MAX7219 can drive that also if the part is a common cathode display. Step 1: Components Required (1.) ARDUINO UNO (Or any Arduino UNO Clone) (2.) Common Anode RGB LED (3.) 3X220 Ohm Resistor (4.) 3X Diode (5.) Breadboardper Cables (6.) Jumper Cables Step 2: The Circuit Connect the Common Anode of the RGB LED to Digital Pin - 8 on the Arduino UNO. I have spent the past several months developing LED color control software that communicates over serial to an Arduino board, which then produces color in LEDs over three PWM pins (a fairly common setup). The red, green, and blue LEDs are then connected to pins 3, 5, and 6 using a 220 resistors in series to limit current, preventing the LEDs from being damaged. I have a question regarding the use of NPN transistors in an RGB LED (common anode) circuit connected to an Arduino Uno. The positive pin of the RGB LED connects to the VCC pin of the Arduino to provide power. Or perhaps you move into a 4-digit 7-segment display. The pins of a common anode RGB LED are shown by Figure 2. Note that common anode RGB LEDs and common cathode RGB LEDs are not the same! Make sure you get the right one for your project.īuy this Common Anode RGB LED from Amazon or Adafruit. One way is to move all the shift registers into a part like MAX7219, which can drive 8 common cathode digits. Because you will be driving the cathodes of the LEDs, remember that the software logic will be inverted – set the cathode pin HIGH to turn it OFF, and vice versa. You can also just hook it up and test to see which pin is which. In order to create ground for the leds I connected 3 rectifier diodes to R-, G- and B. Using 3 pnp transistors it inverts the R-, G- and B- to R+, G+ and B+. After a few tests I came up with the circuit below. The pin assignments will vary between manufacturers, so refer to the datasheet for your LED. Now that I have run out of common anode RGB leds I tried to come up with a solution to somehow connect common ground to common anode. Common anode RGB LEDs have 4 pins – 1 common anode (you generally connect this to your supply voltage) and 3 cathode pins for red, green, and blue (you generally connect each of these through a current limiting resistor to an Arduino pin). In the common cathode, RGB LED, the cathode of all the LEDs is common and common pin is connected to ground (GND) pin of Arduino and anodes (RGB terminals).
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