Now that we have a little idea about LEDs, let’s take a look at how to interface it with evive and see it in action.Įvive already has an LED connected to Digital Pin 13.
To limit the value of current we use resistors, the value of which is calculated using Ohm’s law. Current Limit/Rating: Their current rating is the maximum value of the current they can withstand if you pass a current greater than that value, they may blow up! The safe value of current for LEDs is usually around 20 milliamperes.As the current increases, the brightness also increases, and vice-versa. This law can be exploited to vary the brightness of the LED, by changing the amount of current passing through it. Intensity: We know that according to Ohm’s law, currents increases when the voltage across the circuit is increased.If you look closely at the base of the LED, you’ll notice that the boundary is flat/cut above one of the terminals. Out of the two, the longer one is the positive terminal, and the other is negative. Connecting them in reverse might blow them up. from the positive terminal to the negative terminal. Therefore, they allow the current to pass ONLY in one direction, i.e.
Polarity: Just like batteries, LEDs also have a positive and negative terminal.Let’s have a look at three important concepts we must keep in mind when dealing with LEDs: Light emitting diodes, aka LEDs, are tiny light-bulb-like devices that glow when current passes through them. What is LED(Light Emitting Diode) and How do LED works?
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