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Tachometer Generator Wiring
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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Sep 29, 2011 6:46 pm Post subject: Tachometer Generator Wiring

At 11:01 AM 9/29/2011, you wrote:

 	  Quote: 	
		  



To Bob and All,

At my age, I know it is only a matter of time before I forget to 

latch the canopy before takeoff on a hot sunny day.My plan is to use 

a PIC12F509 microprocessor that will monitor the limit switch and 

also count the engine RPM.


	


   Is this a Dynon sensor? Call the factory and see

   what the characteristics of this signal are. It

   may already be a 5 or 12v square wave. If so,

   you can tie it to a PIC input through a suitable

   series resistor, a capacitor and perhaps a clamp diode.



   Use one of edge sensitive inputs. But the first

   question to answer is what does the signal look

   like? If you can run the engine now, the a 'scope

   would get you this information too.



   I have a little "do everything" board and enclosure

   that might be suited to your task. See:



http://aeroelectric.com/Pictures/Schematics/Do-Much_Board.pdf



http://www.aeroelectric.com/Catalog/AEC/9011/A15_Package.jpg



   Depending on what parts are installed on the board, what

   parts are left off, and what code goes into the

   8-pin PIC, you can do a whole lot of neat things.





   Bob . . .

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mrspudandcompany(at)veriz
Guest

Posted: Fri Sep 30, 2011 3:55 am Post subject: Tachometer Generator Wiring

I have a little "do everything" board and enclosure

   that might be suited to your task. See:



http://aeroelectric.com/Pictures/Schematics/Do-Much_Board.pdf



http://www.aeroelectric.com/Catalog/AEC/9011/A15_Package.jpg



   Depending on what parts are installed on the board, what

   parts are left off, and what code goes into the

   8-pin PIC, you can do a whole lot of neat things.



   Bob . . . 



		I noticed that this was just posted yesterday on your

website.  Is there any documentation available?  What things do you

anticipate it to be used for?



		Roger

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Sep 30, 2011 6:10 am Post subject: Tachometer Generator Wiring

 	  Quote: 	
		  

                 I noticed that this was just posted yesterday on your

website.  Is there any documentation available?  What things do you

anticipate it to be used for?


	


    It's the core board for about a dozen different

    products with the notion of having 90% common bill

    of materials and differing only by what software

    is installed. AEC9011 is but one example.

 	  Quote: 	
		                   Roger




	




   Bob . . .

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user9253

Joined: 28 Mar 2008
Posts: 1938
Location: Riley TWP Michigan

Posted: Fri Sep 30, 2011 8:35 am Post subject: Re: Tachometer Generator Wiring

Thanks for the response Bob N.

This is an RV-12.  The RPM sensor is part of the Rotax 912 engine.  The tach trigger coil sends a small AC voltage signal to the tach once every revolution of the crankshaft, according to page 8 of this document: http://flymall.org/aircraft/docs/FAQs-on-Rotax.pdf

I do not have a portable scope.  But my Fluke meter shows an AC voltage.

Does your "do everything" board come with ASM code for the various functions or do we have to write our own?

Thanks, Joe

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_________________
Joe Gores

nuckolls.bob(at)aeroelect
Guest

Posted: Sat Oct 01, 2011 9:16 pm Post subject: Tachometer Generator Wiring

At 11:35 AM 9/30/2011, you wrote:

 	  Quote: 	
		  



Thanks for the response Bob N.

This is an RV-12.  The RPM sensor is part of the Rotax 912 

engine.  The tach trigger coil sends a small AC voltage signal to 

the tach once every revolution of the crankshaft, according to page 

8 of this document: http://flymall.org/aircraft/docs/FAQs-on-Rotax.pdf

I do not have a portable scope.  But my Fluke meter shows an AC voltage.


	


    Hmmmm . . . once per revolution makes for a challenging

    tachometer design. We still need to know if the transducer

    is a hall effect device or a inductive pickup. In any case,

    the output is a very low duty cycle pulse. At 5500 cruise

    you'll have 91 Hz tach signals the drop to about 1/5th that

    for idle or 18 Hz. It would be very helpful to know the

    style of transducer along with the amplitude and duration

    of output pulse.



 	  Quote: 	
		  Does your "do everything" board come with ASM code for the various 

functions or do we have to write our own?


	


    You gotta do your own code and your own components

    selection tailored to the task. Not all components

    shown in the schematic are installed together for

    a single project. But with the layout shown, values

    of parts put in and parts left off offer a huge combination

    of options for inputs, outputs and tasks.





        Bob . . .

                    ////

                   (o o)

    ===========o00o=(_)=o00o=========

    < Go ahead, make my day . . .   >

    < show me where I'm wrong.      >

    =================================

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