Some answers here:https://www.instructables.com/answers/How_do_you_keep_deer_out_of_your_garden_without_a_/
Select as Best AnswerUndo Best Answer
A rail gun?
Try motion sensor lighting or a motion sensor that activate a sprinkler system or maybe a buzzer or other noisemaker.
Im sure someone makes somthing like that but I bet it's pricey!
Some motion sensors act as a switch between the power source and whatever device it wil activate.
Most out door stuff (small lights, sprinkler timers) are 12V but some are 120V.
You may be able to match up some pieces at the local hardware store.