NPN & PNP NO NC Proximity Switches - experiments with function and Pull Down Resistors

In a previous video I did some experiments with and NPN NO Switch used as limit switch for my Stainless OX CNC. Later I realized that four different types exist: NPN and PNP both in a NO (normally open) and NC (normally closed) version. In this video I experiment with the four switches to see how the work and find some resistor combinations that will work as pull down to give a signal of approx. 5V that fit most Break out Boards. FOR use as limit switch I would recommend to use one of the NO switches. I do not think it matters what you choose NPN or PNP as the signal direction can be set in the software (e.g. Mach3). Switches and other CNC parts can be found on: makersupplies.dk