I am using the IRremote library which limits the amount of IR receivers I can have hooked up (with modifications, it can handle 2 max I have read). So that's why I am planning to use a pro micro or nano for each target. I was thinking I could have the target Arduinos handle the prop triggering too (since it would be near the motor/valve/etc), but the only issue with that is sound. It would be cost prohibitive to buy a sound board for each target.
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