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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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How to allow current over a certain voltage

The LDR I use allows current and letting LED smoothly based up to amount of darkness. The Voltage after 2.3 k resistor is 0.7 maximum .. All i want to do is to let led run on the darkest moment. … So only if it is fully dark the LED must light up .. Not smoothly relative to darkness. What should i do for this ? FIX: the source voltage is 6 Volts …
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