xfacta's code can serve your needs for sure. You would have to get all of the code on one board. All you have to do is modify the output and send it to a laptop or pc. You could use a serial connection to do it.
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Thank you for all your help, I appreciate the interest in the topic. It’s clear I have quite a bit to learn in the subject… I’ll be sure to post and pictures of my progress and ask any questions I may have here.
You should have an easier task than I, most of my code is for displays, graphics and deciding on valid values and whether to alert or not. The actual gathering of data is only a small part of the code, and logging it to somewhere should be easy.
I have heaps of "debug" code in there too, which isnt needed for normal operation.
Just in case you (or anyone reading) decides to use displays I should mention the bar graphs are a variation on a commonly available sketch for "ring meter". I tried using circular gauges but they take up too much screen real estate (but look nice) and the large digital text is much more readable. The tacho and speedo bar graphs are really there just for show. The fuel and temperature graphs are actually usable and preferable to trying to read exact numbers for litres or degrees.
What exactly did you tap into for your tacho? Is it a position or ignition?
I have an open-collector tacho signal from the engines ECU. That has been my one luxury. Everything else I had to work out my own interface.
However for a normal points system there would be numerous interface circuits that would work, I'll see if I can dig something up.
My speedometer sendor (VSS = vehicle speed sensor) is a reluctor type in the gearbox, so I have a conditioning circuit to suit that. The speedometer code will work with anything that can provide pulses proportional to speed. (same with the tacho - just give it the pulses)
There is this ignition coil interface, it's probably going to be the most reliable I've seen.
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It is another site. The app note will also give you links to other information on automotive electronics. I have reposted it here if it gets lost again. https://www.st.com/resource/en/application_note/cd00181783-protection-of-automotive-electronics-from-electrical-hazards-guidelines-for-design-and-component-selection-stmicroelectronics.pdf
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I ended up looking it up… thank you very much I think it’ll make a good basis for a notebook
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