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Idiot light circuits

 
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bob.verwey(at)gmail.com
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PostPosted: Thu Jan 03, 2013 8:11 am    Post subject: Idiot light circuits Reply with quote
I am hoping someone can help with a robust water temp and oil pressure idiot light circuit/s.The aim is to get a flashing warning with a reset button, that times out to an adjustable period, of say 30 seconds, before re-ignition.


I plan to use dedicated probes for these circuits.
My temperature probe is 175 ohms at 20 deg C and 20 ohms at 110 deg C.
The oil pressure probe shows 9 ohms at 0 pressure and 60 ohms at 80 psi.


Best...
Bob Verwey
IO470 Bonanza A35 ZU-DLW
V6 Chevy Safari ZU-AJF  

[quote][b]

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nuckolls.bob(at)aeroelect
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PostPosted: Thu Jan 03, 2013 9:01 am    Post subject: Idiot light circuits Reply with quote
At 10:10 AM 1/3/2013, you wrote:

Quote:
I am hoping someone can help with a robust water temp and oil pressure idiot light circuit/s.
The aim is to get a flashing warning with a reset button, that times out to an adjustable period, of say 30 seconds, before re-ignition.

I plan to use dedicated probes for these circuits.
My temperature probe is 175 ohms at 20 deg C and 20 ohms at 110 deg C.
The oil pressure probe shows 9 ohms at 0 pressure and 60 ohms at 80 psi.

Best...

Bob Verwey
IO470 Bonanza A35 ZU-DLW
V6 Chevy Safari ZU-AJF


I'm aware of no off-the-shelf solutions to your
design goal. The functionality you describe
can be implemented with discrete components
consisting of two comparators (one for each
temperature sensor) and some logic gates
configured to do some timing for flashing
and hold-off intervals.

The ECB used to craft our 9012 wigwag flasher
is one of a family of 'do-lots' boards on
which I will build a constellation of
products. The 9012 board has two inputs
to analog-digital converters, two outputs
that drive lamps and a digital input for
a 'cancel' push button.

Perhaps one of our software gurus would
like to step up to this application. If so,
the hardware and packaging is done.



Bob . . . [quote][b]

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