The control signal need very little current, there is a 1k series resistor on the cortex so probably less than 1mA, you should be able to drive it from most micro controllers. The solenoid itself needs about 100mA @ 5V. See the first two posts in this thread for details on how the cortex drives the solenoid.
Thanks for the help. I really appreciate it. I’m sorry it took me a few days to say so.
I figured that they probably didn’t need very much current, but I just wanted to make sure. Now I need to add a 500mA 5V power supply for the solenoids. The 5V supply on the I/O board can only supply 80 - 100mA max. It was just meant to power a few LEDs, sensors, and a piezo speaker.