Arduino rgb led strip12/2/2023 ![]() If that color is now fully bright, then you have shown that 12v input fully turns on the driving transistor, but 5v does not. Connect the +12v to one of the inputs at a time. Note that if this is the case, the LED amplifier may also overheat - the transistors dissipate more power when not fully on, which raises the temperatures, probably leading to shortened life at best, possibly release of the magic smoke that makes electronics work. The blue LEDs would be the first to suffer from this voltage sag. In that case, the LEDs may be seeing less than 12V. Driving it with 5v may not fully turn on the LED driving transistors. (Or from another perspective, with 3 in series the LEDs get 6-9v and thethe resistors and power amp need to drop the 3-6v from a 12v supply, versus a single LED dropping 2-3v and the resistors and power amp dropping the other 9-10v).Īll is good, if you are driving each color with close to 12v.īUT - your LED amplifier may expect more than 5v inputs in order to be fully on (eg: if it uses conventional FETs). Driving 3 in series is good - the same current travels through 3 LEDs producing 3 times as much light per amp than if each LED was separately driven. 3 Red LEDs take about 6V to be fully on, while 3 blue LEDs take about 9V when you have 12v the resistors absorb the rest of the voltage drop (higher value resistors are needed for the red LEDs if you want about the same current in each color). ![]() Your 12 strip probably puts each set of 3 LEDs in series.
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