Controlling 2 pneumatic valves w/ 1 spike
 

Is using two pneumatic valves on one spike legal? How should I connect them?

Re: Controlling 2 pneumatic valves w/ 1 spike
 

yes it is legal.

as for connecting them just attach the 2 positive wires to the same spot on the spike and do the same with the negatives.

Re: Controlling 2 pneumatic valves w/ 1 spike
 

... actually, you'd need to put +12v and GND on the input side of the spike from your power distribution board, then, on the output side of the spike, you wire up the RED wire from the first solenoid to M+, the RED wire from the other solenoid to M-, and take both of the blacks from both solenoids back to ground.

Drive the spike "forward" and you get one solenoid active, drive it "backward" and you get the other solenoid active.

Re: Controlling 2 pneumatic valves w/ 1 spike
 

Also, you don't technically need to use a spike to control a pneumatic valve. You could just rig up the relay bumper on the cRIO. I'm pretty sure its legal to hook up two solenoids to one connection on the relay bumper, but I'm not positive, so as our team says, RTFM. (Read the FIRST manual)

(And yes, the F in RTFM didn't always stand for FIRST)

Re: Controlling 2 pneumatic valves w/ 1 spike
 

Xela,
What you are asking is legal but not always desirable. I would suggest you check out the Spike manual on the IFI website http://www.ifirobotics.com/spike.shtml. There is some application notes in the manual that you might find useful.