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Kd7lax
05-17-2005, 08:26 AM
Hi,
I am new to this robot thing.... but I have been into electronics for some time now.. and have designed and built a few PCB boards along the way.

But I am stumped this time !
I want to make a Mini-Sumo Bot so I thought I would buy a micro controller and then just design my own PCB board.... but I am confused at the difference between the http://www.parallax.com/detail.asp?product_id=27291 and this http://www.parallax.com/detail.asp?product_id=BS2-IC ?
can any one help me out here? I am not sure witch one I want.... are they the same thing?... I noticed the through-hole version has a Serial port built in?

also when building a sumo bot would I have to buy other components for my board? like a motor controller?

kb2hap
05-17-2005, 08:41 AM
Operation wise they are the same. physically they are much different.· One is a SMD component mount board pre-made which makes it much smaller.· The thru-hole mount board is much larger but some use the components to set the stamp directly into there design (mass production).· You could use an motor controller. I really depends on exactly what you whant to accomplish with you sumo-bot. You should really check out the listings below:

this gives you an idea and starts you off with micrcontrollers:
http://www.parallax.com/dl/docs/books/edu/wamv2_2.pdf

this is the Parallax robotics link:
http://www.parallax.com/html_pages/robotics/index.asp

this is the SUMO-Bot manual:
http://www.parallax.com/dl/docs/prod/robo/sumobotman.pdf

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DTQ

Kd7lax
05-17-2005, 10:52 AM
I want to accomplish building one for under $125.00 :)
I think I am just going to use cheapo servo's for the drive system... I am just going to use it to compete against a friend .. I don't know if I will ever use it in a compitition.
thanks.
Mike

Russ Ferguson
05-17-2005, 01:03 PM
Have you considered making a Mini-Sumo from the BS2-OEM board? If you have some proto board handy, you can pretty quickly mount the BS2-OEM on it for easy I/O connections. The BS2-OEM already has the serial connector on it, so just add a 4 cell battery pack and it is ready to take a program.
http://www.parallax.com/detail.asp?product_id=27291
Sale price is $30.
The two pictures may give you some ideas about what can be done.

Kd7lax
05-17-2005, 02:02 PM
Yeah thats what I was wondering ! thanks for the help.. :)
I confused about wich one to use the BS2-OEM or just the BS2-Chip now I know I can build it with the OEM through-hole version.

thanks guys!
any other info or tips on building sumo bots would be helpfull !
I need a parts list ( save on shipping by ordering it all at once) so if you guys could help me that would be great.

So far I have:
BS2-OEM board.
(2) QTI Sensors ( I think thoughs are the ones I should use )
Battery holder
Serial Cable
(2) Continuous Rotation Servos

Any thing else?
thanks for the help
Mike

Russ Ferguson
05-17-2005, 08:38 PM
1. Buying the wheels that mount directly on the servos will save you alot of trouble.
http://www.parallax.com/detail.asp?product_id=721-00001-721-00002

2. The sumo needs sensors for the edge of the circle (which may be the QTI that you are talking about), but the photo resistors will work just fine:
http://www.parallax.com/detail.asp?product_id=350-00009

3. The sumo needs ensors for "seeking" the other sumo and the IR stuff works pretty good for that:
http://www.parallax.com/detail.asp?product_id=350-00014
http://www.parallax.com/detail.asp?product_id=350-00017

It is hard to beat the price of the BOE-BOT from Radio Shack to get all of this stuff. You may also want to wait for the next sale on the Parallax EBAY page. The BOE-BOT was recently listed with a "BUY-NOW" for $99.

Kd7lax
05-18-2005, 01:29 PM
OK,
the QTI sensors that I was talking about are just what I saw on this website http://www.parallax.com/detail.asp?product_id=555-27401 and it said they are made for detecting the white line for sumo bots.... but photo resistors are cheaper and if they do the same thing I will just go with them.

So when are they going to have there next ebay auction ? or do we just have to watch and wait ?

and also how do I know how long the sale will be on the OEM BS2 kit? or is it one of toughs for ever sales? I don't want to miss it but I am just trying to think off all the parts I need before hand.

I am still a little confused about the BS2.... so there are pin outs and what do I hook up to the pin outs? will they hook directly up to servo's and sensors? or will they hook up to another controller circuit ? I started to read the WAM but it was confuesing me even more :)

thanks for all your help guys!
oh and has any one used an Etch Circuit for there bots? I have a bunch of photo-board that I need to use up so I figured I could make it etched....... if any one has a circuit design let me know :)

-Mike

dandreae
05-18-2005, 11:56 PM
The servos connect directly to the I/O pins and they use Vdd and Vss.· The Red wire goes to Vdd, the white wire goes to the I/O pins, and the black wire goes to the Vss.· If you are controlling more than five servos you will need a servo controller.

Dave

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Dave Andreae

Tech Support
dandreae@parallax.com (mailto:dandreae@parallax.com)
www.parallax.com (http://www.parallax.com)



Post Edited (Dave Andreae (Parallax)) : 5/18/2005 4:15:51 PM GMT

Russ Ferguson
05-19-2005, 02:51 PM
KD7LAX:

Here is a schmatic·of·the experimental circuits used in the "Robotics with the Boe-Bot". The book will help you understand exactly how the sensors work and how the BS2 uses them.

The schematic is drawn so that a BS2 OEM is supposed to be plugged into connector 'J1'.

The QTI sensor array will be a very reliable sensor for detecting the edge of the circle. The photo resistors will require you to experiment until you get it working the way you want it.

Kd7lax
05-21-2005, 03:23 AM
Hi again!
thanks for all of your help...
I have a few more questions :)

ok so how many QTI sensors am I going to need? and how many IR transmitters/receivers am I going to need?

here is my list of things to get:
BS2-OEM board
(2) QTI Sensors
Battery holder
Serial Cable
(2) Continuous Rotation Servos
(?) IR transmitters/receivers
( custom made PCB board)
(custom made wheels)
(costom made body)
Download Programming software

One thing I am not sure of are my programming skills :) not sure if they are up to snuff or not.
If you think I need any thing else for the list let me know !

Thanks guys.
Mike

Russ Ferguson
05-21-2005, 10:26 AM
Mike:

I suppose that you could start out with one of each sensor.

You will have to decide how competative your robot is going to be. Every sensor that you have on a robot and that you can use effectively will make your robot better.

Building a robot is allot like getting an antenna for a radio. I may get a G5RV antenna and find that it does everything I need it to do. The antenna for your radio may need to be a vertical of some sort. You really need to establish some parameters of what you will need the robot to do and then design/spend accordingly.