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TI-83 as data logger?
Has anyone thought about using a TI-83 as a data logger for hypermiling? It's cheaper than a Scangauge (especially if it's used!), is relatively easy to program, and has a very complete library of math functions just to start. And of course, you can connect it to your PC to save data for long term logging and it's also a very good calculator.
One implementation could be use one I/O line for the speedometer input and the other to monitor the fuel injection. A very simple circuit consisting of two resistors and two zener diodes will be all that's needed to interface it. As a bonus, it will work in cars too old for a Scangauge.
A more complex implementation could be to use an interface chip to connect it to the debug connector.
If a TI-84 or TI-89 is used instead (those calculators have clock chips), the average speed can also be logged. (Of course, that probably wouldn't be worth the extra cost.)
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If America manages to eliminate obesity, we would save as much fuel as if every American were to stop driving for three days every year. To be slender like Tiffany Yep is to be a real hypermiler...
Allie Moore and I have a combined carbon footprint much smaller than that of one average American...
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