Servo - August 2008

switch that can be used to turn on and off the robot safely, quickly, and easily.

During the mad dash of event preparation, builders often neglect this critical component. I have seen dozens of fights lost due to a power switched being tripped during a hard hit, links falling out because of poor design and placement, and even fights lost simply because of not turning the switch to the full on position.

Given the importance of this component, it should be factored into your robot’s design previous to the final hours of your build. Power switches can be made very simple or complex; what you decide to go with will depend mainly on available space and budget.

It is my opinion that the two best options for a power switch are a removable power link which any builder should be able to easily make, or the Team Whyachi ready — made power switch line.

A removable power link is easily made by creating an open on the negative side of your main power line which can be closed by inserting the plug, thus completing the circuit and turning the robot on. Turning the robot off is as simple as yanking the plug out which puts the open back onto the line. The link can be

PHOTO 1. A Team Whyachi power switch. Simply insert the wrench and turn on or off.

made of whatever you want. I find, however, it’s easiest to use a set of Deans Ultra Plugs.

I simply wire the female end into the power and use the male end as the plug; that’s it. This switch should cost you less than $5.

The other option is to buy a ready-made switch from Team Whyachi. They are made very solidly featuring a UHMW body with copper contacts inside which you are able to make and break contact with by adjusting an internal screw. Loosening the screw turns the robot on while tightening breaks the copper contact and shuts the power off. They also come in a variety of sizes to fit your needs. If you have the budget for this item, then it may be a sound investment of about $50.

No matter what power switch option you decide to go with, the

most important thing is to put some forethought into it.

Be sure to consider its placement so you have easy access to it and so it is protected from your opponents. Remember that one shot to this part can take you out of the match, so treat it well. SV

PHOTO 2. A removable link made from Deans Ultra connectors. A simple, easy, and cheap solution to your power switch needs.

ROBOT PR FILE

TOP RANKED ROBOT THIS MONTH

● by Kevin Berry

Touro has competed in RoboGames 2006, RoboGames 2007, and 7 ENECA-Recife. Touro debuted in RoboGames 2006 achieving third place. Afterwards, it won Brazil’s III Winter Challenge and VI Robocore ENECA – both in 2006. In 2007, Touro won a RoboGames gold medal and kept both Brazilian competition titles.