...
The above would cost $185 total, with $106 of that being the XBee which could be swapped with a much cheaper transmitter.
If we need deployments those could be handled by relays on separate batteries.
We also may want some kind of nonvolatile storage.
Just an idea if we don't have the resources to make custom PCBs. The above could also go on a perf board.If we need deployments those could be handled by relays on separate batteries.