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View Full Version : [Project] I did it! I made my first bot. Please don't laugh.



Electricity
08-06-2008, 06:50 PM
Please don't laugh, I am very poor and the materials I used are all stuff I scraped together. Check my blog (http://forums.trossenrobotics.com/blog.php?b=125) for a materials list.
Here are the first pictures of Trash.
http://i35.tinypic.com/2yy2mnq.jpg
http://i36.tinypic.com/w1ide.jpg
http://i33.tinypic.com/11b2emt.jpg
Sorry for the cell phone pictures.
I'm gonna have to get something stronger then plastic forks and chopsticks for legs, they flex rather then hold.
Ghetto enough for you?
Trash uses 4 hitech 311 servos as the knee joints, and 4 generic continuous rotation servos out of cheapo paintball hoppers. I havn't started with any coding for him yet, but once I remake the legs tomorrow (possibly with pens, or more chopsticks.) I plan on making a simple walking gait. The hard part is going to be figuring out how to get the hopper servos to do what they are supposed to. They only have + and - cables, so I'm going to have to figure out how to reverse the current. Any ideas would be appreciated. Otherwise I'll switch them with the hitechs, and just have them rotate 360* for each step..
The frame is a frame piece of an old computer cd drive case, 2 strips of wood I found, the front cover to said cd drive. The whole thing is held together with a crap ton of zip ties. I ran out of black towards the end, so there are some colored ones mixed in.. The sole of a shoe that I found (found the sole, not the shoe lol) is what the Arduino is sitting on, to prevent it from accidentally grounding out on something. I plan on installing 2 cheap flashlights as 'eyes' tomorrow for looks after i strengthen the frame.

Thoughts?

DresnerRobotics
08-06-2008, 06:57 PM
Forks. And Chopsticks.

This is the most fantastically ghetto robot I have ever seen in my life.

You're my new hero.

A-Bot
08-06-2008, 07:35 PM
That's killer. No description of your bot is complete without mention of the zip ties. I've seen RC cars bandaged together with zip ties, but your bot takes the cake! :)

What small mech box are you using?

ooops
08-06-2008, 08:47 PM
sweeeeet, but where is the duct tape???

Alex
08-06-2008, 08:52 PM
sweeeeet, but where is the duct tape???

You beat me to it by 1 minute!!

Seriously though Electricity, awesome ghetto bot:D Excellent display of making due with the materials you have (isn't there a word for that?)!

sam
08-06-2008, 08:54 PM
WOW!

It is awesomly resortful robot I have ever seen! I am always trying to buy new pieces, but instead I could use chop sticks, plastic forks and a lot of zip ties. (and as ooops mentionned, duct tape :p ).

I seriously like it a lot! I would like to see it moving. Keep us updated on the programing!

Sam

Alex
08-06-2008, 08:56 PM
resourcefulness! I knew there was a word for that, thanks Sam:D

Droid Works
08-06-2008, 09:44 PM
That is AWESOME! Very resourcefull and creative.I am very impressed with your imagination and passion for robotics. Send me a PM with your address and I will send you some hardware to help you fill up your robotics tool box.

Matt
08-06-2008, 11:39 PM
I LOVE it. Creativity is born of restraint in resources and there is piles of it here. I'm impressed with the ingenuity. You could maybe get a dremel and some thin flat sheets of wood for cheap to take it to the next level by hand crafting wooden parts. That would step up the strength. More detailed pics when you get the chance!

Matt
08-06-2008, 11:42 PM
Oh, and shouldn't this end up in DarkBacks junkbots competition?

Adrenalynn
08-07-2008, 12:52 AM
I don't think it matters what the bits are made out of... The design shows a command of the construction technique for this type of 'bot, and that's what it's really all about. You can cut leg pieces out of high density plastic or aluminum any time you want.

The stirrers in my paintball hoppers are motors instead of servos (hence the plus and minus sides) and would require motor controllers (and not be particularly accurate). They'll probably need to be replaced with servos. You've taken on a very aggressive budget project! Kudos!

Droid Works
08-07-2008, 01:10 AM
I started cleaning my lab and I so far have a bunch of goodies like micro controllers, dremil set, misc sensors and servos. I should have a nice little robotics kit for him. I cant wait to see what he does with it :)

Xan
08-07-2008, 03:24 AM
Cool Robot! I love the Getto feeling of this bot! I would like to see it lying fully camouflaged in some “trash” (read “usefull robotic parts”) And just on the moment that somebody passes, the “trash” starts moving and walking!! Awesome!!! I hope that you’ll get it walking very soon!!

