i2c Relay Expander Uses Nifty Card-Edge Connection

[Andrew Sowa] wanted to use an off-the-shelf relay board from Numato Labs. The board lacks a suitable computer interface, which meant that [Andrew] would have to build one, and its input connectors are screw terminals, which meant a lot of wiring. Undeterred, he created an i2c expansion board using an MCP23017 I/O port expander, and with a novel card-edge designed to mate with the screw terminals, solving both problems at once.
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CNC milled docking system for Droid

[Steve] wanted a dock for his Droid phone but couldn’t bear to put cheap-looking parts in his nice BMW. He decided to build his own in order to satisfy his functional and stylistic needs. His main goal was to have a dock with no wires showing, but it also needed to be removable and have the ability to work with different devices (GPS, Droid, etc.).

The hardest part of a build like this is matching the bracket system to the car’s interior. [Steve] sidestepped the problem by starting with a commercial mounting bracket made specifically for the BMW E90 series. From there he added the female half of a mounting bracket he milled himself. The male half connects to this part using an edge connector, passing signals and power between the car and whichever device is currently installed. This way he can design brackets for different devices and not change what’s in the car.

To get a closer look, check out the video after the break. The system he came up with looks wonderful and works great.

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