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The SV can drive up to six RockRack switches directly. For more than that, the buffer circuit I drew should work, for up to 20 or so switches. Vern

Hi Steve, I sent you an email. Also, Dynon's advice on this is correct, just hook it up with paralleled serial outputs. Cheers, Vern

In defense of Dynon, they cannot design everyone's electrical system for them.  That's why avionics shops and people like me exist. However, your application is common enough to be addressed.  The Dynon dimmer outputs may not be able to drive the load you want.  You will want a buffer between...

I've already gotton feedback on the design from another pilot who wants an Arduino controller for his yacht (too many toys!) that does all the same stuff, but at a slower speed. He needs one more analog input, so I am putting a jumper option on the PCB to allow for this, to get a total of six...

Sorry Folks, I found a bug in the Arduino PWM circuit that forced a documentation change on my part. Best to use the link here to get the most recent version: http://vx-aviation.com/documents/ Thanks, Vern

Thanks. The documentation is actually the most important and time consuming part of the project. A lesson I have tried to teach to many, but with limited success! Vern

Arduino-compatible aviation controller. Here’s a sneak preview of my new Arduino-compatible motion controller.  It was developed as an auto-trim controller for the Dynon SkyView system, before Dynon released their own.  This version has been flying for more than three years, with a earlier...

Aha! I used a GP input for my timing advance meter, but I've always been suspicious of the measurement because it was sensitive to ground potential differences. Using the TC input to make a differential measurement should eliminate this error. I guess the result will be displayed in degrees...

It's very important to ensure that your plugs are all in good condition and have identical gaps. Any problems with the plugs, wires or mags will cause erratic readings. The P-TACH device helps to stabilize tach signals, but won't fix misfire problems in the ignition system. I tried misgapping...

The problem you faced and the solution is very common in audio systems. Ever wonder why stereo systems have grounding lugs in the back? That was for connecting all of the equipment chassis together to reduce noise and interference. There are a lot of lessons to be learned in this thread, but...

I don't think that overdriving the EMS inputs is good design practice. I use isolation diodes with the anodes connected to the EMS, like shown in the link. http://www.vx-aviation.com/sprocket/photos/panel_elec/schematics/EMS.pdf Vern

Here's a proposal:  A circuit like this should work without significantly affecting measurement accuracy.  It's important to have a low impedance ground for the clamp diodes (short connection to main system ground). The resistors prevent unwanted failure of the clamp diodes.  The clamp diodes...

I'd check your pitch servo shear screw. Vern

Would a pair of matched resistors, say 5K0 in series with the shunt sense points provide adequate protection? If so, they could replace the fuses or fusible links currently used. I know that they would change the gain of the current sense diff amp, but this could be adjusted in software or...

??? The SV fuel calibration is only good for one aircraft attitude. For example, calibrating a tail dragger in 3-point attitude will give accurate indications on the ground, not so much in flight. Conversely, calibrating a tail dragger in level attitude by jacking the tail will give more...

I have airspace warnings on my Garmin GPS and they are useless. In complex airspace (southwestern B.C.) you get constant warnings and a change in heading will give more warnings. It takes at least 16 frequency changes on a 20 minute flight from Victoria to Vancouver through terminal airspace...

That's your problem. The Ray-Allen switch needs a pair of isolation diodes to work in this environment. See http://www.rayallencompany.com/RACmedia/instructionsRS2withmods.pdf Vern

Murray, I get an error (even with antivirus off) "Application cannot be started. Contact the application vendor." Any tips? UPDATE: Managed to run in Vista rather than 7, but screens seem corrupted. Thanks, Vern

Related, but a bit off thread: You provide fuel flow in tenths of gallons, but only in integer liters. This provides less precision in leaning or balancing injectors. Please allow fuel flow precision displayed in tenths of liters, even if the resolution is only 0.2. Vern

Can't even sneeze around Vancouver/Victoria without being in US class C. Last year, I had to get a letter from the FAA just to depart Victoria! Even our VRF checkpoints are in US airspace. Murray, check your PMs about your EMS editor. Vern