homemade ignition cutoff

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pants · 01-10-2008, 10:16 PM

Can someone smarter than me tell me if this would work?
The idea is to be able to cut power from ignition from a spare channel. I want the circuit so that the ignition circuit is closed when reciever output is 0v. Then at the flick of a switch on the TX the ignition is cut, without drawing to much current from reciever battery or frying ignition module or crashing plane etc
Mark

3ddd · 01-10-2008, 10:22 PM

change it to jpeg and we will look at it.for some unknown reqson all of a sudden i can't open bmp files.maybe max will jump in here and solve it for me

**wizard** · 01-10-2008, 10:32 PM

Here it is in jpg

Vic3D · 01-10-2008, 10:38 PM

That is the exact same reason why I switched from Electrical to Mechanical engineering. Freaking diagrams.

pants · 01-10-2008, 10:38 PM

here it is again but hopefully clearer

3ddd · 01-10-2008, 10:41 PM

well it looks like it should work ok but if it will transfer rf to your receiver is the next thing.a good engine running ground range check should tell you that

wildhare · 01-11-2008, 12:05 AM

It looks to me like you are assuming the signal from the receiver is a binary signal, 0V = 1 and 6V =0. This is not correct, it's not a go-nogo voltage type signal.

A servo output signal is a pulse which varies in length to command servo position. An on-off switch simply shifts the puls duration between something like 1.1ms to 1.9ms to signal full on or full off.

Your circuit will be switching on and off about 30 times per second.

TF

pants · 01-11-2008, 12:08 AM

Wildhare

Your absolutly correct. I thought it was to easy. Any suggestions to get over this

Andy Thomas · 01-11-2008, 01:52 AM

Easy,

http://www.smart-fly.com/Products/Ignition/ignition.htm

Ed Hornbuckle · 01-11-2008, 03:34 AM

I use a servo arm to actuate a micro switch between the battery and the ignition. I use the gear switch to turn power off. With this system, if you lose power to RX, then you are SOL.

RH1N0 · 01-11-2008, 05:45 AM

Here is my home made ignition cutoff: http://www.flyinggiants.com/forums/f...tml#post349874

Basically just an electronic version of a servo and mechanical switch but smaller, lighter and with no moving parts.

bodywerks · 01-11-2008, 09:01 AM

Budgetdude has the right idea there. Nobody with any logical sense builds their own smart switch - why waste your time and money doing so when there is already a $50, proven option?

wildhare · 01-11-2008, 10:48 AM

Maybe because it's fun?

This is a hobby after all.

Everything that is for sale was built by somebody when there probaby was another way to do it.

TF

KIM · 01-11-2008, 11:13 AM

it should work but unless you like to just build i would buy whats already avable out in the market place

KIM · 01-11-2008, 11:16 AM

just remember thats what makes this hobby so great lots of room for all at my age (older than dirt) i just want to fly ,and bigger because i cant see little lol

01-10-2008, 10:16 PM	#1
pants Flyin' Around Join Date: Apr 2007 Location: vacouver canada Posts: 29	homemade ignition cutoff Can someone smarter than me tell me if this would work? The idea is to be able to cut power from ignition from a spare channel. I want the circuit so that the ignition circuit is closed when reciever output is 0v. Then at the flick of a switch on the TX the ignition is cut, without drawing to much current from reciever battery or frying ignition module or crashing plane etc Mark Attached Images ignition cutoff.bmp (193.1 KB, 287 views)

01-10-2008, 10:22 PM	#2
3ddd tissue ? cry baby jack wagon! Join Date: Jan 2006 Location: pyote,texas Age: 58 Posts: 2,651	Re: homemade ignition cutoff change it to jpeg and we will look at it.for some unknown reqson all of a sudden i can't open bmp files.maybe max will jump in here and solve it for me __________________ Life's journey is not to arrive at the grave >safely and in a well preserved body,but rather to skid in > sideways,totally screwed up,worn out,shouting,"oh damn what a fine ride! AMA 98634 > HEY I GOT A DIVORCE----HELL YEA > Futaba, FROMECO:a good way to get a charge out of life,,3w all the way for a good day Last edited by 3ddd; 01-10-2008 at 10:31 PM.

