RAD the robot hack - was: subsumption

I thought I'd break this out into a new thread. I am hacking a RAD robot base, and if anyone is interested, there are several of these at
auction on ebay and going for prices that are an absolute steal. One auction ends in 4 hours, and the current bid is just $7.50 ....
http://toys.search.ebay.com/RAD-robot_Toys-Hobbies_W0QQcatrefZC6QQcoactionZcompareQQcoentrypageZsearchQQcopagenumZ1QQfposZ80304QQfromZR10QQfsooZ1QQfsopZ1QQftrtZ1QQftrvZ1QQsacatZ220QQsadisZ200QQsargnZQ2d1QQsaslcZ2QQsbrftogZ1QQsofocusZunknownQQsubmitsearchZSearch
or goto www.ebay.com, and search on "RAD robot" under toys. Maybe get some action on the bidding.
==================RMDumse wrote:

Randy, I am hacking a RAD base as mentioned above, and it's just for indoors use. It's good-sized at 12"x12", but I don't think it would go especially well over uneven terrain.
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dan michaels wrote:

Looks there are different revisions. I saw a V2.0 and V4.0 on the ebay site. Which one do you have? Do you know if there are significant differences between them?
Looks a bit like it is tracked, like Jonny Five. Is that right?
-- Randy M. Dumse www.newmicros.com Caution: Objects in mirror are more confused than they appear.
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RMDumse wrote:

A little bit like Johnny-5. There seem to be 4 different RADs. Original RAD has the flattish lizardy head, and what I got in the first auction. They're older and sell for more. I think $200 new originally. RAD2.0 is very similar to RAD, but has a doggie-elfish head, and has more flashing lights. Otherwise, it seems to be the same as RAD.
RAD3 and RAD4 appear to be much smaller, with different head. RAD3 is tracked, I think, and RAD4 a walker, I think. There have been a lot of RAD2.0's on auction over the past 2 1/2 weeks since I started tracking them.
I've talked to a couple of guys with these things, who never wanted to hack them - not wanting to destroy the unity of the devices - so they just sit in the closet. I wanted a hack-base, so I immediately took the thing apart, and discovered it's trivial to remove the top unit without damage, and to hack the base without drilling any holes at all. Making it a regular mobile base, see here for starters ...
http://www.oricomtech.com/projects/rad-hack.htm
Probably not good for outdoors, but can run all over the house - except the stairs.
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dan michaels wrote:

Ah! Now I get it. That is a great base. Nice pictures.
-- Randy M. Dumse www.newmicros.com Caution: Objects in mirror are more confused than they appear.
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No, it's on wheels that just happen to be in foot-shaped housings. But the legs/feet don't move at all. Dennis brought a RAD2 and a RAD4 to the last FRR meeting -- from what I've seen, RAD2 is by far the best model. The RAD4 can't move its arms at all, nor bend at the waist.
Best, - Joe
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Joe Strout wrote:

Right. I was supposed to have said RAD3 had wheels instead of tracks. Too bad, looks like they started with a really well-designed bot with the first R.A.D. and RAD2.0, and then went cheap with the later ones. The first 2 are very well made for toys. You should try a higher bid than $7 for a RAD2.0, Joe :).
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The problem is the shipping -- some of these guys want $30 or $40 shipping, which makes it well beyond my impulse-buy limit. But maybe I'll start snooping around local garage sales (when garage-sale season starts up again); I could pay considerably more if I could just toss it in the car.
Best, - Joe
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Joe Strout wrote:

Most for shipping I saw was about $17. Try talking Dennis out of one of his :).
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You might like what we have done with our RAD 2.0:
http://www.rjunkworks.com/IEEEMRSC/ieeemrsc.html
We got ours for $10.00 from a neighbors garage sale. It has built into it some very nice H-Bridges that are TTL input with a TTL current limit output to boot. I did some "Brain Surgery" to him and removed his upper brain functions (original u-processor) and injected my own TTL signals into his low mobility brain functions (inputs to H-bridge). I call it "Band-Saw Engineering" since I just trace the circuit out and cut out the sections of it with my band-saw that intrest me. All the "heavy lifting" of circuit design is still with the original engineer. RAD 2.0 can now run from the printer port of our laptop (do a Google on "parapin").
Travis Wood http://www.rjunkworks.com /

http://toys.search.ebay.com/RAD-robot_Toys-Hobbies_W0QQcatrefZC6QQcoactionZcompareQQcoentrypageZsearchQQcopagenumZ1QQfposZ80304QQfromZR10QQfsooZ1QQfsopZ1QQftrtZ1QQftrvZ1QQsacatZ220QQsadisZ200QQsargnZQ2d1QQsaslcZ2QQsbrftogZ1QQsofocusZunknownQQsubmitsearchZSearch
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Kathy and Travis Wood wrote:

Thanks for the link, Travis. My previous efforts at tracking down RAD-hacks on google didn't turn up very much.
One thing I did notice is that it's actually possible to build a bot with this base no more than 3 1/2" tall. I used the upper part of the base unit as part of my platform, but that could also be discarded and a flat deck simply mounted to the existing holes in the lower part of the base. Looks similar to what you did for mounting your notebook PC.
Also, after some fiddling I discovered the motors draw less than 1-Amp under heavy load, so I just used a standard h-bridge chip to drive them, and left the entire upper unit intact. Don't have any bandsaws around here.
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