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-   -   How to control the minibot? (http://www.chiefdelphi.com/forums/showthread.php?t=89730)

yarden.saa 21-01-2011 16:08

How to control the minibot?
 
Hi,
We finished designing our mini bot but I thought on a problem.
How to get the motors work when we need(when it is on the tower)?
I thought of a touch sensor and NXT block to activate the motor but because we don't have FTC we don't have the motors controller(to get the minibot being controlled we need NXT block, touch sensor, motors, battery and the motors controller). So how can we solve this without this part?

JamesBrown 21-01-2011 16:21

Re: How to control the minibot?
 
Quote:

Originally Posted by yarden.saa (Post 1005141)
Hi,
We finished designing our mini bot but I thought on a problem.
How to get the motors work when we need(when it is on the tower)?
I thought of a touch sensor and NXT block to activate the motor but because we don't have FTC we don't have the motors controller(to get the minibot being controlled we need NXT block, touch sensor, motors, battery and the motors controller). So how can we solve this without this part?

You can use a light switch to control the bot without the need for the Controller. Design a mechanism to turn on the light switch when the minibot is in position to climb.

Jim.D 22-01-2011 00:46

Re: How to control the minibot?
 
Limit switches and common household light switches are legal items to control the motor if you dont want to use the NXT and motor controller.

dtengineering 22-01-2011 01:40

Re: How to control the minibot?
 
Is there a rule saying that the mini bot motors cannot be running at the start of the match?

I haven't seen it if there is... but then again, I haven't been keeping up with Q&A as closely as I sometimes do.

Now that I think about it, I'm not even sure where it says they have to stop at the end of the match, so long as you have a way of quickly getting the mini bot back down the pole.

Jason

Fletch1373 22-01-2011 09:12

Re: How to control the minibot?
 
Quote:

Originally Posted by dtengineering (Post 1005520)
Is there a rule saying that the mini bot motors cannot be running at the start of the match?

I haven't seen it if there is... but then again, I haven't been keeping up with Q&A as closely as I sometimes do.

Now that I think about it, I'm not even sure where it says they have to stop at the end of the match, so long as you have a way of quickly getting the mini bot back down the pole.

Jason

I'm not completely positive, but I don't believe there's a rule against that. However, doing so will most likely drain the minibot battery fairly quickly.

epic_wts 26-01-2011 21:05

Re: How to control the minibot?
 
Hi, I don't know if this would help, but you could probably use a deploy system, and then use a switch that would trigger once it touches the pole, causing the motors to activate and drive the minibot up the pole.

Al Skierkiewicz 27-01-2011 07:39

Re: How to control the minibot?
 
Jason,
I think this is the defining rule...
<G19> MINIBOTS must remain completely autonomous and move up the POST solely through electric energy provided after the start of DEPLOYMENT by the permitted, unaltered battery and converted to mechanical energy by the permitted unaltered motors (and associated, appropriate circuitry).
I think that implies that the motors may be running but the minibot may not move vertically until after the start of deployment. Q&A is the place to ask.
However, simple switches can be employed to start, reverse and stop the minibot if one thinks about it.

kitsume13 28-01-2011 12:33

Re: How to control the minibot?
 
Hey, Dose anyone know if we will be able to use a ladder to get the mini-bot down from the pole

DarrinMunter 28-01-2011 12:44

Re: How to control the minibot?
 
Quote:

Originally Posted by kitsume13 (Post 1010434)
Hey, Dose anyone know if we will be able to use a ladder to get the mini-bot down from the pole

I saw this on another thread. That you can not use a ladder, pole, or another type of tools to get the mini-bot down. And you must get it in a safe manner.

GaryVoshol 28-01-2011 15:16

Re: How to control the minibot?
 
GDC says no ladders: http://forums.usfirst.org/showthread...ghlight=ladder

But they haven't said if any other devices are allowed.

EDIT: And now they have said - see Team Update 6.

dotbran 28-01-2011 18:35

Re: How to control the minibot?
 
Are basic electrical components allowed for use on the minibot, like capacitors and photoresistors, to trigger and disable the robot?

pfreivald 28-01-2011 22:04

Re: How to control the minibot?
 
Quote:

Originally Posted by dotbran (Post 1010624)
Are basic electrical components allowed for use on the minibot, like capacitors and photoresistors, to trigger and disable the robot?

I don't see them on the list of allowable parts... (Indeed, I'd love it if we could use *regular* resistors...)

DarrinMunter 29-01-2011 00:14

Re: How to control the minibot?
 
Since a relay is like a switch are we allowed to use one in a custom circuit?
Not talking about a Spike relay, but a normal one.

The student that is in charge of the FIRST Q&A didn't show up tonight.

Al Skierkiewicz 29-01-2011 09:41

Re: How to control the minibot?
 
Guys the list of allowables on the minibot is very specific. Relays are not on the list, components like resistors and photoe sensors are not on the list, except those that are Tetrix parts when used with the NXT that are on the list here...http://www.usfirst.org/uploadedFiles...ix%20Parts.pdf

I have to ask, what would you use the resistor for?

pfreivald 29-01-2011 18:03

Re: How to control the minibot?
 
...to make it come back down nice and slowly under drive without a controller.


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