I have a project that I am working on that has three on/off switches and I would like to read them all on one pin. (basically I have about 4 pins left so I am trying to be conservative.
I was wondering if there was a way to use a resistor on each switch, and then be able to measure that to see what combination they are either on or off... note that I need to read them in a way that multiple switches might be on at the same time.
I would like to do it without chips, Ic's etc.., (keep it simple)
I am having some trouble getting my head around the schmatics. Any ideas?