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Originally Posted by dcb
a used oscilloscope
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You probably realize that you can also look at the injector waveform if you send it to your PC through the audio input. You also probably realize there are various PC-based scopes that use a special hardware interface to bring in data via a serial port. But I'm not enough of a scope user to know why someone might prefer a 'real' scope.
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this did not start out as a finished product suitable for permanent installation or for production, it was intended to be a simple to assemble and inexpensive DIY MPG gauge that would be useable ASAP
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I just want to offer my perspective as someone who has a lot of experience in some very professional software development organizations. You're doing a superb job of resisting feature-creep, and keeping focus on the original design statement. In other words, you're avoiding some of the most common reasons that projects fail. This takes a lot of discipline.