RGB LED is three LEDs of different colors (Red - red, Green - green, Blue - blue), enclosed in one housing. Let's see how to connect RGB LED to Arduino.
It is necessary
- - Arduino;
- - RGB LED;
- - 3 resistors for 220 Ohm;
- - connecting wires;
- - bread board;
- - a computer.
Instructions
Step 1
RGB LEDs are of two types: with a common anode ("plus") and a common cathode ("minus"). The figure shows the schematic diagrams of these two types of LEDs. The long leg of the LED is always the common power lead. The red LED lead (R) is located separately, green (G) and blue (B) are located on the other side of the anode, as shown in the figure. In this article, we will look at connecting an RGB LED with both a common anode and a common cathode.
Step 2
The connection diagram for an RGB LED with a common anode is shown in the figure. We connect the anode to "+5 V" on the Arduino board, the other three pins to arbitrary digital pins.
Please note that we are connecting each of the LEDs through its own resistor, and not using one common one. It is advisable to do just that, because each of the LEDs has its own efficiency. And if you connect them all through one resistor, the LEDs will glow with different brightness.
Step 3
Let's rewrite the classic "blink" sketch. We will enable and disable each of the three colors in turn. Note that the LED will light up when we apply LOW to the corresponding pin of the Arduino.
Step 4
Let's see the flashing RGB LEDs in action. The LED turns on in turn red, green and blue. Each color lights up for 1 second, then goes out for 2 seconds, and the next one turns on.
You can light each channel separately, you can all at the same time, then the color of the glow will change.
Step 5
If you are using a common cathode RGB LED, then connect the long lead of the LED to the GND of the Arduino board, and the R, G and B channels to the digital ports of the Arduino. It should be remembered that the LEDs light up when a high level (HIGH) is applied to channels R, G, B, in contrast to the LED with a common anode.
If you do not change the above sketch, then each LED color in this case will be on for 2 seconds, and the pause between them will be 1 second.
