Pick up signal from car contributinbase ignition system.

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#1
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Dear all

Any idea how to pick up the ignition signal in old car, 80's.

There is a ignition coil, distribution-based, and I really can't find or afford the Hall effect sensor from nearby electronics store in my town. And the ignition system was solidly installed on the engine's base.

So how can I do it?

Scud88

"Chill out with Atmel Corp."
- Scud88.

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Wrap a piece of copper braid around the spark plug wire. Solder a wire to it. Make a voltage divider with a big resistor (couple meg?) and whatever resistor it takes to get it down to 5v... use with a schmidt trigger type input

Imagecraft compiler user

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thanks

i have to try that tomorrow

"Chill out with Atmel Corp."
- Scud88.

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quick question

Quote:

Wrap a piece of copper braid around the spark plug wire.

the spark plug wire have the insulator around and u mean I have to warp a cooper braid around the wire, around its insulator, right?

"Chill out with Atmel Corp."
- Scud88.

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yes... capacitive pickup

Imagecraft compiler user

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well

how about inductive pickup, i just heard this word for first time a couple days ago.

"Chill out with Atmel Corp."
- Scud88.

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I don't know if the magic that makes a 30KV pulse jump thru the rubber on the spark plug wire is capacitance or inductance, but dont forget the hi ohm resistor. You'll need it.

Imagecraft compiler user

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should the resistor be a ceramic resistor? I think I'll have some of these but their resistance are not that high.

let's talk about the circuitry

Of what I think should be like a buffer first after get the voltage from the spark plug wire. And then connect it to comparator, schmidt trigger type, to make it a square wave.

"Chill out with Atmel Corp."
- Scud88.