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Introduction Are you looking to add a lot of color to your project? These massive RGB LED panels are an awesome place to start. You can create animations, games, or all sorts of other fun displays with them. Depending on the manufacturer, these panels can come in different sizes, LED pitch, and scan rates. A 16x32 RGB LED panel to the left, and a 32x32 panel to the right. These panels really stretch the Arduino to its limits. If you have an you may want to whip that out instead. Any size higher than a 32x32 panel requires an Arduino Mega 2560 or faster microcontroller. A simple does work, at least in the short run, but you may want to step up to a higher capacity supply, like the or wall adapter. The panel includes a 4-pin polarized connector and spade-terminated cable for its power supply. Check out the next page for help finding a power source and cable. Suggested Reading Before following along with this tutorial, we recommend reading through these tutorials first: Warning! Don't use the 5V supply from your Arduino. Those are only spec'ed to supply about 800mA, and the Arduino's already eating into that capacity a bit. These panels require a regulated 3. And that supply needs to be able to source a good amount of current — up to 2A in the worst case all pixels bright, hot, white. For a 32x64, one of these panels was pulling about ~3. A 4-pin 2 for VCC, 2 for GND , 0. Depending on the manufacturer, the color and location of the power connector may be different. Power Cable Included with the panel is a dedicated cable for power. The included cable is terminated with both a female polarized connector, and a pair of spade terminals. The ingredients for our power supply and cable. To begin, we snipped the spade connectors off of the panel power supply cable. And then the newly unterminated ends. Do the same for the black wires make sure you use the black wire next to the red on the Molex pigtail. Make sure you are connecting to the 5V and GND pins and NOT the 12V pin. Before connecting to the RGB Matrix Panel,. Spliced Wires Finally, cover the splice with or , and voila! Finished panel power supply cable. This is a nice, sturdy interface between the panel and a solid power supply. Long-Term: Mean Well Switching Power Supply For those that want to push the panels to the limit i. Short-Term: Barrel Jack Grab a 5V wall adapter. Both been tested to work with the panels as well. At least in the short term. The final connection should look like the image below. The RGB panels have a pair of 16-pin 2x8 IDC connectors, and we need to wire up to most of those pins. Conveniently, both panels have the connector pins labeled the unlabeled pins are ground. The labeling may be slightly different depending on the manufacturer. Connector labels on a 32x32 panel. The wiring will be the same for both cases by connecting to the connector on the left. Hookup Table Here are the pin connections between LED panel connector and Arduino: Panel Pin Label Cable Connector Pin Arduino Uno Atmega328P Pin Arduino Mega 2560 Pin Notes R0 1 2 24 Red Data columns 1-16 G0 2 3 25 Green Data columns 1-16 B0 3 4 26 Blue Data columns 1-16 GND 4 GND Ground R1 5 5 27 Red Data columns 17-32 G1 6 6 28 Green Data columns 17-32 B1 7 7 29 Blue Data columns 17-32 GND 8 GND Ground A 9 A0 Demux Input A0 B 10 A1 Demux Input A1 C 11 A2 Demux Input A2 D 12 A3 Demux Input E1, E3 32x32 panels only CLK 13 11 LED Drivers' Clock STB 14 10 LED Drivers' Latch OE 15 9 LED Drivers' Output Enable GND 16 GND Ground For a more step-by-step approach, follow along below. We use to wire between the included ribbon cable and our Arduino. For reference when wiring the pins, try looking down at the IDC connector with red wire on top. Also, note that the tab for polarity is on the right side on either end of the cable. The pin holes on the left will be even numbered. Depending on the manufacturer, you may have received a black connector instead of a grey. Once you decide what side to connect, start wiring pin 1 by connecting a red wire for R0. Then connect pin 2 by connecting a green wire for G0. After connecting pin 3 using a blue wire for B0, continue wiring the pins based on the hookup table. To help keep track of what side you are connecting to, feel free to label your connections with a marker. Connecting the Clock Pin This is the last pin that has some restriction on where it can go — it must be connected to one of Arduino's port B pins. That means it must be either 8, 9, 10, 11, 12, or 13. The example code has it defined as pin 11 in the hookup table. Make sure to check your pin definition for the clock as it may vary with the code you are using. OE connects to pin 9. STB to pin 10. Feel free to swap those up if your application requires. Just make sure you switch it up in the example code too. There are three unlabeled pins on the connector which should all be tied to ground. Otherwise, the panels will not be able to display as expected due to the limitations of the library and the Arduino Uno. To daisy chain two 32x32 RGB matrices together, connect another IDC cable from the output of the first panel to the input of the second panel. Then connect the second 4-pin polarized connector to the input power connector. When daisy chaining the RGB LED matix panels, make sure that they have the same scan rate! When using an array higher than 32x64, another library would be a better option with a Teensy 3. You may need to level shift to convert 3. For more information, check out the links in the. Custom Shield Adapter If you have a prototyping shield, try making a custom shield adapter for a more secure connection. Follow the steps outlined above but the connection together. Magnetic Mounts Depending on the supplier, you may receive a set of magnetic mounts. Add it to the panel's mounting holes to stick on a fridge or metal wall! They also work great as a standoff. Just make sure to secure and insulate your wires to prevent any shorts if there is metal behind the panel. Compatibility: The 16x32 works at a 1:8 scan rate. The 32x32 and 32x64 examples work with a 1:16 scan rate. Depending on the manufacturer, there may be different scan rates for the the LED Matrix Panels. Using different scan rates with the example code may cause unexpected behaviors. You can obtain these libraries through the Arduino Library Manager by searching for those names. For your convenience, we packaged those libraries with the serial paint example code used in the tutorial: Library Examples The RGBMatrixPanel library includes a number of fun examples to help show how the library can be used. Make sure to adjust the code based on your hardware hookup. In this tutorial, we physically connected the clock pin to 11. What we came up with is a serial-controlled paint program. With this sketch, you can use the serial monitor or, better yet, to control a cursor and draw on the matrix. Download and unzip the sketch included in the zipped libraries using the link below if you have not already. Once you have adjusted the code to your screen, upload it to the Arduino! After upload, a single pixel should be blinking at the top left of the panel. Using the Sketch To control the program, open up your serial terminal to 9600 bps. You can send E uppercase to erase the screen. The idea of this sketch is: move the cursor around to draw pixels, shapes, or text. Then move cursor to endpoint and press v again. Then move your cursor to where you want the diagonal corner. Then press either x for an empty box, or X for a filled box. Then move your cursor to where you want the outside edge of your circle to be. Then press c for an empty circle or C for a filled circle. Now any characters received will be displayed on the panel. You can copy this, and put it back in your sketch if you want to load it again. The sketch includes a demo array, which was created from the print command. Follow this example to load your own drawings! Give the paint sketch a try! See if you can make the next great LED Panel picture. If you make something neat, share it with us! I drew that SFE flame one pixel at a time! Here are our creations: A drawing on the 16x32 panel. An example drawing on the 32x32 panel. Try modifying the code to change the color and move around the matrix using potentiometers and buttons. You can see it in action in our : Resources and Going Further Now that you know how to make use of these beautiful RGB LED matrices, what nifty project are you going to create with them?

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