The symbol for a diode (to the right in Figure 1) looks something like an arrow pointing in the direction of the forward current. The PWM signals are the simulating analog output voltage and different voltage levels to the different colors (Red, Green, and Blue) of the LED.A diode is a passive component made with semiconductor materials (a chip) that conducts current flowing in one direction but does not conduct current flowing in the opposite direction. The Arduino Uno generates PWM signals and its ADC (A0, A1, A2) reads the analog voltage across the potentiometers. While PWM D9, D10, and D11 pins are connected to the red, green, and blue via 100ohms resistors respectively as shown in the figure. 1kilo ohms potentiometers or trimmers – 3įrom the figure, A0, A1, and A2 pins of Arduino Uno are connected to the three potentiometers, which represent three colors red, green, and blue.To set the color of this kind of LED, we should have.Using an Arduino UNO, we can construct common cathode RGB LED and common anode RGB LED. It uses Constant Current Reduction (CCR) or Pulse Width Modulation (PWM) to set the color and control the output of this LED. The setting of the color of this LED using an Arduino Uno is very simple. Setting the Color of an RGB LED using an Arduino Uno The cathode terminal of this should be connected to the negative terminal of the given supply. In order to control the output or color of each internal LED, High input signal or VCC should be applied to the red, green, and blue terminals of the LED. In this type, all the cathode terminals of the internal colored LEDs (red, green, and blue) are connected to the cathode terminal of the RGB LED as shown in the figure. The anode terminal of this LED should be connected to the positive terminal of the given power supply.Ĭathode refers to the negative terminal. In order to control the color of each internal LED, we have to give Low input signal or just red, green, and blue terminals should be grounded. All the positive terminals of the internal colored LEDs of the RGB LED are connected together to the external anode terminal of the RGB LED as shown in the figure. These are categorized into two types, they are,Īnode refers to the positive terminal. The order of terminals should be followed from the left side i.e, red, cathode or anode, green and blue. It is important to note that in this LED, the order of these terminals should not be changed. From the figure, we can see that the second-longest terminal from the left side of the LED represents cathode or anode. Another terminal represents the type of LED. The RGB LED structure is, it is a 4-terminal LED with 3 colored LED in one chip. It is also known as tri-color LED or multi-color. It has 4 terminals, in which 3 terminals red, green, blue, and another terminal represents anode or cathode of LED type. These are widely used in stage designing, home decorations, LED matrix, displays, outdoor lightings, and in some electronic applications. It can produce any color as output by a combination of 3 colors red, green, and blue to indicate the operation of the device. What is an RGB LED?ĭefinition: The three-colored LED’s like red, green, blue are combined together in one package (one LED) to emit different colors as output is called RGB LED. This article describes how to generate different colors using the RGB LED. RGB LEDs comes under the Multi-colored LED category. Usage of Multi-colored LEDs in the device reduces, cost, power and emits more than one colored light like red, blue, green, etc when compared to single-colored LEDs. LEDs are widely used in various applications such as in cars, bikes, home appliances, offices, lighting, mobiles, televisions, etc. This indicates whether the electronic device is working or not. In electronic circuits, the LED is a type of PN-junction semiconductor diode, which can emit light when current flows through the circuit in the forward direction. The term LED stands for Light Emitting Diode.
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