[kevin.li.rit]

Originally Posted by funstuff

(Seconding Coffeeism)

The single solenoid requires a constant signal for the piston to stay extended, where as the double would have IN/OUT logic - trigger the solenoid, it goes out and stays out, trigger again and it goes in and stays in. It would require another Spike relay (one for the in and one for the out), but may alleviate the issue of constant (albeit small) current to the solenoid.

Using the double action solenoid as a single solenoid with a spike is possible with only one spike. One positive end would be on the M+ and the other would be on M-. Ground can be connected to the PD board. Driving M+ would flip the solenoid valve one direction, driving M- would flip it over the other direction.

See the spike user guide for this illustration