First, we will start with the RGB LED Strip. Let us now take a step-by-step look into how to build the RGB LED Matrix. By using LED strip, you will get really good brightness of the screen. It is necessary to cut the LED strip into pieces, where every piece has 3 RGB LEDs and acts like one pixel. It’s based on serial communication with Arduino, but with logic of 3.3V, so it’s recommended to add two resistors, which acts like voltage divider, to adapt voltage levels.įor this project, we have used an RGB LED strip, like the one shown below with 30 LEDs per meter. This module is great for interesting projects controlled by android and it’s really easy to use. Function of this IC is to convert serial to parallel communication for getting more digital output pins, outputs are connected to transistors to drive RGB LEDs. In this project it’s used 4 this ICs which acts like one 32-bit-shift register. 74HC595Nħ4HC595N is 8-bit serial-in, serial or parallel-out shift register with output latches. It has 14 digital I/O and 8 analog pins of which 6 digital pins are used for this project and 1 analog pin is used for temperature reading. A lot of wires and materials like plywood and polystyrene sheetĪrduino nano is an ATmega Microcontroller based prototyping board. Each row is further consists of 3 cathode terminals for Red, Green and Blue LEDs. They are organized into 8 rows of Cathode terminals and 6 columns of anode terminals. The second image here shows the layout of the RGB LEDs. The first image shows the connections with respect to the shift registers, how the shift registers are connected to Arduino Nano, source transistors connected to the Columns (assuming Common Anode RGB LEDs) and sinking transistors connected to the Rows of R, G and B LEDs (Cathodes). This is circuit of RGB LED Matrix project. Create an APP for Android using MIT App Inventor 2.
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