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I'm building a gear indicator and information display for my CBR500R. It uses an Arduino Pro Mini, Nokia 5110 display, and hooks in to the Honda diagnostic connector under the seat. Protocol is a custom OBD k-line format. Here is some useful information on the protocol used.

The first version I created used 2N7000 MOSFET's for the serial interface and it worked fine on a breadboard. However, before I could build the final physical version...

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This is a small 25mm by 30mm MultiWii board I started designing a while ago. I haven't had much time to refine or test it. I did create a prototype board but that's about it. The intent was to create a board small enough to be used on micro quads, helicopters, and planes.

I'm providing the KiCad schematic and board layout here.

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The radio doesn't sit flat on the bottom when you set it down on a level surface.

External TX module pins must be bent to fit modules.

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Project 130X.

Had a Rakon DFC CNC head that was not square from the factory so I pounded on it with a hammer to make it straight. 

It appears to be possible to use an S107 tail motor to repair/replace the 130x servo motor.  The S107 motor is 4mm and the servo motor is normally 5mm so there is some extra space.  I used a piece of 1.5mm carbon rod to take up the extra space and it seems to work fine.  I may try to find some other method of holding the motor in place.  Also...

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Bought a cheap mCPX off eBay that had a broken 3-in-1.  Fixed the 3-in-1 and converted to brushless using C05XL and super-FET XP-3A (double FET's).

Main motor PWM signal (from resistor on back of board) is 1kHz.  On the 9x using OrangeRX TX module throttle ranges from -72% (completely off) to +72% (solid full throttle signal).