Lesson 7--Microduino “RGB LED”

Language	English

Objective You have learned several LED experiment, then go on studying the RGB LED that is display different color by a RGB LED, including the breathing lamp's effect. Equipment Microduino-Core Microduino-FT232R Other hardware equipment Breadboard Jumper one box Breadboard one piece RGB LED one 220Ω resistor one USB Data cable one RGB RGB LED contains three LEDs, one is red, the other is green and another it blue. By controlling three LED's brightness, you can mix up almost any color you want. Connection method Method 1: The longest lead wire (anode) will be connected to +5 V. The other three pins are connected the series resistance of 220Ω then connected to Microduino PWM output port. The resistance use to prevent too much current flows and burn the LED. Method 2: RGB anode through 220Ω resistor connect to Vcc, the other three pins connected to the PWM output port. Three LED share a resistance, then the brightness dimmed. Experimental schematic The following connection uses method 1 and uses D5,D6,D11. Program int redPin = 11; int greenPin = 5; int bluePin = 6; void setup() { 　 pinMode(redPin, OUTPUT); 　 pinMode(greenPin, OUTPUT); 　 pinMode(bluePin, OUTPUT); } void loop() { 　　setColor(255, 0, 0); // Red 　　delay(1000); 　　setColor(0, 255, 0); // Green 　　delay(1000); 　　setColor(0, 0, 255); // Blue 　　delay(1000); 　　setColor(255, 255, 0); // Yellow 　　delay(1000); 　　setColor(80, 0, 80); // Purple 　　delay(1000); 　　setColor(255, 255, 255);// White 　　delay(1000); 　　setColor(0, 0, 0); //Black 　　delay(1000); 　　for(int i=0;i<255;i+=5)//Red coming on 　　{ 　　　 setColor(i, 0, 0); 　　　 delay(30); 　　} 　　delay(100); 　　for(int i=255;i>0;i-=5)//Red coming off 　　{ 　　　 setColor(i, 0, 0); 　　　 delay(30); 　　} 　　delay(100); 　　for(int i=0;i<255;i+=5)//Blue coming on 　 { 　　　 setColor(0, i, 0); 　　　 delay(30); 　　} 　　delay(100); 　　for(int i=255;i>0;i-=5)//Blue coming off 　　{ 　　　 setColor(0, i, 0); 　　　 delay(30); 　　} 　　delay(100); 　　for(int i=0;i<255;i+=5)//Green coming on 　　{ 　　　 setColor(0, 0, i); 　　　 delay(30); 　　} 　　delay(100); 　　for(int i=255;i>0;i-=5)//Green coming off 　　{ 　　　 setColor(0, 0, i); 　　　 delay(30); 　　} 　　delay(100); } void setColor(int red, int green, int blue)//Color display program { 　　analogWrite(redPin, 255-red); //A total of anode RGB, low level light red LED 　　analogWrite(greenPin, 255-green); 　　analogWrite(bluePin, 255-blue); } Program custom setColor function and invoked in loop directly which make the program looks clean and clear. Here just list a few kinds of color, you can get color value through other colors modulus software, such as PhotoShop. Result In a light can be seen on red, green, blue, yellow, purple, black, white, and effect like a breathing lamp . Video