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05-24-2017, 11:23 AM
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Join Date: Feb 2005
Location: Shawnee, Kansas
Posts: 804
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Best master switch saver?
I'm handy with electronics and I'm sick of killing my battery because I forget to turn off the master... I know, this is a "millenial problem" like FADEC and glass panels. But it's getting old and a $5 circuit can fix it.
Requirements:
- Must not accidentally turn off on final after a long flight (simple timer)
- Must have very-very low current when off (<1pA)
- Be cheap and reliable
- Avoid failing-off... ie if it dies, stay on
Design
Use a micro-controller connected to a sensitive vibration detector that resets a one-hour timer. After one hour of near-total-non-movement or 2 seconds of holding the power-switch; then collapse the power supply and de-energy the master solenoid. An LED would indicate "On" when solid, blink when in some state of turning-off.
It would be installed in place of the master switch on an aircraft and could be built using a single LED momentary switch.

Components;
I'll post an updates as I'm building and when it's done.
__________________
Bruce Meacham
Building RV-4A 18ZM
Built/Own RV-4 254MM
First RV RV-3 3456B
VAF annual donation on autopay
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05-24-2017, 11:37 AM
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Join Date: Aug 2010
Location: Wichita, KS
Posts: 1,958
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I'm imagining a simple piezo buzzer mounted out of sight behind the panel, and powered by the master bus through the normally-closed side of a standard oil pressure switch.
Same principle as the "Low Oil Pressure" annunciator light in common use. A light can be easy to miss. An annoyingly loud buzzing noise, not so much.
__________________
Kurt W.
RV9A
FLYING!!!
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05-24-2017, 11:47 AM
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Join Date: Mar 2014
Location: Prescott, AZ
Posts: 739
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Or you could just put a pressure switch under your seat (like cars have for seatbelts), connect it to the master power and a piezo horn. As soon as to get out and the master is still on the horn blows... I'm not sure I would trust the only source for aircraft power on a handful of sensitive electronic parts. IMHO.
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05-24-2017, 11:56 AM
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Join Date: Feb 2005
Location: LSGY
Posts: 3,198
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strobes
I always leave my strobes on - can't miss those when I forget the master.
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05-24-2017, 11:58 AM
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Join Date: Apr 2014
Location: Port Orange, Fl
Posts: 931
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Quote:
Originally Posted by rv8ch
I always leave my strobes on - can't miss those when I forget the master.
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Same here ...
__________________
Tom
Port Orange, Fl
EAA #51411
RV-12 N121TK ELSA #120845; first flight 06/10/2015; 700 hrs as of 02/2020
RV-12 N918EN ELSA #120995 Eagles Nest Project; first flight 05/18/2019
SPA Panther N26TK; First Flight 03/13/2020
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05-24-2017, 12:06 PM
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Join Date: Feb 2005
Location: Shawnee, Kansas
Posts: 804
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Thanks
Buzzer is simpler and I've had one like that, I've had this idea for a long time. And it's never after a flight that I leave the master on... it's after working on it.
__________________
Bruce Meacham
Building RV-4A 18ZM
Built/Own RV-4 254MM
First RV RV-3 3456B
VAF annual donation on autopay
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05-24-2017, 12:39 PM
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Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,189
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My flap motor often reminds me of two things after shutting the engine down 
__________________
Ray
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)
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05-24-2017, 12:40 PM
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Join Date: Jun 2014
Location: Cotulla, TX
Posts: 179
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+1 strobes on all the time
Never thought I would leave my master switch on. After 20+ years of flying, it finally happened. So now I fall into the group of people that leave the strobes on all the time. When I get out, strobes will be a gentle reminder that I left the master on. Not sure about the master switch on a timer plan. Sounds like a potential point of failure.
+1 strobes
__________________
Frank Leone
RV-10 Purchased
RV-12 Under Construction by my kids, wife & me
Donated 8/2018
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05-24-2017, 01:07 PM
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Join Date: Apr 2014
Location: Port Orange, Fl
Posts: 931
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Quote:
Originally Posted by tomkk
Same here ...
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... although I must admit, the one time I left the Master on I had turned the strobes off to work on the plane.
__________________
Tom
Port Orange, Fl
EAA #51411
RV-12 N121TK ELSA #120845; first flight 06/10/2015; 700 hrs as of 02/2020
RV-12 N918EN ELSA #120995 Eagles Nest Project; first flight 05/18/2019
SPA Panther N26TK; First Flight 03/13/2020
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05-24-2017, 01:13 PM
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Join Date: Feb 2005
Location: LSGY
Posts: 3,198
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car keys
If working on the plane, tape your car keys to the master switch, or hang them on the switch if it's a toggle switch. Can't leave without your car keys!
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