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Commit 4af59ff

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Merge pull request #1259 from arduino/sync/Hannes7eicher/LedMatrix-example
[MKC-1062] add live preview sketch
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‎content/hardware/02.hero/boards/uno-r4-wifi/tutorials/led-matrix/led-matrix.md‎

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## Animation Generation
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We have developed a tool that is used to generate frames and animations to be rendered on the LED Matrix in your browser. This tool is part of [Arduino labs](https://labs.arduino.cc), and is therefore considered experimental software.
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[Click here](https://ledmatrix-editor.arduino.cc) to go to the LED Matrix tool.
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To use the tool you need to upload the following sketch, allowing the board to read serial inputs send by the browser.
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You can also find the sketch in **File > Examples > LED_Matrix > LivePreview**
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![LED Matrix Editor](./assets/led-matrix-editor.png)
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```arduino
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#include "Arduino_LED_Matrix.h"
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ArduinoLEDMatrix matrix;
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void setup() {
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Serial.begin(115200);
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matrix.begin();
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}
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uint32_t frame[] = {
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0, 0, 0, 0xFFFF
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};
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void loop() {
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if(Serial.available() >= 12){
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frame[0] = Serial.read() | Serial.read() << 8 | Serial.read() << 16 | Serial.read() << 24;
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frame[1] = Serial.read() | Serial.read() << 8 | Serial.read() << 16 | Serial.read() << 24;
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frame[2] = Serial.read() | Serial.read() << 8 | Serial.read() << 16 | Serial.read() << 24;
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matrix.loadFrame(frame);
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}
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}
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```
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[Click here](https://ledmatrix-editor.arduino.cc) to go to the LED Matrix tool.
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![LED Matrix Editor](./assets/led-matrix-tool.png)
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Once you've made your animations, you can export them from the tool in the format that lets you use them like [previously discussed](#how-to-write-a-frame).
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