Help me make a buzzer system for my classroom.
I am a Philadelphia public school teacher and I would like to make some type of "ring in" or buzzer system so small groups of students can compete in review games. Ive been trying to do some research with LED's and simple circuits but I dont have the know how to make sense of it all. I am certain that someone on this site does. If you could help me out or point me in the right direction my students and I would greatly appreciate it.