Getting Started, Omnibot Hacking For Beginners

aliusa

USA
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Hi Guys,

When rummaging in the attic I found my old Omnibot with the remote and the original battery pack:) The battery is dead but I popped in two double A's and the digital clock still works. I was too young to really understand what I had was more than just a toy (I was 5 when I got it).

Anyway, I want to work on a project with my daughter. She's 7 but she's taken a real liking to electronics after I got her a snap electronics kit. Can anyone suggest a good project and what basic hardware I should purchases (servos, sensors, etc.) to get started.

Thanks,
Ali

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#27  
Bit the bullet purchased:
o EZ-Robot WiFi Developers Kit
o SeeedStudio L298 Dual H-Bridge Motor Driver
o DFRobot Assorted Jumper Wires Premium M / F Pack of 65
o DFRobot 7.4V Lipo 2200mAh Battery (Arduino Power Jack)
o 18W LiPo Battery Charger

Anything else I need to get started on my Omnibot while my wallet is still out:) ?
United Kingdom
#28  
It's knowing where to stop!

I had a budget for Melvin, I used that budget 5 times over already!

Spiral wrap is handy to have to keep wires neat, or tape...

Before
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After
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Protoboard, TIP122 transistors, resistors, header pins, solder, glue, filler, fibreglass, hot glue...
#29  
What does the front of Melvin look like?
#31  
For cutting the excess plastic around the head/eyes I will use a dremel but what do you suggest about smoothing out the plastic -- 200 grit sand paper?

The dome is scratched and beaten. I remember as a kid the painters dropped white paint on it too:) Any thoughts about smoothing that out?

Thanks,
Ali
United Kingdom
#32  
There are reports (however I've personally never managed it) that using toothpaste can remove scratches from the dome. Or sanding with 2500 grit wet & dry.

I haven't yet smoothed any of Melvin's plastic. The dremel tends to melt it anyway so it leaves a pretty neat edge. But yes, sand it, 200 moving up to 800 or 1000 should do it depending on how you finish it (paint?). You could go mad and go up to 2500 grit, polishing compound etc. but it's probably not needed if you paint it, in fact you want a slightly rough surface anyway for paint.
#33  
It has begun!


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I will start with the drivetrain. This is the H-Bridge I bought. Anyone have a tutorial for this one?


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#34  
I'm back and working on the OmniBot hack.

I liked how B.O.B. bot has the lights that flash along face plate. It's a sequential blinking. Do you guys have any recommendations for lights, led, rgb or anything else so I can mimic it.

Thanks!
#35  
For the head rotation, I initially removed the tabs but the head did not rotate freely, it kept hitting the sides. So I shaved off the plastic using a belt sander. I also added foam to create friction.

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PRO
Synthiam
#36  
Hey - that's exactly what i did. I used a dremel to cut the plastic around the head disc. I didn't cut it very smooth... yours looks better:D
#37  
You should use a standard servo for head rotation. Micro servo won't last very long. Trust this with my experience.
#38  
Thanks Dj!

rb550f, I already burned one out! :-)

I'm using the servos that came with the EZ-B Kit for the shoulder, elbow, and claw. The elbow and shoulder servos both make a lot of noise. Should I try replacing them or counter the weight some how?
PRO
Synthiam
#39  
Oh geez - i didn't notice it was a micro servo. I agree with @rb550f

The HDD servos are best to use for the arms and elbow. Are your servos HDD or HD from the kit? depends what version of the kit you have. Look at the servo label
PRO
Synthiam
#41  
HDD servos are the ones you want. The specs of the HDD servos are on the page that you linked to.

EZ-Robot Micro HDD's began shipping as of this month (February 2018).
PRO
USA
#42  
Oh that’s good to know on the micros! I need some if they are just as quiet as the standard HDDs
PRO
Synthiam
#43  
They are very very quiet
Canada
#44  
@fxrtst - Don't pull the trigger too quick! We're still working through the existing micro servo inventory. New Micro HDD's were used in complete robot builds that started as of last week. Loose micro's will still be the old ones for a bit.
PRO
Synthiam
#45  
Oooooh now that's good information to know:D Thanks alan!