![]() 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. Smaller values will draw more supply current when the N-chan MOSFET is on, larger values are more susceptible to noise when the N-chan MOSFET is off.In this project, I will discuss what an RGB LED is, how to interface an RGB LED with Arduino and finally, how to drive an RGB LED using Arduino UNO. You can probably get away with anywhere from 1k up to 100k. Resistor values were chosen semi-arbitrarily. Here's a basic example which uses a P-chan MOSFET to drive the LED's, and a N-chan MOSFET/pullup resistor to control the P-chan MOSFET: (again, ignoring any LED current limiting schemes) ![]() ![]() If your micro is not able to achieve either of these levels, you can use a second transistor to drive the transistor in series with the LED(s). Alternatively, if you have use an up-stream P-Chan MOSFET, your control signal will need to be at least the level of the source voltage to turn the LEDs off (this is the MOSFET pin source voltage, not supply voltage). If what you want is to control individual LED's, then you might still be able to use an N-Chan MOSFET, but your control signal will need to be at least Vthresh above the source voltage to turn the LEDs on. Simulate this circuit – Schematic created using CircuitLab Here's an example circuit, ignoring LED current limiting schemes for now. ![]() If all you need is to turn all the LEDs on/off using PWM, you can attach the N-chan MOSFET between the common cathode and ground. ![]()
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