Quote:
Originally Posted by vhcook
You had to trigger the solenoid before the buzzer. Any after-buzzer activity was just the air pressure equalizing on a decision that had already been made.
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Not strictly true. You can have a single acting solenoid valve which spends the entire match energized, keeping your ball ejector retracted. As soon as the robot transitions to the disabled state (either commanded by the field at the end of a match, or because the robot lost communication) that solenoid will cease to be energized, and extend your ball ejector.
The trick is in figuring out a way to either A) make it so that during the pre-match disabled phase you can keep your ejector retracted (perhaps you use a dump valve connected to a servo to trap air strategically in the system that can later be released) OR B) pick the ball up at the start of auto instead of pre-loading it into your robot.