Monthly Archives: July 2012

High Volume Pneumatic Compressor    Send article as PDF   
Here are the Instructions to build a LEGO Technic, High Volume Pneumatic Compressor. The Compressor uses 2x Large Pneumatic Pumps to fill the Air tank. A large Pneumatic Cylinder is used to drive a Pole Reversing Switch which turns the Compressor off when the system is fully pressurized.

LEGO Mindstorms NXT X-Y Plotter    Send article as PDF   
I’ve have built my first LEGO Mindstorms NXT Plotter (printer) which is programmed with RobotC. The plotter draws pictures by drawing whole lines, known as vectors. An X–Y plotter is a plotter that operates in two axes of motion (“X” and “Y”) in order to draw continuous vector graphics. The term was used to differentiate it from standard plotters which had control only of the “y” axis, the “x” axis being continuously fed to provide a plot of some variable with time.

RobotC: Autonomous Holonomic Platform using 4x Sonars    Send article as PDF   
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.

RobotC: Using Multiple Ultrasonic (Sonar) Sensors    Send article as PDF   
When using Multiple Ultrasonic (Sonar) Sensors together, you need to configure the Sensors to use ‘Single Shot Mode’, so only ONE Sensor is taking a measurement at any time. If you have all the Ultrasonic Sensors on at once they interfere with each other and give incorrect readings. To get around these issues, you need to take advantage of the LEGO Sonar Sensor’s Mode 1: Single Shot Mode.

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