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Practical Arduino: Cool Projects for Open Source Hardware by Jonathan Oxer, Hugh Blemings

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Chapter 11. Oscilloscope/Logic Analyzer

One of the frustrating things about developing and debugging electronic circuits is that you can't look inside the circuit to see what is happening. Even with a circuit laid out before you on a workbench and powered up, it may seem like you're in the dark, unable to figure out why an input change or alteration in one part of the circuit isn't having the effect you expected. Sometimes it can feel like you're working with a blindfold on.

A multimeter lets you measure a constant or slowly changing voltage, such as checking whether ICs or other devices are being powered correctly, with 3.3V or 5V as appropriate. But they're no good at helping you visualize signals that change rapidly, such as a stream of data ...

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