![]() As the PWM output gives 0 to 5 V output, LED brightness varies from 0 to 100% – which means varies the amount of that color from 0 to 100%. The Arduino varies the brightness of all the RGB LEDs by applying PWM output through its D9, D10, and D11 pins. The same 12 V supply is given to the Arduino NANO board and ULN chip also. The LED strip is a common anode type, so its common terminal is given a +12 V supply. The ULN2003A chip is required to provide the required current to the LED strip. The analog outputs D9, D10, and D11 drive G, R, and B inputs of the strip through the current driver chip. And it requires only two components, Arduino NANO and the current driver chip ULN2003A. Now let us see how we can control the RGB LED strip using Arduino.Īs shown in the figure, the RGB LED strip contains 100 to 120 SMD LEDs. This much is enough to give you a complete idea. Its 3 analog outputs are connected with R, G, and B terminals and change all three LEDs’ brightness. To generate different colors in RGB LED, we are going to vary the brightness of RED, GREEN, and BLUE LEDs from 0 to 100%Īnd we know Arduino can easily vary the brightness of LED! So that’s it……Īrduino has an analog output (PWM output) that will vary LED brightness. To generate different colors from RGB LED, we have to vary the intensity (brightness) of RED/GREEN/BLUE LED. Here, in our case – the color amount is color intensity – which means the brightness of RED/GREEN/BLUE LED. ![]() So next question is how to vary the amount of these three colors? (It is possible in painting as we can change their amount or dilute them, but here it is not so!) To generate other colors, we have to vary the amount of RED, GREEN, and BLUE color because we know the mixing of these three basic colors in different amounts will generate all colors. If we turn on two LEDs together, then we have 3 more colors.Īnd if we turn ON all 3 LEDs together, then? Yes, it’s a white color.īut still, 3 + 3 + 1 = 7 colours! What about more colors like PINK, ORANGE, SKYBLUE, LIGHTGREEN, etc.? So here is the logic to generate other colors. What about other colors? How can we get (generate) all colors from RGB LED? Now you all might be thinking that there are only 3 LEDs in this, and we can have only 3 colors RED, GREEN, and BLUE. While in common anode SMD RGB LED, common terminal is connected with +Ve supply and R, G or B terminal has to be connected to ground. It is understood that to turn on any LED in common cathode type RGB SMD LED, we have to apply +Ve supply to R, B, or G terminal, and the common terminal is connected to the ground. Please have a look at the figure given below. This common terminal can be either anode or cathode, and based on it, there are two types of such LEDs (1) common cathode and (2) common anode. Three terminals are for RED (2), GREEN (4), and BLUE (6) LEDs, while the other 3 terminals are common terminals. Before directly jumping to the LED strip, first, let us understand the single-cell – the building block of the strip – and that is one RGB LED SMD typeĪs you can see in the above figure, a single RGB SMD LED is a combination of 3 tiny individual RED, GREEN, and BLUE LEDs.You can do all these and play with such RGB strips using ARDUINO, and it’s very easy and simple. What if I say all these you can do with our ARDUINO? Sounds interesting…….?!?!!!? So do you want to build something like this? Like a multicolor LED chaser, fading, and other animation effects using multicolor LEDs? I bet you all might have seen somewhere the “ jaw opening” multicolor led chasing, fading, and animation effect.Īll these are possible using such RGB LED strips. These RGB LED strips can generate almost all the colors and their shades using different combinations of RED – GREEN – BLUE.Įven they can generate different “ eye-catching” illuminating effects like multicolor, rainbow, LED chaser, fading, etc. So such strips have 4 connections (1) +12 V (2) R – for Red LED (3) G – for Green LED (4) B – for Blue LED RGB strip with separate R, G, B inputs: these types of RGB strips have three separate inputs for Red, Green, and Blue colors with one more common input as +12V. ![]()
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