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Logic Analyzer

A logic analyzer is one of those tools you don’t always need, until you really need it.
It’s perfect for visualizing and debugging digital communication protocols like I²C, SPI, UART, and more.

What it’s for

  • Debugging serial protocols
  • Seeing the actual data on digital lines
  • Finding timing issues or unexpected noise
  • Reverse engineering or tapping into unknown devices

How I use it

  • Verifying that I²C devices are responding properly
  • Checking baud rates and data flow on UART
  • Confirming SPI timing between a microcontroller and a peripheral
  • Triggering capture on a specific condition to catch rare events

Types

  • USB analyzers – Small, affordable, and powered by software like PulseView or DSView. Great for most hobbyist work.
  • Standalone analyzers – More advanced models exist, but I don’t use them often.

Tips & Usage Notes

  • Keep wire lengths short — long flying leads can introduce noise
  • Label channels clearly in software to avoid confusion
  • Triggering is your best friend: set it carefully
  • Sample rate matters — make sure it’s at least 4–5× your expected signal frequency
  • It’s okay to start with an 8-channel analyzer — you rarely need more right away

Software