's for brushless motors used as drive motors, you mentioned this possibility initially
_________________
<Patrician|Away> what does your robot do, sam
<bovril> it collects data about the surrounding environment, then discards it and drives into walls

Post Wed Apr 20, 2011 12:31 pm 
 View user's profile Send private message Send e-mail MSN Messenger
seanet1310



Joined: 08 Nov 2006
Posts: 1265
Location: Adelaide


 Reply with quote  

quote:
Originally posted by Jaemus:
Also, im still interested in instant-reversible hacked BESC's for brushless motors used as drive motors, you mentioned this possibility initially


I can see a lot of issues with purerly instant. A lot quicker then standard delays (to the point you probably wont notice much over a standard DC) sounds more reasonable but a lot of work. I would first try and get the system so you can sense the brushless like the high cost industrial setups

I have ordered a bunch of besc's to start modding for DC soon, see how it goes.
_________________
Remember to trust me, I am an Engineer.

http://www.youtube.com/watch?v=rp8hvyjZWHs

Last edited by seanet1310 on Wed Apr 20, 2011 2:31 pm; edited 1 time in total

Post Wed Apr 20, 2011 12:50 pm 
 View user's profile Send private message Send e-mail Yahoo Messenger MSN Messenger
marto
Experienced Roboteer


Joined: 08 Jul 2004
Posts: 5459
Location: Brisbane, QLD


 Reply with quote  

Writing a brushed controller is trivial compared to a brushless controller I could spend weeks working on it and even then it might work with some motors and fail with others.

There is some code out there but for a reversible controller it would not be an easy task.
_________________
Steven Martin
Twisted Constructions
http://www.botbitz.com


Last edited by marto on Wed Apr 20, 2011 6:01 pm; edited 1 time in total

Post Wed Apr 20, 2011 1:47 pm 
 View user's profile Send private message Send e-mail MSN Messenger
Jaemus
Experienced Roboteer


Joined: 01 Apr 2009
Posts: 2674
Location: NSW


 Reply with quote  

when i say instant, i meant, without having to recenter the stick first

and yeah, fair call, just saying there's interest if you were wondering
_________________
<Patrician|Away> what does your robot do, sam
<bovril> it collects data about the surrounding environment, then discards it and drives into walls

Post Wed Apr 20, 2011 6:00 pm 
 View user's profile Send private message Send e-mail MSN Messenger
marto
Experienced Roboteer


Joined: 08 Jul 2004
Posts: 5459
Location: Brisbane, QLD


 Reply with quote  

Well I am interested in that as well its just probably bit out of reach with my current time allocations.
_________________
Steven Martin
Twisted Constructions
http://www.botbitz.com

Post Wed Apr 20, 2011 6:02 pm 
 View user's profile Send private message Send e-mail MSN Messenger
Jaemus
Experienced Roboteer


Joined: 01 Apr 2009
Posts: 2674
Location: NSW


 Reply with quote  

Fair enough, i know how that is Smile
_________________
<Patrician|Away> what does your robot do, sam
<bovril> it collects data about the surrounding environment, then discards it and drives into walls

Post Wed Apr 20, 2011 9:02 pm 
 View user's profile Send private message Send e-mail MSN Messenger
marto
Experienced Roboteer


Joined: 08 Jul 2004
Posts: 5459
Location: Brisbane, QLD


 Reply with quote  

For those of you who want instant feather controllers and don't want to wait for feather testing.

Well once again aaron has come up with an idea to help you and I have implemented it in 20min. lol

As we all remember many years ago brett did up a picaxe board for controlling relays. Well I have just modified my code to support exactly the same thing.

You will need 2 relays per board
- For high power - http://cgi.ebay.com.au/12V-4-PIN-SPDT-AUTOMOTIVE-RELAY-70A-80A-HID-12VOLT-AMP-/320681632977?pt=AU_Car_Parts_Accessories&hash=item4aaa1d64d1
- For lower power + leads - http://cgi.ebay.com.au/12VDC-Car-Audio-30-40A-Relay-Wire-Harness-Socket-SPDT-/260741869184?pt=AU_Car_Parts_Accessories&hash=item3cb56d2e80

And for each board a tz12a ( currently on supported on atmel)
- http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=11429

