[Alan Anderson]

You must use at least one Analog In and one Digital I/O module. If you want to read more than seven analog values, you need a second Analog module. If you want more PWM outputs or more digital I/O than the Digital Sidecar provides, you need a second Digital module. If you want to control pneumatic solenoid valves directly (not through a Spike relay), you need a Solenoid (Digital output driver) module, and you might need two if you have enough pneumatics.

But for most teams, a single Analog In and a single Digital I/O is enough.


The same three module types (and only those module types) work in the new smaller FRC cRIO chassis. Buying only a bare chassis will be fine for what you want to do. But if you can manage to scrape up the money to buy the full cRIO kit as well, I don't think you'll regret having another cRIO available.