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Dynon Pitot Heat Warning with MGL EFIS

 
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art(at)zemon.name
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PostPosted: Mon Mar 12, 2018 4:06 am    Post subject: Dynon Pitot Heat Warning with MGL EFIS Reply with quote

Folks,
I am installing a Dynon heated pitot tube. The controller has a pin which gets grounded if the heater is turned on and fails. This is supposed to drive a warning lamp. See "pitot heat warn" on the attached diagram. 
I want to replace the pitot heat warn lamp with an indicator on my MGL EFIS. The EFIS has eight analog inputs (see A1 through A8 on page 6 of the attached iBOX V1 installation manual) and also has four balanced analog inputs (see 1+,1- through 4+,4-) on page 7.
This would be easy for me if INST-4-G from the Dynon controller was either grounded or at some positive voltage. But if I understand correctly, that wire is either grounded or open. How do I hook this to my EFIS?
Thanks, 
    -- Art Z. 

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user9253



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PostPosted: Mon Mar 12, 2018 4:59 am    Post subject: Re: Dynon Pitot Heat Warning with MGL EFIS Reply with quote

Connect a pull-up resistor, perhaps 1K Ω or more, between a positive source and the Dynon alarm wire.

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art(at)zemon.name
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PostPosted: Mon Mar 12, 2018 5:33 am    Post subject: Dynon Pitot Heat Warning with MGL EFIS Reply with quote

Joe,
What do I connect to the EFIS?
    -- Art Z.

On Mon, Mar 12, 2018 at 7:59 AM, user9253 <fransew(at)gmail.com (fransew(at)gmail.com)> wrote:
Quote:
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>

Connect a pull-up resistor, perhaps 1K Ω or more, between a positive source and the Dynon alarm wire.

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https://CheerfulCurmudgeon.com/"If I am not for myself, who is for me? And if I am only for myself, what am I? And if not now, when?" Hillel


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PostPosted: Mon Mar 12, 2018 7:11 am    Post subject: Re: Dynon Pitot Heat Warning with MGL EFIS Reply with quote

A picture is worth a thousand words.

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PostPosted: Mon Mar 12, 2018 8:13 am    Post subject: Dynon Pitot Heat Warning with MGL EFIS Reply with quote

Joe,
Got it. That'll work. Thank you.
    -- Art Z.

On Mon, Mar 12, 2018 at 10:11 AM, user9253 <fransew(at)gmail.com (fransew(at)gmail.com)> wrote:
Quote:
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>

A picture is worth a thousand words.

--
https://CheerfulCurmudgeon.com/"If I am not for myself, who is for me? And if I am only for myself, what am I? And if not now, when?" Hillel


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PostPosted: Mon Mar 12, 2018 12:46 pm    Post subject: Re: Dynon Pitot Heat Warning with MGL EFIS Reply with quote

I would try it without the pull-up resistor first. It might not be needed.

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PostPosted: Mon Mar 12, 2018 2:02 pm    Post subject: Dynon Pitot Heat Warning with MGL EFIS Reply with quote

How would you do that if the reference is ground?

On Monday, March 12, 2018, user9253 <fransew(at)gmail.com (fransew(at)gmail.com)> wrote:
Quote:
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>

I would try it without the pull-up resistor first.  It might not be needed.

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Joe Gores




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