01-10-2008, 10:32 PM	#3
wizard It will fly!!! Join Date: Jan 2006 Location: Washington, Indiana Age: 48 Posts: 9,044 Awards Showcase Total Awards: 3	Re: homemade ignition cutoff Here it is in jpg Attached Thumbnails 79.2 KB · Views: 181 __________________ Prevent Darwinism become a paramedic!!! Never try to teach a pig to sing! It wastes your time and it annoys the pig!!! Do not argue with an idiot. He will drag you down to his level and beat you with experience. Powered by Jim Beam

01-10-2008, 10:38 PM	#4
Vic3D Mother Huckin' Join Date: Jan 2006 Location: Caguas, Puerto Rico Age: 25 Posts: 4,304 Awards Showcase Total Awards: 3	Re: homemade ignition cutoff That is the exact same reason why I switched from Electrical to Mechanical engineering. Freaking diagrams. __________________ Pilot RC Aztech Aero/Secraft/EG Aircraft B&E Graphics, Jersey Modeler, TailDragger RC

01-10-2008, 10:38 PM	#5
pants Flyin' Around Join Date: Apr 2007 Location: vacouver canada Posts: 29	Re: homemade ignition cutoff here it is again but hopefully clearer Attached Thumbnails 20.6 KB · Views: 125

01-10-2008, 10:41 PM	#6
3ddd tissue ? cry baby jack wagon! Join Date: Jan 2006 Location: pyote,texas Age: 58 Posts: 2,651	Re: homemade ignition cutoff well it looks like it should work ok but if it will transfer rf to your receiver is the next thing.a good engine running ground range check should tell you that __________________ Life's journey is not to arrive at the grave >safely and in a well preserved body,but rather to skid in > sideways,totally screwed up,worn out,shouting,"oh damn what a fine ride! AMA 98634 > HEY I GOT A DIVORCE----HELL YEA > Futaba, FROMECO:a good way to get a charge out of life,,3w all the way for a good day

01-11-2008, 12:05 AM	#7
wildhare Bad-ass Super Contributer! Join Date: Jul 2006 Location: Texas Posts: 1,486	Re: homemade ignition cutoff It looks to me like you are assuming the signal from the receiver is a binary signal, 0V = 1 and 6V =0. This is not correct, it's not a go-nogo voltage type signal. A servo output signal is a pulse which varies in length to command servo position. An on-off switch simply shifts the puls duration between something like 1.1ms to 1.9ms to signal full on or full off. Your circuit will be switching on and off about 30 times per second. TF

01-11-2008, 12:08 AM	#8
pants Flyin' Around Join Date: Apr 2007 Location: vacouver canada Posts: 29	Re: homemade ignition cutoff Wildhare Your absolutly correct. I thought it was to easy. Any suggestions to get over this

01-11-2008, 01:52 AM	#9
Andy Thomas OK 1 Roll, No I Mean 2 Point Join Date: Jan 2006 Location: Farmington, MN Age: 36 Posts: 941	Re: homemade ignition cutoff Easy, http://www.smart-fly.com/Products/Ignition/ignition.htm __________________ Andy Thomas Team Airtronics Hobbyzone Bad Brad Graphics

01-11-2008, 03:34 AM	#10
Ed Hornbuckle Bad-ass Super Contributer! Join Date: Jul 2007 Location: Texas, United States of North Mexico Posts: 270	Re: homemade ignition cutoff I use a servo arm to actuate a micro switch between the battery and the ignition. I use the gear switch to turn power off. With this system, if you lose power to RX, then you are SOL. __________________ Hey Obama... Tax this

01-11-2008, 05:45 AM	#11
RH1N0 My wife said NO Join Date: Jan 2006 Location: BrisVegas, Australia Age: 37 Posts: 1,312	Re: homemade ignition cutoff Here is my home made ignition cutoff: http://www.flyinggiants.com/forums/f...tml#post349874 Basically just an electronic version of a servo and mechanical switch but smaller, lighter and with no moving parts.

01-11-2008, 09:01 AM	#12
bodywerks Bad-ass Super Contributer! Join Date: Jan 2006 Location: Tucson Age: 36 Posts: 5,229	Re: homemade ignition cutoff Budgetdude has the right idea there. Nobody with any logical sense builds their own smart switch - why waste your time and money doing so when there is already a $50, proven option?

01-11-2008, 10:48 AM	#13
wildhare Bad-ass Super Contributer! Join Date: Jul 2006 Location: Texas Posts: 1,486	Re: homemade ignition cutoff Maybe because it's fun? This is a hobby after all. Everything that is for sale was built by somebody when there probaby was another way to do it. TF

01-11-2008, 11:13 AM	#14
KIM Bad-ass Super Contributer! Join Date: Dec 2007 Location: tucson az Age: 63 Posts: 512	Re: homemade ignition cutoff it should work but unless you like to just build i would buy whats already avable out in the market place

01-11-2008, 11:16 AM	#15
KIM Bad-ass Super Contributer! Join Date: Dec 2007 Location: tucson az Age: 63 Posts: 512	Re: homemade ignition cutoff just remember thats what makes this hobby so great lots of room for all at my age (older than dirt) i just want to fly ,and bigger because i cant see little lol

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