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These guys build custom PCB circuit boards. They have free circuit design software. They are located in WA. Just in case we wanted to design and build our own circuit boards.

PCB connector system to go from PCB board to a wiring plug.

A pcb circuit board manufacture. They recommend using the Eagle free PCB design software to design the boards.

Good article on hall effect switches and latches that can be soldered on pcb boards and used to detect the presence of a magnetic field and converting that to a digital signal.

I like the latching. Was one of the issues we had with the elevator and the hall effect sensors. We had to wait a certain amount of time so that it would not recognize the same magnet more than once. The latching would have make it work exactly how we wanted it to. We might want to see if we can get a catalog or something for sourcing some of these electronics.

Here is the download page for the Eagle PCB design tool. It look pretty good and I found some video's on how to use the software to create our own boards.

One of Three videos showing how to design a printed circuit board and to create the files needed to have the board built. Price to get a custom board are pretty reasonable. between 5.00 and 50.00.