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An LED is a light-emitting diode. Lighting an LED is considered the "Hello world" of a circuit design, and it can be as simple as using a series resistor, or it can get more complicated, involving PWM and multiplexing.
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Low-side LED switch BJT not switching
An LED (LED_D) is connected in series with the drain of the MOSFET. The LED is always powered by 12 V, so the AO3400A should switch its negative-side between ~0 V and hi-Z. …
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WS2813 LED data permanently latching on power-on
No signal can be sent over the data-line to clear the LEDs, but a power cycle usually will solve the issue, and turn off the LED, making it once again receptive to data from my microcontroller. …