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MBX - Team Knightrous - QLD
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Knightrous
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Joined: 15 Jun 2004
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Location: NSW


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MBX - Team Knightrous - QLD

Melty Brain eXperiement (MBX for short)

General Information:

Armour: 8mm/3mm steel, 5mm aluminium & 1mm stainless
Drive: 1 x 12v Winch motor @ 39.6v geared 3.6:1
Electronics: Spektrum + AVR ATMEGA168 + SSR + MMA2300D 250G Accelerometer
Batteries: 39.6v from 2 x 19.8v A123 MEC Packs
Weapon: Translational Spinner, 13.6kg @ 1500RPM = Lots of Kinetic energy
Weight: 10.8kg
Current Status - 90% complete for combat, needs code work and a few more fixtures

Achievements:
Launching an A123 Pack @ 100km/h out the shed door...
Bouncing the Spektrum RX of two walls of the shed...
Lasting 15 seconds before launching a vital component
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Team Knightrous


Last edited by Knightrous on Tue Feb 13, 2018 1:08 pm; edited 9 times in total

Post Thu Oct 16, 2008 9:22 pm 
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Knightrous
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Location: NSW


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Test Video - http://au.youtube.com/watch?v=9MJELJ2hewQ

Needs work, but it's progressing fairly well. It's come together amazingly fast in just 2 weeks...
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Team Knightrous

Post Thu Jan 15, 2009 4:30 pm 
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Knightrous
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Alright, problems...

The BAD news: I broke the 250G accelerometer... I can't get another replacement from Mouser till next week some time... Embarassed

The GOOD news: MBX still works without the accelerometer, and it seems to work better! It creeps around continuously (you have to make it turn repeatedly to keep it still), but it's a stack load easier to guide around now... I have no idea why this is working, it just is...

I'm just waiting for the battery to charge and will bolt the new lid on it and take another video.. Melty Brain without an accelerometer, who'd thunk it Razz
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Team Knightrous

Post Thu Jan 15, 2009 5:32 pm 
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Philip
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Joined: 18 Jun 2004
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Location: Queensland near Brisbane


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Are you able to aim at a target and hit it? Do you have a robot to test it against?
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Post Thu Jan 15, 2009 5:48 pm 
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Knightrous
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Location: NSW


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When it's working properly, yes, you can just line the LED header up with the opponent and keep chasing them until you collide. tracking at the moment is a bit of a bitch, as the voltage of the pack changes, the header looses / gains accuracy. I've got a few ideas to do to get it to work better, but I could really do with setting up an ADC on the AVR chip to read battery voltage and do adjustments in software... But I've no time to fiddle with that now, so will see what I can cook up...
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Team Knightrous

Post Thu Jan 15, 2009 7:12 pm 
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Knightrous
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Location: NSW


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Well it's all working now!
I changed the code to adjust the RPM manually (basically keep adjusting the throttle till the header LED stops rotating) and then it drives pretty well.
Have a video believe, which is a bit dark, but you can see it driving around Smile

http://au.youtube.com/watch?v=iSj6B_RslKU

I've just packed it in the suitcase, and I'm flying out at 5am tomorrow! I can't believe I have a working robot the 2 days before the event Shocked Will be interesting driving it in the Wacky Races Wink
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Team Knightrous

Post Thu Jan 15, 2009 9:28 pm 
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Valen
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Joined: 07 Jul 2004
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you do have a "not spinning" mode right?
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Mechanical engineers build weapons, civil engineers build targets

Post Thu Jan 15, 2009 10:54 pm 
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Knightrous
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Joined: 15 Jun 2004
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Location: NSW


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As much as a non-spinning mode can exist with only 1 wheel Wink
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Team Knightrous

Post Thu Jan 15, 2009 11:09 pm 
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Valen
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werghhh!
your insane, i never noticed
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Post Fri Jan 16, 2009 12:11 am 
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Knightrous
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Joined: 15 Jun 2004
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Location: NSW


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The MBX Report

Alright, a quick report before I disappear into the glow of a blue luxeon LED for a few months....

MBX worked really well for what it was (a glorified testbed built in two weekends), it was pretty lame in combat, as I spent most of the time adjusting the LED header due to the last minute hack to due to destroying the accelerometer before the event. It ran between 500 - 750RPM at various stages during the weekend and showed that it can pack a punch.

A brief list of things to do.

- move to two wheels - helps balance and spin up time, was only 1 wheel because of time restraints...
- more volts - after the event when I ran it on 12cells (39.6v) it was really kick ass, hitting around 1500rpm (but totally undriveable due to my current code limit of 1200rpm....)
- make it round - it ended up square because I built the thing in a day with what was laying around in the shed, next time it will be round for lower wind resistance, harder to jam in a corner and better for hitting with.


The future specs:

Armour: 3.2mm Hardox 450
Drive: 2 x 12v 340 Winch motor @ 33v geared 3.6:1
Electronics: Spektrum + AVR ATMEGA168 + SSR + MMA2300D 250G Accelerometer
Batteries: 1 x 33v (10cell) A123 Packs
Weapon: Translational Spinner, 13.6kg @ 1500RPM = Lots of Kinetic energy

I look forward to bringing a much better, combat ready version to the Ideas Festival.
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Team Knightrous

Post Mon Jan 19, 2009 9:09 pm 
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Knightrous
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Joined: 15 Jun 2004
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Location: NSW


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The last ditch "Lets put 40v in it and blow it up" test after the event, thanks to Glen for the video

http://au.youtube.com/watch?v=yz7JO2bhB7c

I'll be hacking the code tonight to hopefully get it to drive at those speeds Cool
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Team Knightrous

Post Tue Jan 20, 2009 6:09 pm 
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Knightrous
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Joined: 15 Jun 2004
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Location: NSW


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The spare Baby O arrived today, which is good because the other one is currently configured as an ignition cut rev limiter in my MR2 Razz I've made a start on the second gearbox and winch motor setup, might have it finished this weekend if I'm lucky. Just need to order another accelerometer or three and I can get back to work on the new code and a more functional combat version of the electronics.

Anyone know if tri-color Luxeons exist?
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Team Knightrous

Post Thu Feb 05, 2009 1:51 pm 
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dyrodium
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Joined: 24 Aug 2004
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Tricolours do exist, ledsales.com.au had some for a while, give the dude an email he's ultra fast with orders, or get them OS if you want. How much are accelerometers? I'm very interested to have a go lol. Smile
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Post Thu Feb 05, 2009 3:38 pm 
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Knightrous
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Joined: 15 Jun 2004
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Location: NSW


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Accelerometer is $14USD, with $30USD postage Evil or Very Mad Will have to wait till pay day to pick a pair up Sad
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Team Knightrous

Post Thu Feb 05, 2009 4:34 pm 
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Knightrous
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Joined: 15 Jun 2004
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Location: NSW


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Bit more progress. Finished the gearboxes today, made some new shafts and realigned the gears a bit. Layed the parts out and it looks like it's going to be nearly as compact as the 1 wheel version. I believe it should all wedge into a 350mm x 350mm hexgon or octagon shape.







Some rough calculations based on voltage, gearing and wheel base predict that it should hit 1250RPM, a good 500-600RPM more then it showed @ RoboWars. I'll have the accelerometer working this time, so it should be much much more driveable and it should translate faster with two wheels.

Will start on the hardox body next weekend.
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Team Knightrous

Post Sun Feb 15, 2009 7:14 pm 
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