As for reversing the +/- on the servos: I don’t know how the 2 wired servos work for positioning but if you only want to change current you could use 2 outputs for each motor. You can reverse +/- by driving one or the other output. Before you try it and possibility blow up the chip, look at the drain current for the controller. Hopefully your controller will have enough outputs.

Looking forward to see it walk!!

Xan

BADfish10
08-07-2008, 03:50 AM
That is very cool!
Robo-punk?
The use of materials should be an insperation to get more people into robotics!
there is somthing about that low budget bot that is just cool.
Again weldone cant wait to see it move

J

ScuD
08-07-2008, 04:11 AM
Mwuha, great stuff E'! :veryhappy:

One should never underestimate the power of tie-wraps in robotics!

I agree with Xan on the driving of the continuous rotation servo's, seems like they're basically converted as simple gearbox-dc motors and using two controller output pins would be the simplest way.
Your controller will most likely not be able to handle the currents though, and -please- use flyback diodes to drive it!

Lemme know if you need more info on the electronics backing to drive them, I'll make a lil' sketch with some easy to source (cheap?) components.

4mem8
08-07-2008, 05:41 AM
Amazing Electricity, Just amazing. Just goes to show what can be made if you think outside the box. Look forward to it walking

LinuxGuy
08-07-2008, 06:53 AM
Where's the VELCRO? ;) For W.A.L.T.E.R., I used velcro (or hook & loop for the generic name) to hold sensors in place when I was testing where I wanted them. It works extremely well for that and now I have the sensors mounted properly on W.A.L.T.E.R. v2.0 so they stay put. I've got SES compatible holes on the new decks based on where I had the sensors placed on W.A.L.T.E.R. v1.0.

8-Dale

gdubb2
08-07-2008, 10:00 AM
Originality and inventiveness..What more could anyone ask for.. I love it
Gary

darkback2
08-07-2008, 11:21 AM
Oh, and shouldn't this end up in DarkBacks junkbots competition?

You beat me to it.

Quick thing...Your first robot is a walker!? dude...I'm really impressed.

Oh...and PM me your address...I have some spare parts that need a home...like as in...yours.

DB

DresnerRobotics
08-07-2008, 11:24 AM
I would definitely recommend replacing those hip motors with actual servos that have positional feedback. Not a lot you can do with continuous rotation servos for a leg actuator.

Electricity
08-07-2008, 11:53 AM
hey thanks a lot guys for all the support! (and for not laughing:P) I'm really excited as to where this project will go. I think the next step is going to be exactly what Jodi said, I'm going to get me some scrap plywood, and dremel out better/stronger limbs. I think, atleast for the time being that I'm going swap the servos with the simple gearbox-dc motors, as Scud put it. That way the servos are the hip joints, and the motors are the knee joints, the feet will just have to spin 360* per step.
A special thanks to Darkback and Droid Works, seriously guys, you don't have to do that, but if you really want to, I've pmed you both my address. I can't tell you how much it means to me that you're both so willing to help me along.
I really appreciate it everyone!
-E
ps. Rep for everyone involved!

Adrenalynn
08-07-2008, 12:09 PM
Thanks! But credit where it's due: Matt first suggested dremeling up a couple legs from ply or similar.

I've seen some leg CAD drawings around here... Where'd they go...

A-Bot
08-07-2008, 12:19 PM
Did you say you have an airsoft shop in MD? If so, PM me... I want to check out some airsoft stuff. While I'm there I'd like to see your bot, and I'd be happy to drop you some extra servos, sensors etc that I'm not planning to use. :)

sam
08-07-2008, 12:53 PM
OH,

I hadn't seen that it was your first walker! Indeed, talking a walker for a first bot is impressive!

Good luck to you! :veryhappy:

Sam

ScuD
08-07-2008, 12:56 PM
Man this community is starting to become a giant robot part swap-market :veryhappy:

It's awesome what a group feeling there is on this forum.One more thanks to TRC for pulling this off!

And uhm E', keep us up to date on the progress!

Electricity
08-07-2008, 01:03 PM
Thanks! But credit where it's due: Matt first suggested dremeling up a couple legs from ply or similar.

I've seen some leg CAD drawings around here... Where'd they go...
Who ever said it first lol, its what I was planning on doing.. :p
however, that is a good idea stealing the cad drawings. I could print them out and use them as cutting guides.


