Hi im new to this forum and i really need some help. My professor gave us a project to make a scoreboard. The materials to be uses are lm555,74ls90 and decoder ic. Im stuck on the first step because our professor didnt explain clearly. I just know that we need 4 buttons for 1 point 2 points and 3 points. I really need some help and if you can provide a schematic, it will be greatly appreciated. Thank you!