Here is a project that you could make in no time that will make your trick-or-treat hosting a lot spookier.
You will set up a laser beam in front of your door, which when broken by trick-or-treaters will trigger spooky sound effects of your choice.
This project revolves around a laser module and the cheap and simple MP3 player module DFPlayer Mini, which is widely available.
You'll also need a computer with an SD card reader for adding sound(s) to the SD card.
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