Did you say you have an airsoft shop in MD? If so, PM me... I want to check out some airsoft stuff. While I'm there I'd like to see your bot, and I'd be happy to drop you some extra servos, sensors etc that I'm not planning to use. :)
Yes I do. I'll send you a pm.

crabfu
08-07-2008, 02:33 PM
WOW.... ok, laughing is ALWAYS a good thing in my books, especially in robots!!! so sorry, I laughed... I laugh big time, in the most wonderful way possible!!! Awesome... big brownie points for the creative materials used, and looks like I've got competition for the biggest fan of zip ties!!!! :) Can't wait to see it in action!!! and yes.... looks like perfectly suited for the junkbots competition!

-Crabfu

Matt
08-07-2008, 02:50 PM
I laughed too when I saw it. But it was a giddy delighted hand clapping laugh. To me projects like this rock because they fly in the face of all those big budget projects that eat up millions of dollars and end up with only something marginally better than the $1000 version.

So if you have some continuous turn servos I was thinking that maybe you could experiment with Whegs (http://biorobots.cwru.edu/projects/whegs/) designs? You could make the wheel legs out of hanger wire and use some plastidip (http://www.plastidip.com/home_solutions/Plasti_Dip) to make them grippy.

YouTube - mini whegs

Droid Works
08-07-2008, 02:57 PM
I was watching that show on the sci channel last night..lol When I get some free time I want to try out those leg/wheels on one of my bots.

ooops
08-07-2008, 04:00 PM
So if you have some continuous turn servos I was thinking that maybe you could experiment with Whegs (http://biorobots.cwru.edu/projects/whegs/) designs? You could make the wheel legs out of hanger wire and use some plastidip (http://www.plastidip.com/home_solutions/Plasti_Dip) to make them grippy.

Don't forget the duct tape!!!!:)

BADfish10
08-07-2008, 04:22 PM
I laughed too when I saw it. But it was a giddy delighted hand clapping laugh. To me projects like this rock because they fly in the face of all those big budget projects that eat up millions of dollars and end up with only something marginally better than the $1000 version.

So if you have some continuous turn servos I was thinking that maybe you could experiment with Whegs (http://biorobots.cwru.edu/projects/whegs/) designs? You could make the wheel legs out of hanger wire and use some plastidip (http://www.plastidip.com/home_solutions/Plasti_Dip) to make them grippy.

http://www.youtube.com/watch?v=BVjd042E7B4

Any one else think of the lugage from disk world when seeing that?
i like the one that hould jump up the stair that look very cool and a tad creepy

J

Electricity
08-07-2008, 05:14 PM
Those Whegs (http://biorobots.cwru.edu/projects/whegs/) are really cool! I think I'll try to whip something up right quick. A few high res pics of Mod1 of Trash before I, well, Trash her in an attempt to remake her with sturdier parts. :( Good bye Trash..
http://img135.imageshack.us/img135/5696/img0155po7.jpg
http://img380.imageshack.us/img380/5765/img0158mg9.jpg


http://img410.imageshack.us/img410/4651/img0156eg1.jpg

sam
08-07-2008, 05:35 PM
That bot is really nice! I just want to do it now! And it doesn't cost too much. Buy some nice continuous rotation servos and one mini one with a radio control. Just add a mini bot board and an atom with a PS2 controller and you've got the coolest radio controlled car!

She's a beaut your trash bot!

Sam

Electricity
08-07-2008, 06:59 PM
Check out my Whegbot here (http://forums.trossenrobotics.com/showthread.php?p=17643#post17643)
It was actually a lot of fun to build, and a blast to mess around with.
Trash is on the back burner until I can get some more servos.

revoltage
08-09-2008, 01:16 AM
Wow electricity for our first robot, I'm really impressed with your work. Hats off to you man :)

tom_chang79
08-25-2008, 12:30 AM
This is the kinda bot that McGuyver would piece together in a jam. Great work! I think this shows what a little bit of ingenuity and resourcefulness can do to make robot ownership a reality!

No one is laughing, I'm not. I actually applaud your resourcefulness...

RobotGrrl
09-15-2008, 01:29 PM
That is SOO COOL!!
I love the florescent thingys. What are they?

Adrenalynn
09-15-2008, 01:56 PM
Zipties. http://cgi.ebay.com/1000PCS-FLUORESCENT-4-8-COLOR-CABLE-WIRE-ZIP-TIES-NEW_W0QQitemZ170259612483QQihZ007QQcategoryZ14932Q QcmdZViewItem