Monthly Archives: December 2011

Li-Po Batteries & LEGO Mindstorm NXT    Send article as PDF   
Both the LEGO 7.4 Volt Rechargeable Batteries for Mindstorms NXT (Part #x1678 & #bb495), are of Lithium-ion Polymer construction. Lithium-ion polymer batteries, polymer lithium ion, or more commonly lithium polymer batteries (abbreviated Li-poly, Li-Pol, LiPo, LIP, PLI or LiP) are rechargeable batteries (secondary cell batteries). Normally batteries are composed of several identical secondary cells in parallel addition to increase the discharge current capability.

LEGO PF to NXT Adapter Cable    Send article as PDF   
I really despise the NXT Motor design. The shape of the motor was basically just designed to allow construction of the LEGO Mindstorms NXT Kit’s, AlphaOne‘ Robot easy. As a result, it makes it hard to use the NXT Motors in a lot of situations without extra bulk being added to your design. Often I just ditch the NXT Motor in preference for a LEGO Power Functions Motor. The downside to this approach is you have no feedback from the Power Functions Motors, unlike the NXT Motors with their Quadrature Rotary Encoders. You can use a LEGO Mindstorms RCX Rotation Sensor for a lot of applications.

ExoForce Wheeled Rover Prototype    Send article as PDF   
This is my ExoForce Rover Wheeled Prototype Chassis. Using the Exoforce Wheel Mounts discussed in my previous post, I now have the basic chassis set-up. The Chassis allows both the front and rear wheels to be driven. Also both front and rear axles steer in order to help to decrease the robots turning circle.

Mars Rotacaster Rover – ‘Mark II’    Send article as PDF   
Lookout NASA, you have Rover competition. And it uses the amazing Rotacasters for unsurpassed maneuverability in confined spaces. The Mars Rotacaster Rover is based on the current NASA Mars Rovers with their unique suspension set-up.

I’m the Winner of a Dexter dIMU Sensor    Send article as PDF   
The Guy NXT door, (Aswin Bouwmeester) had a competition where you could win a LEGO® Mindstorms NXT dIMU sensor from Dexter Industries. It is the same sensor sent to Aswin for evaluation purposes, from Dexter Industries. Aswin recieved it for free for testing, and is probably is the best tested sensor available.

Modifing ExoForce Wheels for Mindstorms    Send article as PDF   
Using LEGO® ExoForce Devastator Wheels (160mm D. x 28mm) to go Off-road with your LEGO® Mindstorms NXT Robots is a great idea, but as they are, they are pretty useless for a robot. This is due to the mount arrangement of the wheels hub mounting points. As mentioned in my previous post, ‘Using ExoForce Devastator Wheels’. I came up with a reliable method of connecting the wheels to your robot’s chassis. This in mind, I decided to go one step further….

Using ExoForce Devastator Wheels    Send article as PDF   
Using LEGO ExoForce Devastator Wheels (160mm D. x 28mm) to go Off-road with your LEGO NXT Robots is a great idea. But, the biggest problem is creating a solid attachment to you Robot. 

A Simple LEGO Mindstorms NXT Trike Base    Send article as PDF   
I needed a simple Trike type LEGO Mindstorms NXT Vehicle Base, that had to meet the following criteria:
  • Quick and Easy to build
  • Easy access to the Recharge socket on the NXT Li-Po Battery
  • Easy access to the NXT’s Sensor Ports and Motor Ports
  • Easy access to mount various type of sensors
  • Rotate as close as possible to the Robots own footprint

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