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The Coaster Droid or "CDroid" is a bigger version of R/C LEGO 'Velocipede' Droid that I built recently. And this one I want to add the sensor to it so it could avoid hitting the obstacles.

The "CDroid" uses LEGO® components similar to the previous built "LEGO® Track Bot", and "Dart Shooter Droid" uses the same vertical gearbox and base similar to Lego Track Bot. But instead of using the same triangle tracks, I used the CDs as the wheels, and use Hubs that I took them from toy car.
This Droid is capable of rotating it body to both left and right similar to Dart Shooter Droid. On top of the body I placed the IR distance sensor, so the Droid can avoid hitting the obstacle.

Here is the short description of the "CDroid":
- The robot is controlled by Arduino Compatible Board (Palm Arduino Plus).
- The robot is wirelessly communicating with Arduino via XBee module, RN-XV WyFly module or Bluetooth.
- The robot is equipped with IR Distance Sensor (Sharp - GP2Y0A21YK0F).
- The robot will automatically override the commands if it facing an obstacle.
- The body is made out of LEGO® Components.
- The wheels are made out of CDs.

See videos and more photos in Step 8.

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.

Step 1: Parts & Tools

Vertical Gearbox Support & Base Components
All the details for components to build the Vertical Gearbox Support & Base Components please see details at
R/C LEGO® Dart Shooter Droid, Step 1: Parts and Tools.

Double Gearbox Kit
Tamiya 70097 Twin-Motor Gearbox Kit or similar.

Servos
1 no.   - Sub-Micro Servo 3.7g (Pololu #1053) or similar.
 
Parts for Coaster Droid Body (Photo 1)

2 nos. - Liftarm 3 x 3 L-Shape with Quarter Ellipse Thin (#32249), Red
6 nos. - Liftarm 3 x 5 L-Shape with Quarter Ellipse Thin (#32250), Red

1 no.  - Panel Fairing # 7 Small Long, Large Hole, Side A (#32534), Red
1 no.  - Panel Fairing # 8 Small Long, Large Hole, Side B (#32535), Red

4 nos. - Panel Fairing # 5 Small Short, Large Hole, Side A (#32527), Red
4 nos. - Panel Fairing # 6 Small Short, Large Hole, Side B (#32528), Red

1 no.  - Technic  Block 3 x 5 x 1 2/3 (#32310), Red

2 nos. - Dish 2 x 2 Inverted (Radar) (#4740), Tan

2 nos. - Plate, Round 1 x 1 Straight Side (#30057), Transparent Green

1 nos. - Hose, Ribbed 7mm D. 4L (#78c04), Silver

7   nos. - Axle 2 Notched (#32062), Red
10 nos. - Axle 2 Notched (#32062), Black

8 nos. - Connector Peg with Friction 2M(#2780), Black
4 nos. - Connector Peg with Friction 3M (#6558), Black

4 nos. - Pin Long without Friction Ridges Lengthwise (#32556), Black
2 nos. - Axle Connector with Axle Hole (#32039), Light Gray
2 nos. - Axle Connector with Axle Hole (#32039), Red

2 nos. - Connector Peg/Cross Axle (#6562), Light Gray
2 nos. - Connector Peg/Cross Axle (#6562), Tan

2 nos. - Axle and Pin Connector Perpendicular(#6536), Black
2 nos. - Axle and Pin Connector Perpendicular(#6536), Tan

2 nos. - Axle and Pin Connector Perpendicular Double (#32291), Red

6 nos. - Axle and Pin Connector Perpendicular 3L with Center Pin Hole (#32184), Red

2 nos. - Axle and Pin Connector Angled #3 - 157.5 degrees (#32016), Tan
2 nos. - Axle and Pin Connector Angled #5 - 112.5 degrees (#32015), Tan
2 nos. - Axle and Pin Connector Angled #1 (#32103), Light Gray
2 nos. - Axle and Pin Connector Angled #2 - 180 degrees (#32034), Red

2 nos. - Liftarm 1 x 4 Thin (#32449), Red
4 nos. - Liftarm 1 x 3 Thin (#6632), Red
4 nos. - Liftarm 1 x 3 Thin (#6632), Tan

4 nos. Bush for Cross Axle(#6590), Light Gray
4 nos. - Bush 1/2 Smooth (#32123), Light Gray

2 nos. - Cross Axle 8M (#3707), Black
2 nos. - Cross Axle 6M (#3706), Black
1 no.  -  Cross Axle 5M (#32073), Black

CDs and Hubs
2 nos - CD disks (old, new, etc. that does not matter, up to you)
2 nos. - Hubs (I got these hubs from Electric Dragster Kit by Middlesex University.)
Note: You could do something similar to this  "Mousetrap Powered Car" project by dustynrobots

IR distance sensor (Sharp - GP2Y0A21YK0F)
I got this Sharp distance sensor from Adafruit (Product ID 164) 

Palm Arduino Plus

Palm Arduino Plus is Arduino compatible board that included motors controller IC (L293D) on the PCB. And Palm Arduino Plus is designed to be used with LEGO® components.
See details of Palm Arduino Plus.

Wireless Radios
There are three options of wireless radio modules to be used, since Palm Arduino Plus has those ports available,
  • XBee module,
  • RN-XV WiFly module,
  • Bluetooth module.

 

Tools
X-acto Knife
Super Glue
When I saw this I was like " holy snap yeah!" You did an awesome job, thanks man.
this is a nice robot, good job.
Thanks.

About This Instructable

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Bio: I am Electronic Visualization Artist. I look at things through the Looking Glasses.
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