![]() Here I have modified this code to fade the RGB LED and change its color. Common Cathode displays have all the LED cathodes connected together and need a driver with outputs that become high to turn each segment on. Below code is adapted from the Example you will find in Arduino IDE “Fading”. Common Anode displays have all the LED Anodes connected together and need a display driver with outputs which become low to turn each segment on. I have used my Arduino Uno to drive a common Cathode RGB LED where I have connected R, G and B pins to pin 3, 9 and 10 to drive the LED with PWM signal. Also another use for PWM is in Audio Amplifiers. Also it can be used to control the amount of power delivered to a load without losses that would result in a linear power delivery. PWM is also widely used in controlling DC Motors speed as well. All we need to do is generate a precise PWM signal to drive this LED module and produce the desired color and effect. This types of LEDs has already embedded most of the times the limiting resistors that they need in order to operate. This only takes one pin and can operate more than one LED’s using that. So let’s get into another type of RGB LED’s which is addressable. LEDs we have seen above will take three pins from Microcontroller which might be not be possible in all cases. So when using RGB LED’s in our project, for common cathode we connect the longest pin to ground and for common anode we connect the longest pin of the RGB LED in our Vcc source voltage. ![]() And it is activated by sinking the current via a Microcontroller. In common Anode configuration LED’s are sourced by power supply such as Vcc. The main difference between Common Cathode and Common Anode configuration is how the LED’s are sourced. Here is the internal diagram of Common Anode RGB LED. Driving these three pins with PWM signal will produce different color as well as Fading effect. However when operated together we will get a different color apart from these three depends on the combination of these colors. We can activate these LED’s individually or together, when activating individually LED will emit either Red, Green or Blue. Where Red, Green and Blue LED’s are sourced individually using these three pins from a Microcontroller. The above given diagram shows the internal connection in common cathode RGB LED. In the following Schematics we can see the differences between them. These are common anode and common cathode LEDs. So I intend to write a simple tutorial on working with RGB LED’s with PWM signal using Arduino.įirst of all let’s dive into the types of RGB LEDs. RGB LED is one of my favorite thing to play with apart from the fact it is cool, RGB LED’s can give great possibilities and save tons of space in our project design.
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