So what does that come out as.
4xtz12a = $33 + 10* relays = $28 .. comes to $61 dollars for two bot controllers. Obviously no PWM or anything buy hey you are now down to $15 per controller and can run it off pretty much any voltage with any motor and the most you are going to blow is a few relays which can be easily replaced. Only other additional component which might be necessary is a flyback diode. ($1 max for 10+)

Anyway I may have this running over easter brake Wink
_________________
Steven Martin
Twisted Constructions
http://www.botbitz.com


Last edited by marto on Thu Apr 21, 2011 4:50 pm; edited 2 times in total

Post Thu Apr 21, 2011 4:10 pm 
 View user's profile Send private message Send e-mail MSN Messenger
Knightrous
Site Admin


Joined: 15 Jun 2004
Posts: 8509
Location: NSW


 Reply with quote  

You need to use 2x 5 pin SPDT relays to make a h-bridge for each motor.
http://cgi.ebay.com.au/12V-5-PIN-SPDT-AUTOMOTIVE-RELAY-70A-80A-HID-12VOLT-/220765526473?pt=AU_Car_Parts_Accessories&hash=item3366a699c9
_________________
Team Knightrous

Post Thu Apr 21, 2011 4:27 pm 
 View user's profile Send private message
Spockie-Tech
Site Admin


Joined: 31 May 2004
Posts: 3160
Location: Melbourne, Australia


 Reply with quote  

Make sure the code only changes the relay states at 0% PWM for preventation of arcing and sticking in the relay contacts.
_________________
Great minds discuss ideas. Average minds discuss events. Small minds discuss people

Post Thu Apr 21, 2011 6:20 pm 
 View user's profile Send private message Send e-mail Visit poster's website MSN Messenger
marto
Experienced Roboteer


Joined: 08 Jul 2004
Posts: 5459
Location: Brisbane, QLD


 Reply with quote  

No PWM Brett. Its just a straight relay controller. So no real way to avoid arcing.

However.... if Nicks motor controller for his mag motor works out a similar principle with a pair of relays could be used to drive much larger motors with PWM control.

Steve
_________________
Steven Martin
Twisted Constructions
http://www.botbitz.com

Post Thu Apr 21, 2011 6:25 pm 
 View user's profile Send private message Send e-mail MSN Messenger
Fish_in_a_Barrel



Joined: 30 Sep 2006
Posts: 673
Location: Perth, Western Australia


 Reply with quote  

quote:
Originally posted by marto:
No PWM Brett. Its just a straight relay controller. So no real way to avoid arcing.


Diodes and capacitors for everyone!
_________________
They say that he crossed the fine line, from insanity to genius.

Post Fri Apr 22, 2011 11:20 am 
 View user's profile Send private message MSN Messenger
marto
Experienced Roboteer


Joined: 08 Jul 2004
Posts: 5459
Location: Brisbane, QLD


 Reply with quote  

Well been scratching my head with this code for past 2 days.

Turns out code was theoretically fine. I was just fighting the optimiser I think.
In any case this doesn't work.
if (rcTick) {
//Other stuff
rcTick = 0;
}

But this does......
if (rcTick) {
//Other stuff
}
rcTick = 0;
_________________
Steven Martin
Twisted Constructions
http://www.botbitz.com

Post Fri Apr 22, 2011 4:42 pm 
 View user's profile Send private message Send e-mail MSN Messenger
marto
Experienced Roboteer


Joined: 08 Jul 2004
Posts: 5459
Location: Brisbane, QLD


 Reply with quote  

Max slew rate.
http://www.youtube.com/watch?v=nEJlcYAuXps

Sorry for the format. I also have a current sensor setup.

So time to do a bit of testing.
_________________
Steven Martin
Twisted Constructions
http://www.botbitz.com

Post Fri Apr 22, 2011 6:57 pm 
 View user's profile Send private message Send e-mail MSN Messenger
  Display posts from previous:      

Forum Jump:
Jump to:  

Post new topic   This topic is locked: you cannot edit posts or make replies.
Page 18 of 52

Goto page Previous  1, 2, 3 ... 17, 18, 19 ... 50, 51, 52  Next

Forum Rules:
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

 

Last Thread | Next Thread  >
Powered by phpBB: © 2001 phpBB Group
millenniumFalcon Template By Vereor.