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You are here:Home » Arduino 3 Leg Bicolor LED Wiring and Code to Blink/Fade

By Abhishek Ghosh December 1, 2018 8:13 pm Updated on December 1, 2018

Arduino 3 Leg Bicolor LED Wiring and Code to Blink/Fade

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Bicolor LEDs are cheap and quite popular as indicators of various things. 3 leg Here is Arduino 3 leg bicolor LED wiring and code to blink or fade. LEDs have color specific resistor values.

A bicolor LED is practically two LEDs with one common anode or cathode. Some have common positive terminal (anode) and some have common negative terminal (cathode). When different voltage is applied to different LEDs, they make a mixture and produce several thousands of colors.

We commonly use which has middle terminal negative terminal and side terminals are for positive connection for green/red like lights. It is possible make beautiful christmas light with them with easy code. Now, regarding the resistor. We need a multimeter for the work. We need a source voltage which is around 30mA of 3V (or 2V if 0V is applied) with 0.5V variation.

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Here is datasheet of SMD bicolor LEDs (calculation will be closer) :

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https://www.kingbright-europe.de/wp-content/uploads/2013/08/KPB-2012SURKCGKCVer.2A.pdf

 

Arduino 3 Leg Bicolor LED Wiring and Code

 

Wiring is easy. You’ll connect the middle leg of the bicolor LED with GND of Arduino. Rest one leg of the bicolor LED will be attached with a 220 Ohm resistor (from rough calculation) and connected to some digital pin of Arduino. The last and third leg of the bicolor LED also will be attached with a 220 Ohm resistor (from rough calculation) and connected to another digital pin of Arduino. So, unlike the 2 leg LEDs, you will have 2 pins to code for. You have to adust the resistor values for correct and equal amount of light from both of them (otherwise one color will appear to be dull, dim). There are also modules available for the bicolor LEDs. Wiring will be simillar like just bare bicolor LED :

Arduino 3 Leg Bicolor LED Wiring and Code

Here is code :

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// led1 and led2 are two legs of bicolor led
int led1 = 13;
int led2 = 12;  
void setup() {          
  pinMode(led1, OUTPUT);  
  pinMode(led2, OUTPUT);    
}  
void loop() {  
  digitalWrite(led2, HIGH);
  delay(2000);          
  digitalWrite(led2, LOW);    
  delay(2000);      
  digitalWrite(led1, HIGH);  
  delay(2000);          
  digitalWrite(led1, LOW);  
  delay(2000);    
  digitalWrite(led1, HIGH);
  digitalWrite(led2, HIGH);
  delay(2000);  
  digitalWrite(led1, LOW);  
  digitalWrite(led2, LOW);  
  delay(2000);  
}  

Tagged With bicolor led programming arduino , wiring 3 leg leds to 12 volts , bicolor led arduino , bi color led fade arduino , arduione bicolor led , arduino led bicolor common anode , arduino codes for bicolor amber green , arduino and three lead bicolor led , arduino and bicolor led , arduino 3 leg led
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Abhishek Ghosh

About Abhishek Ghosh

Abhishek Ghosh is a Businessman, Surgeon, Author and Blogger. You can keep touch with him on Twitter - @AbhishekCTRL.

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