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Offline SpiffyguyTopic starter

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$50 robot design
« on: March 20, 2008, 05:35:28 PM »
I wanted to get some opinions on my design before I start putting it together.  Experience is always the best voice.  Basiclly I am doing a revered trike.  Battery is underslung green board on top will be my electronics.  I a have not started that part yet.  The rear caster has me a bit worried, mainly because it is cheap and may lock up.  Will not really know until I try it though.  And I had them so no cost there.  I plan on putting the photoresitors in some sort of case and then mount them.  Maybe a ball point pen case?  Something along those lines.  What sort of angle do they need to be at?  I figure it is trial and error but a place to start would help.  Anyway if you see anything blatantly wrong please let me know.  I plan on starting construction next week.  Oh do I need to use a breadboard to zero out the servos or can that be done once all the electronics are completed?

Thanks

Front


Side.  the caster does rotate.  I am just not that good at sketchup yet


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Offline airman00

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Re: $50 robot design
« Reply #1 on: March 20, 2008, 09:36:28 PM »
angle of the photoresistors doesn't really matter , just make sure they are pointing slightly upwards to see light from above


to modify the servos you need to give them a pulse to "zero" or center them

You could center the servos after the circuit board is made ,you just need to change the code on the microcontroller
Check out the Roboduino, Arduino-compatible board!


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Offline SpiffyguyTopic starter

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Re: $50 robot design
« Reply #2 on: March 20, 2008, 09:53:24 PM »
ok cool.  I figure eventually I will a sharp IR or something else on the front end.  I will work on the circuit and get that done first.  Then center up the servos.  So the chassis looks ok though?

Offline airman00

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Re: $50 robot design
« Reply #3 on: March 20, 2008, 09:55:45 PM »
chassis looks good

is everything done to scale?
http://www.societyofrobots.com/member_tutorials/node/70
Check out the Roboduino, Arduino-compatible board!


Link: http://curiousinventor.com/kits/roboduino

www.Narobo.com

Offline SpiffyguyTopic starter

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Re: $50 robot design
« Reply #4 on: March 20, 2008, 10:03:13 PM »
yeah everything is pretty close.  I think the back wheel will need a spacer or two to keep the deck level with the front tires.  Kinda hard to tell with sketch up.  I wish it had a 3 pane view like some other modeling programs I have used.  But I got out my ruler and measured everything.  Deck is 4" wide and 8" long.

Offline airman00

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Re: $50 robot design
« Reply #5 on: March 20, 2008, 10:05:37 PM »
if you really want a 3 pane view then save it as a .dwg file from sketchup

and use a free DWG viewer to open it up. Vola , 3 views
Check out the Roboduino, Arduino-compatible board!


Link: http://curiousinventor.com/kits/roboduino

www.Narobo.com

Offline SpiffyguyTopic starter

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Re: $50 robot design
« Reply #6 on: March 21, 2008, 08:38:03 AM »
I may just have to do that.  just to get a figure on how far the back wheel is off the ground.  Sketch is not that bad to use.  I still have trouble with the move tool, getting it to go the right way.  which is why a 3 panel view would be cool.  Maybe they will add it one day.

 


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