12v ignition cut device using ardiuno

[knudsenuk]

Hello all, I am trying to design a way to cut the ignition for a short period based on an input to an arduino. Everything works except for the fact that I can only supply a 5v "on" to the base of the transistor, resulting in the output being 5v too, not the desired 12v. Can anyone suggest a solution. It needs to be fast, so a relay maybe too slow. Any help appreciated

[moffy]

Have an NPN transistor's collector connected to a PMOS transistor, with a couple of resistors, switch the +12V.

[Phil1977]

If you want to switch on the high side, in other words on the +12V you should use a PNP-transistor.

I´m not sure if you are aware of the nature of switching highly inductive loads on a vehicle net. A simple transistor without dedicated back-emf protection is more or less dead within miliseconds.

[langwadt]

https://xyproblem.info/

[knudsenuk]

I intend using a solid state relay to do the actual switching of the load.

[Andy Chee]

What part number is your proposed solid state relay for actual switching?

[John B]

Am I right in thinking you are trying to implement an ignition cut on fast gear changes?

If so, many, many more details are needed.

The proper way to do any ignition timing alteration is from the source, ie a programmable ECU.