Krill Labs - Video Selector

About:
Because I have so many robots and turrets mounted with cameras around the house and only one or two video cards on the
computers, I needed a video selector. And it wasn't enough to just get one from the local department store, I needed one
that could also be controlled from a computer for remote administration. I'm always logging into my computers remotely
because I travel so much, so I needed a way to select which camera the computer is viewing with out actually being there.

Circuit Design/Assembly:
I ended up optimizing the initial design for maximized cost efficiency. The unit can controll 2 seperate channels, each
having 4 inputs, and it only uses 3 relays on each channel for mechanical signal selection. There are two buttons for local
control. One to switch between Channel A or B, and the the other to rotate through the inputs. In the processor's firmware,
I've included serial commands to either select exactly which input should be sent to the output, or to rotate through the
inputs sent to the output.
For the assembly I was able to mount it into an enclosure already in use by me. The base station for my robot, Peabody, had
some extra space in it, a power supply, and a connection already leading back to the computer's serial port, so I just
mounted it in there. The base station is also used to interface with my Sentinel Camera, Kitt, and the front door camera.
So this enclosure is basically an all in one package.

Prototyping:
Here are the schematics and first revision of the video selector's mainboard.

Assembly

This relay is actually one of the most important components in this project. It is not an ordinary DPDT relay, this
is a Dual Coil Latching relay. It will stay in either posision with just a quick pulse on either of it's coils.
This allows the video selector to maintain it's last position even when it's not powered up.

Here is the final circuit all soldered up.

This is the base station I used to enclose the Video Selector.

	NAME:	REMARK: