Instructables

R/C LEGO 'Velocipede' Droid

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Picture of R/C LEGO 'Velocipede' Droid
RC2Wheeler003.jpg
RC2Wheeler007.jpg
tankDroid00.jpg
I built this 'Velocipede' Droid by using parts from existing LEGO® set  -  "Star War 7748, The Clone Wars Corp Alliance Tank Droid" (2009) and some other LEGO Technic Bricks, Plates. 

The original 7748 set (See Photo 4) contains 196 pieces. I used only 76 pieces out of 196 (approximately 38% of the set.) And I added 63 pieces using other LEGO Technic Bricks, Plates, etc.

My intension is to transform the Tank Droid into motorized robot by modified the T Pro SG90 servo to only use its motor (See Step 2 for the instructions.) And then use Palm Arduino Plus to control the motor controller (L293D) that is included on Palm Arduino Plus PCB.
And I use the XBee module to receive the commands from the computer wirelessly.

And here is how I built the 'Velocipede' Droid!

See video and more photos in Step 11.



Disclaimer:
LEGO®, TECHNIC, are property of The LEGO Group of Companies (http://www.lego.com), which does not sponsor, own, authorize or endorse this creation.
 
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Step 1: Parts & Tools

Picture of Parts & Tools
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LEGO Parts from "Star War - The Clone Wars Corp. Alliance Tank Droid" (#7748)

(Also shown in Photo 1)

2 nos. - Light Bluish Gray, Dish 10 x 10 Inverted (Radar) with SW Tank Droid Pattern (#4549191)
2 nos. - Light Bluish Gray, Dish 4 x 4 Inverted (Radar) (#4211664)
2 nos. - Dark Bluish Gray, Dish 2 x 2 Inverted (Radar) (#4211010)
3 nos. - Gear 24 Tooth (#4514558), Dark Bluish Gray

2 nos. - Red Technic, Liftarm 1 x 2 Thin (#4186678)
4 nos. - Light Bluish Gray Pneumatic T Piece New Style (T Bar) (#4211508)
2 nos. - Liftarm 3 x 5 L-Shape with Quarter Ellipse Thin (#4234247), Light Bluish Gray

2 nos. - Red Technic, Axle 2 Notched (#4142865)
2 nos. - Light Bluish Gray Technic, Liftarm 1 x 4 Thin with Stud Connector (#4211561)
3 nos. - 2x6 Plate (#4211002)

2 nos. - Light Bluish Gray Lever Small Base with Black Lever (#4221775)
2 nos. - Trans-Yellow Plate, Round 1 x 1 Straight Side (#3005744)
2 nos. - Two Blue Connector Peg/Cross Axle (#4206482)

4 nos. - Light Bluish Gray Arm Mechanical, Battle Droid (#4211658)
1 no.   - Black Technic, Axle Connector with Axle Hole (#4107081)
4 nos. - Dark Bluish Gray Minifig, Neck Bracket with Back Stud (#4210469)
2 nos. - Black Brick, Modified 1 x 2 with Studs on 2 Sides (#4253815)
2 nos. - Light Bluish Gray Technic Brick 1 x 2 with Axle Hole - New Style with X Opening (#4233493)

6 nos. - Black, Cone 1 x 1 without Top Groove (#4529236)
4 nos. - Black Technic, Pin Long with Friction Ridges Lengthwise and Stop Bush (#4140801)
4 nos. - Black, Round 2 x 2 with Axle Hole - New Style with X Opening (#403226)
2 nos. - Light Bluish Gray Technic, Pin 1/2 with 2L Bar Extension (Flick Missile) (#4520320)
4 nos. - Dark Bluish Gray Tile 1 x 2 with Groove (#4211052)
2 nos. -  1x2 Plate (#4211398), Light Bluish Gray
2 nos. - 1x4 Technic Brick (#370126), Black

2 nos. - Black Technic, Axle Connector (Smooth with x Hole + Orientation) (#4512363)
2 nos. - Black Bar 6L with Stop Ring (#4538722)
2 nos. - Black Technic, Axle and Pin Connector Perpendicular 3L with 2 Pin Holes (#4173970)
2 nos. - Light Bluish Gray Technic, Axle 3L (#4211815)
1 nos. - Cross Axle 6M (#370526), Black


LEGO Parts

(Also shown in Photo 2)

2 nos. - 1x10 Plate (#4477), White
2 nos. - 1x8 Plate (#3460), White
2 nos. - 1x6 Plate (#3666), Yellow

4 nos. - 1x4 Plate (#3710), White
2 nos. - 1x4 Plate (#3710), Light Bluish Gray
7 nos. - 1x4 Plate (#3710), Yellow

2 nos. -  1x2 Plate (#3023), Light Bluish Gray
2 nos. -  1x2 Plate (#3023), White

4 nos. - 1x1 Round Plate (#6141), Light Grey

4 nos. - 1x8 Technic Brick (#3702), Black
4 nos. - 1x6 Technic Brick (#3894), Black

6 nos. - 1x2 Technic Brick with Ø4.9 hole (#3700), Light Bluish Gray
4 nos. - 1x2 Technic Brick with Ø4.9 hole (#3700), Yellow
2 nos. - 1X2 Technic Brick with 2 holes Ø4,87 (#32000), Dark Bluish Grey

1 no.   - 2x2 Plate (#3022), Dark Bluish Gray

2 nos. - Cross Axle 3L with Stud (#6587), Light Bluish Gray
2 nos. - Cross Axle 6M (#3706), Black
1 no.   - Cross Axle 8M (#3707), Black

1 no. - Axle 2 Notched (#32062), Red

2 nos. -  1-1/2 Connector Peg (#32002)

2 nos. -  Bush for Cross Axle (#6590)

2 nos. - Two 8-Tooth Gear (#3647), Light Gray

1 no. - Pin Connector Round (#75535), Black

1 no.  - Yellow, Panel Fairing # 1 Large Short, Large Holes, Side A (#32190)
1 no.  - Yellow, Panel Fairing # 2 Large Short, Large Holes, Side B (#32191)


Servo

Servo horn glued to LEGO Cross Axle 3L with Stud (#6587)
2 nos. - 9g Micro Servo modified to be continuous rotational (Tower Pro SG92R, or T Pro SG90)
2 nos. - 3D Printed Servo Mount
(NOTE: The STL file for the servo mount (V01) is available for download here, for latest version (V06) that I used with this Wireless R/C Race Car. You can view the model or have it made at Shapeways, here.)

Others

3.7V Rechargeable LiPo battery or similar
7.4V 500mAh Rechargeable LiPo battery or similar

L293D (or SN754410) motors driver IC

Arduino or Arduino compatible 
NOTE: I used Palm Arduino Plus in this project, since it has Motor Controller (L293D/SN754410) slot added on the PCB.

Wireless Radios
Palm Arduino Plus has three options of wireless radio modules,
  • XBee module,
  • RN-XV WiFly module,
  • Bluetooth module.
I chose to use XBee module in this project, since I already have a couple of them in my possession. 
In order to use Xbee module or RN-XV WiFly module with Palm Arduino Plus we need extra breakout board, I used XB-Buddy Basic Kit (Jameco's Part no. 2163680) or similar.

Tools

The tools that I used in this project are:

Super Glue
Sand paper
Files
Solder iron and Solder station
Hookup Wire
Diagonal Cutter
Pliers
X-Acto Knife
Wire Stripper
SolderSucker