My project is a library for E32 LoRa (Long Range) device very cheap and long range (from 3Km to 8Km), to simplify usage and conf.
Project tutorial by Renzo Mischianti
Connect up to 10 buttons using a single interrupt.
Project tutorial by Svizel_pritula
Unlock an inconspicuous chest from across the room with a secret switch!
Project showcase by Michael Guerero
Very cool throw back idea.
Would you mind posting a link to the solenoid?
I was looking for ideas like yours to scare off deers.
I have the same concern about lasers, but I wonder if you researched the LED you use.
The first page in the data sheet says:
Depending on the mode of operation, these devices emit highly concentrated non visible infrared light which
can be hazardous to the human eye. Products which incorporate these devices have to follow the safety
precautions given in IEC 60825-1 and IEC 62471.
The first document is convoluted, but describes requirements for labels.
The second document seems to say it can cook your retina.
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