I would like to data log commanded spark events for my vehicle. It
uses a Distributorless Ignition System which consists of a engine
control computer, a control module, and a coil pack. The coil pack is
fed 12v and has control wires. When a control wire is brought to
ground by the control module, current can flow through a coil primary
winding. The control module holds the ground for a ECC demanded dwell
at which time the ground is raised, causing the coil to discharge.
I want to monitor when each control wire is being held to ground.
My monitoring device can take a 0-5v DC input.
Do I need to be concerned with the current in the primary circuit that
I will monitor voltage on?
Is there a circuit design, or a discrete component that will scale the
12v on/off signal into a 0-5vDC output I can push into my DC input?
This will need to operate fairly quickly.
Other suggestions?
Thanks
