Tag Archives: platform

Mindstorms EV3 Dual-Wheeled Holonomic Platform

Technicolour Holonomic Platform
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I have been working on an LEGO Mindstorms EV3 Holonomic Platform, with Dual-Wheels on each of its three sides. It is controlled via a Sony PlayStation Wireless Remote Control. The PS2 Remote interfaces to the LEGO Mindstorms EV3 Brick via Mindsensors PSP-Nx-v4 Adapter.

EVShield Holonomic Platform with LCD & Wii Nun-chuck

EVShield
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A few days ago I received an EVShield from OpenElectrons (Mindsensors) to Beta test. The EVShield fits on top of an Arduino Microcontroller and operates in a similar manor to the LEGO Mindstorms EV3 Programmable Brick. The EVShield allows you to connect the full range of LEGO Mindstorms EV3 & NXT, Sensors and Motors to an Arduino Uno Board.

NXShield: Arduino Powered LEGO Holonomic Platform

NXShield-Holonomic-Platform
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I have just developed a LEGO Mindstorms Holonomic Platform Robot powered by an OpenElectrons NXShield for the Arduino Mega.

I have just had 4 day up at Burnie on Tasmania’s North-west coast at the “Brixhibition Burnie” with my Robots. Among the robots I took was a OpenElectrons NXShield Powered Holonomic Platform which survived the abuse from the general public who where controlling it for some 18hrs, without it missing a beat.

Holonomic Platform for 125mm Rotacaster Omniwheels

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I’ve been working on a very solid, Holonomic Platform to be used with the large 125mm Rotacaster Omniwheels as part of my display for the TAZ-Brick Collector Club’s Brixhibition to be held on the weekend of 20-21 April 2013.

RobotC: Autonomous Holonomic Platform using 4x Sonars

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This Autonomous Tri-Drive Holonomic Platform is fitted with [rotacaster] and uses 4x Ultrasonic Sensors for navigation. The RobotC Code is based on my previous post on using multiple Sonar Sensors in RobotC. The main challenge is to use all 4 Ultrasonic Sensors without them interfering with each other, resulting in non-valid measurement readings for distance values to obstacles.

PS2 Controlled Holonomic Platform Using RobotC

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Yes, another Holonomic Platform. My son, Anthony requested a Holonomic robot to take to school for show-and-tell. So here it is with a few scholarly extras, including the [robotc] code.
A Holonomic platform is one of the many types of Holonomic drive trains — it can move forward and backward as well as left or right without turning. The Holonomic platform can move in any direction instantaneously unlike conventional four wheeled vehicles.

NXT Quad Drive Holomonic Platform

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I’ve been working on a new LEGO Mindstorms NXT Dual Drive, Quad Holomonic Platform. This Robot uses dual Rotacasters on each of the four axis’s. The Robot also uses four NXT Ultrasonic Sensor between each of the four axis’s. The four Ultrasonic Sensor work in ‘MODE 3: Event Capture Mode’. The Ultrasonic Sensor are cycled through one-at-a-time, to avoid interference between each of the sensors.

Build a Solid LEGO NXT Killough Platform

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Building a solid and reliable Killough Type Platform is not easy using the standard LEGO Technic Parts List. For the last 12 plus months, I have been refining my designs which use the standard NXT Motors. Due to the NXT Motors shape, keeping the Robot’s overall footprint as small as possible has been difficult.

Line Following Killough Platform

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This Rotacaster equipped Killough Platform Line Following Robot uses a set of 3x Rotacasters with the new Black Hub-centres and S45A Hardness type rollers. The S45A’s roller colour is a perfect match for Lego’s “Dark Bluish Gray” colour scheme. I’m excited about testing the new wheels using softer durometer materials on the rollers. The S45A provides better traction, which is especially good for lighter robots.

Controlling a Holonomic Platform

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The easiest way to control a Holonomic Platform type Omni-wheeled Robot is with an an Analogue Joystick, such as the Sony PlayStation PS2 Controller. Mindsensors produce the PSP-Nx-v3: Sony PlayStation2 Controller Interface for use with the Lego Mindstorms NXT. You can used any PS2 compatible Remote Control/Joystick Controller with the PSP-Nx-v3.

Solid Holonomic Platform Joiner @120 Degrees

120 Degree Joiner
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The Omnidirectional Holonomic Platform more commonly known as the Killough Platform was invented by Stephen Killough and Francois Pin at the Oak Ridge National Laboratories. It uses three specially designed wheel assemblies that can provide force along only one axis (with the rotation of the axle) and can move freely along the direction of the axle. A very detail explanation on Holonomic Platforms can be viewed at TechnicBRICKs blog.

Whilst developing my Omni-Bot I cam up with an extremely Solid Tri-arm Joiner arrangement. Each Arm is separated by 120 Degrees which makes it a great starting point for any 3 Armed project.



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