I want to use a piezo acceleration sensor and send that signal via LoRa upwards of 400m and activate a 12V LED Strobe. Any help is greatly appreciated. I assume I need 2 MKR 1310 with Dipole antennae, 1 3 axis accelerometer, but what else? I'm brand new to this
Any Arduino and any consumer grade accelerometer can be used to collect and send accelerometer data via LoRa radio modules.
The choice hardly matters, unless you have some specific requirements that you forgot to mention.
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As always, the key is to break this down into its separate parts.
Why specifically a piezo sensor?
Just LoRa, or LoRaWAN ?
Whichever, the fact that your data comes from an accelerometer is irrelevant to this part - as far as transmission goes, it's all just data.
Again, this is independent of the source of the data.
You don't need them. They should meet your requirements - but they are by no means the only option.
Some options have built-in antennas: they might well achieve 400m...
The LED "strobe"?
This seems to cover most of your description:
https://docs.arduino.cc/tutorials/mkr-wan-1300/lora-button-press
Do you really mean you need to use a piezo accelerometer?
Piezo accelerometers have a sensitivity measured in pC/g or pC/(m/s²).
They give outputs of a few pico coulombs, and you need to use a charge amplifier to convert the piezo accelerometer output to a voltage suitable for measuring by an arduino.
Other more suitable accelerometers are available.
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