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Neopixels Neopixels When connecting NeoPixels to any live power source or microcontroller, ALWAYS CONNECT GROUND (–) BEFORE ANYTHING ELSE. Conversely, disconnect ground last when separating. Adding a 300 to 500 Ohm resistor between your microcontrollers data pin and the data input on the first NeoPixel can help prevent voltage spikes that might otherwise damage your.