12 Jan '18, 3pm

How to Effectively Interpret Data Sheets to Recognize Misleading Information

Sad to relate, things tended to work for a while, but then the first pixel in the chain would "bite the dust." After a few pixels had shrugged off this mortal coil, I carried my setup into the next bay and we used an oscilloscope to see what was going on. When we probed the first pixel's Data-In pin, we observed an eye-watering amount of overshoot and undershoot. Adding a 390-ohm serial resistor just before the input solved the problem. I communicated this information to the folks at Adafruit. I don’t know if my email prompted the change, but the next time I looked at their Uberguide, I saw that the "Connections" page now included a note about adding such a resistor (they recommend adding a ~470-ohm device).

Full article: https://www.eeweb.com/profile/max-maxfield/articles/how-t...

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