I would like to build some sort of notification device that I could set up on my front porch to alert me when the porcupine that has been chewing on my house is outside on the porch. If anyone has any ideas I am open to them. I figured a couple of small LED transmitters and receivers that could run on batteries would be best, if they can be wired up to ring a buzzer or illuminate a bulb to let me know it is out there. I would need 2 separate entry paths covered for full coverage of the porches perimeter. Does anyone have any schematics kicking around that will accomplish this? This porcupine has already chewed the ends off of 2 logs in my log cabin and I really need to catch him in the act. Any help will be most appreciated.