The R7 Droid Project


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When I say "movie robot" what's the first thing that comes to mind? If you're like most people, you are probably thinking "R2D2!" R2 has become something of a cultural icon, and I was looking for a new hobby. After exploring the EZ-Robot site and tackling my first project, an almost-complete Wall-E.
I decided it was time to dive in. After working my way through some of the advanced features that EZ-Robot offers, I began. It seems every day I learn another feature or function from the site, and it has served me well as I've progressed beyond Wall-E. Armed with this new knowledge, I decide to attempt my biggest project yet: a variation of the R2D2 droid,
called R7-M1.
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I began at the beginning of the year with nothing more than the vision in my head. Slowly and surely, I began to collect what I needed. Plans were downloaded, tools were purchased, styrene sheets was ordered. Using the blueprints I had made from the plans, I began to cut the styrene sheets into the feet skin, frame and legs using an Exacto knife.
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And how is the EZ-B controller being used in my project? I plan use to the growing features of EZ-B, with its own power supply in combination with an Xbox wireless controller to control the droid's sound and movement.
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A Syren 10 motor controller, powered by a 12 volt battery, is used to provide movement to the dome/head. Another two 12 volt batteries are powering two scooter motors, which are controlled by a Sabertooth 2x25 motor controller.
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The Ez-B controller is managing the control functions of the MP3 trigger, wireless joystick, Syren10, and Sabertooth2x25 , and also features a personality generator, voice recognition system, random sound and movement, and camera eye tracking.
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I'm looking forward to adding even more functions using sensors and other devices. Stay tuned for more to come!

By — Last update
I thought I would share how I put the drive wheels, scooter motor,and the motor belt all together.......the scooter motor will be connected to the Sabertooth 2x25...

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Hopefully soon, R7 will be walking........they grow up sooo fast..... :(
sick bra!

how tall is he? looking like 4 footer?
Hello to all my EZ-Robot friends......
Im sorry that I have been away for a while.

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"Golf Season" has started here for me and I was in desperate need to get my driver swing back into gear. Dont worry my friends, I managed to do some building in bewteen playing. So here is what I have manage to put together while golfing:

here, I worked on making the center foot from using some roller blade wheels
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I changed the design of the old set of legs I had, to a more sturdier set shown here
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I decided to work on my electrical board which consists in using : EZ-B controller, the Sabertooth 2x25, the Syren10, the MP3 Trigger, and the Sure 2x25 amp, a fuse block, some fuses and 14 gauge wire. NOTE: all the components are controlled by the EZ-B Controller using an XBOX wireless controller.
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Here, I started to put it all together
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and here is a tiny video on what my droid(Stan) can do now, by using the Ez-B controller with an Xbox wireless joystick

Click To Watch Video

More to come soon, Hopefully, I will be adding sensors so it doesnt bump into walls and move around freely without crashing or getting stuck.........

That is superb man! Your droid moves SO darn smooth! That is awesome!

That looks so cool...very professional!

All most ready to strap your clubs to him and off you go!


He is absolutely incredible!!!! Can't wait to see more pics and video
I'm amazed , I am going for.that kind of smooth , that sir is a smooth operator.

That is really a nice job on construction. Looks very professional.
I have a few questions when you get time.

1. How are you mounting / securing the motors?

2. Where did you get the nice casters? Looks like you changed out the castors for scooter wheels later on for the center foot. Am I right?

3. Does the ring gear for the dome come from the R2 Builders site? If not, where did that come from? It is so nice! Looks like originally you were using a scooter wheel to turn the dome.

4. What payload do you expect it can carry using the motors you installed? How much does he weigh now?

Wish I had your talent!
I think the guy that said SICK really Meant SLICK!


I really really like the motor beltdrive wheel system you have going there. Are the spherical casters on the legs there for weight distribution or because it looks uber cool or both?


Hello all,
thanks you for the kind responses on my progress, It is soooo exciting when you see your project up and working from the time you first laid it down on paper to the time you see it move for the first time.
To answer some questions:
For mounting the motors to the feet, I used this design which I found on yahoo
scooter motor foot ,
Materials used:
Wheels from here but I had to cut some of the hub off because it was a bit too wide User-inserted image

The front wheel caster are from and the rear casters are from ( the reason I used it for the rear is just in case the droid does a wheelie when it moves)
Belt: Belt Size: 405-3M-12
screws: 1-1/2 inch #8 32 thread machine screw and 2" Threaded Aluminum Post and the screws that came with the motor.
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The dome ring
I used a Lazy Suzan
and an A&A gear set which I did get from another builder. Mounted both with 1/4-20 screws
The motor I used are from Put all together it looks like this: User-inserted image

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As for the weight of it now, its probably about close to 40lbs now. when fully finished, Im guessing about 75lbs.

I need to start working on the Dome(head) soon and also start looking for paint. Doing the little extra detail parts are going to be pain but worth itin the long run.

But I am having trouble with the MP3 trigger, I need some help if anyone could provide please.
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then to the Ez-B controller. The problem is that when I insert the 1/8 jack into the input jack of the Mp3 Trigger, I get static noise. How can I get rid of the noise? Im hoping it not the input of the MP3 trigger cause that would mean I need to buy a new one. Any suggestions?

more to come soon
hey Bravia,
I tryed messing around with the connection. connecting and reconnecting, soldering and resoldering but nothing seems to work. As soon as I insert that 1/8 jack into the MP3 trigger, its like I get feedback and staic right away. I may think it could be a volume issue with the Mp3 trigger and the 2x25W @ 4 Ohm TPA3123 Class-D Audio Amplifier Board. I think the default settings on both are set high and I really dnt know how to lower them.

I know lots of us picked these up to solve our sound woes with
the J.E.D.I controller setups, VMusic2 and amplifiers.

Search E-Bay for :

Pac SNI-1 RCA Ground Loop Filter Isolator

Solved my issues with amps and humming/static noises.

-= Lumpy =-
You may also need a filter capacitor to ground.

Great news.... I solved my MP3 Trigger issue....
it turns out, it was a bad Audio Jack.

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So, I replaced it and yahooo!!, everything is working great!!

So now that was solved, I started working on the Dome Part(the head) of my droid
here is a picture of what I have done so far... but ... more to come....

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here is the eye
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I cant wait to see the next update!
Dang , that's awesome , I wish I had room for a bot like that. We all should meet one day , lol a ezb convention.
loooong trip for me lol
Well plan it when your home , or just set up a webcast lol.