Quote:
Originally Posted by ebarker
There are the double and single solenoid types, very economical. Can someone explain the advantage of double versus single solenoid.
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They both perform the same actions as far as extending/retracting a cylinder.
The difference is that a single solenoid has a home position that it always returns to when the robot is Disabled, while the double solenoid always remains in the last position it was set to.
A single solenoid is preferred when you have a mechanism that must always be stowed in a home position, or a mechanism that you want to activate at the very end of a match no matter what. It can be a little less safe, because the mechanism will activate whenever the robot is Disabled.
An example from last season might be a low bar hanger that would retract automatically when the match ended giving you 10 pts as long as the robot was in position.
A double solenoid is a good choice when you want a mechanism to remain in the last position you chose. Especially when there is no particular home position, like a gripper. It's a little safer because the mechanism doesn't suddenly move whenever the robot is disabled.