29 917
modifications
Modifications
Sauter à la navigation
Sauter à la recherche
Ligne 1 :
Ligne 1 : + + + + + + + + + + + + + + +
NeoPixel-UserGuide-Bonnes-Pratiques (voir la source)
Version du 21 février 2014 à 07:58
, 21 février 2014 à 07:58aucun résumé de modification
{{NeoPixel-UserGuide-NAV}}
{{NeoPixel-UserGuide-NAV}}
== Usage incorrect = destruction ==
{{ADF-Image|NeoPixel-UserGuide-Bonnes-Pratiques-01.jpg|640px}}
* Before connecting NeoPixels to any power source, add a large capacitor (1000 µF, 6.3V or higher) across the + and – terminals as shown above.
* Place a 300 to 500 Ohm resistor between the Arduino data output pin and the input to the first NeoPixel. This resistor must be at the NeoPixel end of the wire to be effective! Some products already incorporate this resistor…if you’re not sure, add one…there’s no harm in doubling up!
* Try to minimize the distance between the Arduino and first pixel.
* Avoid connecting NeoPixels to a live circuit. If you simply must, always connect ground first, then +5V, then data. Disconnect in the reverse order.
* Observe the same precautions as you would for any static-sensitive part; ground yourself before handling, etc.
* NeoPixels require a 5V data signal. If using a 3.3V microcontroller you must use a logic level shifter such as a 74HCT245.
* Make sure that your connections are secure. Alligator clips do not make reliable connections to the tiny solder pads on NeoPixel rings. Better to solder a small pigtail wire to the ring and attach the alligator clips to that.
Some of our NeoPixel project guides fail to mention the above precautions…they were written before these lessons were learned, and will be updated as required. The design changes are usually minimal (e.g. add inline resistor on data pin in circuit diagrams).
Smaller, battery-operated projects (e.g. FLORA and sewables) are usually fine omitting the capacitor and/or the resistor, but more substantive projects incorporating NeoPixel rings, matrices or a meter or more of NeoPixel strip, or using a plug-in power supply should definitely include both!
{{NeoPixel-UserGuide-TRAILER}}
{{NeoPixel-UserGuide-TRAILER}}