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I'm planning to have a killswitch for my Fuji-Imvac magneto engine.

My idea is to use an Arduino relay and control it direct from receiver chanel.
The relay have 3 input pins, - + and signal.
Is it possible?
Can the receivers channel signal trigg the Arduino 5V relay.
If so, then I can ground the magneto and kill the engine (hopefully).

You need to say exactly what your "arduino relay" is so that we can know if it's made to expect an RC signal or not. Likely not, so you'd need something to process it... like an arduino with an appropriate program written for it.

I guess a ready available RC switch could control a relay..

João
EDIT: Also, a relay with 3 pin? Don't know any..

This is my plan, but can I have a signal from receiver to activate the relay? (hope the picture will show up)

I have an opto killswitch from RCXL but it doesn't work on the magneto ignition.

João, wich kind of RC switch do you mean?

Here is a similar projekt. See https://www.pololu.com/product/2804

Again please link the exact model of relay board you have. It just looks like a relay with a buffered input, not an RC-compatible input like the pololu one.

As Kilrah said, link to the one you have please..

João

It's sold by a Swedish company without spec.,

but here is the closest I can find (inkl. datasheet)

http://www.circuitbasics.com/setting-up ... e-arduino/

Thanks for your patience.

Ok, then as Kilrah already said, that won't work. You would need some kind of circuitry or a microcontroller, for example an arduino board, to read the receiver's pulses and then trigger the relay.
Please google "RC Switch".
Hobbyking sells at least one. Then you have to connect your relay to it.
An arduino would probably still be the best, but you would have to code it and prigram it..

João

Thanks for your help.

I have ordered a Pololu RC Switch with relay.
Threshold 1700 mikrosek hopefully works.

I will give feedback.

BR
Kenth

It should work.. The product description says:

"The activation threshold and direction are configurable, and a safe-start feature reduces the likelihood of unexpected activation."

So, I guess it will work

João

The Pololu RC switch works great together with my magnetic ignition.
It has an adjustable threshold of approximately 1700 μs.

Thanks for support.