Speeduino is now on Github Sponsors (Rather than Patreon): https://github.com/sponsors/noisymime
For any pieces of hardware directly related to Speeduino (ie Boards, components etc)
Hi Everyone

As part of my EFI conversion on a Triumph Stag, I needed an easy way to get a Speeduino compatible trigger for engine speed. So I had some boards made to condition the pulse from a classic ignition coil negative into a 5v square wave. Uses the same schematic as the CoilX board. So has an opto-isolator and inverting trigger to give a nice output. Tested working on my setup but no guarantees made and no liability etc...

Costs meant that I ended up with about 20 of these boards, and only need a couple myself, so they're up for sale if anyone wants one at cost plus postage.

I've listed them on my site https://invisiblefuelinjection.co.uk/sh ... rigger-pcb, use the discount code "speedy" to bring it down to cost price :)

Connections needed are:
  • Engine Ground
    Coil Negative
    ECU 5V
    ECU Ground
    RPM trigger
Yes, but input voltage is limited on some, such as the current MAX conditioner versions. Those for example have a 160V limit on input signal as-is, which is at the low-end for coil(-) flyback. With some calculations, the input shunt and resistors could be configured to reduce voltage in order to make it suitable for coil(-).

The DSC conditioner has shown it can do coil(-) signals along with most other kinds of signals, but like the CoilX I don't know if there is a limit for some high-V and CDI coils. Some of those hit 450V flyback. A search will show discussions we've had on the coil(-) topic in recent years with some design theory and tested updates if you're digging.

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