![]() PWM in ArduinoĪrduino UNO has 6 Pins that can be used to generate PWM Signals: 3, 5, 6, 9, 10 and 11. It is measured in percentage and it indicates the voltage between OFF and ON levels (usually 0V and 5V).įrequency of the pulse or the PWM Signal plays an important role as well and it must be sufficiently high than what the device feels its affect. There are two important factors to consider when dealing with PWM Technique: Duty Cycle and Frequency.ĭuty cycle indicates the duration for which the pulse is HIGH over it period. PWM technique can be used to control the brightness of an LED, the speed of a motor or the direction of a servo motor. PWM is a technique where the amount of power delivered to a device can be controlled accurately and efficiently. The technique used to control the brightness of an LED is called Pulse Width Modulation or simply PWM. You might already have performed an experiment with dimming an LED using Arduino, where the brightness of LED is controlled either directly using the program or by interfacing a potentiometer. White – All the three Red, Green and Blue LEDs are ONĪs I said before, you can generate a wide range of colors using an RGB LED just by varying the brightness of the individual R, G and B LEDs.Magenta – Both Red and Blue LEDs are ON.Yellow – Both Red and Green LEDs are ON. ![]() The following image shows a few possible colors of light that can be generated using an RGB LED. Using an RGB LED, you can ideally generate any color by controlling the brightness of the individual Red, Green and Blue LEDs. I happen to have a SMD type 3W RGB LED and I felt that it is important to mention a little bit about that.Īs you can see from the above image, the SMD type RGB LED has 6 leads, in contrast to only 4 leads in its through-hole counterpart.Īn SMD RGB LED also contain three individual LEDs, each for Red, Green and Blue lights but each internal LED has its dedicated anode and cathode leads. With the increasing popularity of SMD components, even RGB LEDs are being manufactured. The following image shows a Common Cathode RGB LED along with its driving circuit.Īs mentioned earlier, a through-hole RGB LED has 4 leads. The following image shows the internal layout of a Common Anode type RGB LED and also its driving circuit.Ĭoming to a Common Cathode type RGB LED, you might have guessed the internal layout and the driving circuit by now. Related Post: RGB LED Bulb How to Drive an RGB LED? Common Anode type RGB LED I will show you how to drive both the variants. In this project, I will use a Common Cathode type RGB LED. Generally, the common cathode variant is found more frequently than the common anode variant. The through-hole variant of an RGB LED has 4 leads: one lead for each individual color (Red, Green and Blue) and the fourth one is the common lead (which can be either a cathode or anode). Since an RGB LED consists of three individual LEDs in a single package, the number of leads is different than that of a regular LED, which has two leads (one for cathode and the other for anode). ![]() Appearance wise, an RGB LED looks very similar to a regular LED except that an RGB LED has three LEDs, each for Red, Green and Blue lights and all these are housed in a single package. Hence, it is called RGB LED (RGB stands for Red, Green and Blue). RGB LED is a type LED which emit multiple colors i.e. There are several types of LEDs available today and RGB LED is one such fascinating variant of LED. Coming to an LED, it is short for Light Emitting Diode, which is a semiconductor device, that emits light when current passes through it. ![]() ![]() So, from the first Arduino program itself, you will begin working around LEDs. In this program, you will Blink an LED on and off at a certain delay. When you begin your adventure with Arduino, the first Arduino program you will write or start your Arduino experience with is the Blink program. Circuit Diagram of Arduino RGB LED Interface. ![]()
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