Futterama
Member
Hi forum,
I have this magneto coil on a gasoline engine:
https://www.davesmotors.com/s.nl/it.A/id.1402/.f
There is a stop button mounted on the coil and when pressed, the button shorts the 2 terminals which are connected to an internal coil which then destroys the magnetic field inside and prevents the main HV coil from creating the voltage for the sparkplug.
When the engine is not running, I would like to detect if the stop button is pressed. So basically I wish to detect whether there is a short between the coil terminals or not.
I have done a few measurements on the coil connected to the terminals. It seems that the resistance is only 1ohm. Since there is also resistance in the wires and also in the button, I'm not sure measuring for resistance is a reliable approach.
Could I somehow measure for inductance? I have a PIC available but don't know how I could use that to measure for inductance so I would like to hear your suggestions.
Thanks.
I have this magneto coil on a gasoline engine:
https://www.davesmotors.com/s.nl/it.A/id.1402/.f
There is a stop button mounted on the coil and when pressed, the button shorts the 2 terminals which are connected to an internal coil which then destroys the magnetic field inside and prevents the main HV coil from creating the voltage for the sparkplug.
When the engine is not running, I would like to detect if the stop button is pressed. So basically I wish to detect whether there is a short between the coil terminals or not.
I have done a few measurements on the coil connected to the terminals. It seems that the resistance is only 1ohm. Since there is also resistance in the wires and also in the button, I'm not sure measuring for resistance is a reliable approach.
Could I somehow measure for inductance? I have a PIC available but don't know how I could use that to measure for inductance so I would like to hear your suggestions.
Thanks.