{"id":5835,"date":"2023-07-14T16:59:55","date_gmt":"2023-07-14T14:59:55","guid":{"rendered":"https:\/\/www.pschatzmann.ch\/home\/?p=5835"},"modified":"2023-07-14T20:03:08","modified_gmt":"2023-07-14T18:03:08","slug":"arduino-uno-r4-bar-chart-on-the-led-matrix","status":"publish","type":"post","link":"https:\/\/www.pschatzmann.ch\/home\/2023\/07\/14\/arduino-uno-r4-bar-chart-on-the-led-matrix\/","title":{"rendered":"Arduino UNO R4 &#8211; Bar Charts on the LED Matrix"},"content":{"rendered":"<p>We can try to use a &#8220;Bar Chart&#8221; to display the result of FFT or the volume, so it is time to have a look at the built in LED Matrix. The basic API to update an LED is as follows:<\/p>\n<h3>The LED\u00a0API &#8211; Introduction<\/h3>\n<pre><code>#include \"Arduino_LED_Matrix.h\"\nArduinoLEDMatrix matrix;\nuint8_t frame[8][12] = {0};\n\nvoid setup(){\n  matrix.begin();\n  frame[7][0] = true; \/\/ acivate LED at 0,7 (left lower corner)\n  matrix.renderBitmap(frame, 8, 12);\n}\n\nvoid loop(){}\n<\/code><\/pre>\n<p>I have added some functionality on top of this, so the same thing can be done with<\/p>\n<pre><code>#include \"AudioTools.h\"\n#include \"AudioLibs\/LEDOutputUnoR4.h\"\nLEDOutputUnoR4 leds;\n\nvoid setup(){\n  leds.begin();\n  leds.ledXY(0,0) = true;\n  leds.display();\n}\n\nvoid loop(){}\n<\/code><\/pre>\n<p>As you can see, I transformed the 0 coordinates to the left lower corner, when we use the default configuration.<\/p>\n<p>A barchart can be drawn with the following commands:<\/p>\n<pre><code>#include \"AudioTools.h\"\n#include \"AudioLibs\/LEDOutputUnoR4.h\"\nLEDOutputUnoR4 leds;\n\nvoid setup(){\n  leds.begin();\n  for (int x=0;x&lt;12;x++){\n    leds.addColumnBar(random(7)+1);  \/\/ random number between 1 an 8\n    \/\/ leds.setColumnBar(x,random(7)+1); \/\/ gives the same result \n  }\n  leds.display();\n}\n\nvoid loop(){}\n\n<\/code><\/pre>\n<p>And a scrolling barchart is quite easy to implement:<\/p>\n<pre><code>#include \"AudioTools.h\"\n#include \"AudioLibs\/LEDOutputUnoR4.h\"\nLEDOutputUnoR4 leds;\n\nvoid setup(){\n  leds.begin();\n}\n\nvoid loop(){\n  leds.addColumnBar(random(7)+1);  \/\/ random number between 1 an 8\n  leds.display();\n  delay(1000);\n}\n\n<\/code><\/pre>\n<h3>Displaying the Volume on the LED Matrix<\/h3>\n<p>In one of my prior posts, I have demonstrated <a href=\"https:\/\/www.pschatzmann.ch\/home\/2023\/06\/30\/arduino-uno-r4-with-analog-microphone\/\">how to use a Analog Microphone with the UNO R4<\/a>. We can now easily extend the sketch to display the volume on the <strong>LED Matrix<\/strong>.<\/p>\n<pre><code>#include \"AudioTools.h\"\n#include \"AudioLibs\/LEDOutputUnoR4.h\"\n\nAudioInfo info(8000, 1, 16);\nAnalogAudioStream in; \/\/ mic input\nVolumeOutput out; \/\/ determin volume\nStreamCopy copier(out, in); \nLEDOutputUnoR4 leds;\nint count=0;\n\n\/\/ Arduino Setup\nvoid setup(void) {\n  Serial.begin(115200);\n  AudioLogger::instance().begin(Serial, AudioLogger::Info);\n  \/\/ start LEDs\n  leds.begin();\n  \/\/ start ADC\n  auto cfgRx = in.defaultConfig(RX_MODE);\n  cfgRx.copyFrom(info);\n  in.begin(cfgRx);\n\n  \/\/ open output\n  out.begin(info);\n}\n\n\/\/ Arduino loop - copy data \nvoid loop() {\n  copier.copy();\n  if (count++&gt;20){\n    count=0;\n    int vol_bars = map(out.volume(), 0, 1000, 0, 7);  \n    leds.addColumnBar(vol_bars);  \/\/ random number between 1 an 8\n    leds.display();\n  }  \n}\n<\/code><\/pre>\n<p>If we update the volume at every loop, it will run much too fast, so we slow the scrolling down with the help of the count variable: the bigger this variable, the slower the scrolling.<\/p>\n<p>We can see in my last post that the measured values are most below 1000, so we map the range from 0 to 1000 to 0 to 7 which is the max led height (=y pos);<\/p>\n<h3>The Final Sketch<\/h3>\n<p>This scenario is already built into the <a href=\"https:\/\/pschatzmann.github.io\/arduino-audio-tools\/classaudio__tools_1_1_l_e_d_output_uno_r4.html\">LEDOutputUnoR4 class<\/a>. Here is the final version:<\/p>\n<pre><code>#include \"AudioTools.h\"\n#include \"AudioLibs\/LEDOutputUnoR4.h\"\n\nAnalogAudioStream in; \nAudioInfo info(8000, 1, 16);\nVolumeOutput out;\nStreamCopy copier(out, in); \/\/ copy i2sStream to CsvOutput\nLEDOutputUnoR4 leds(out); \/\/ use VolumeOut scenario\n\n\/\/ Arduino Setup\nvoid setup(void) {\n  Serial.begin(115200);\n  AudioLogger::instance().begin(Serial, AudioLogger::Info);\n  \/\/ configure and start LEDs\n  auto ledc = leds.defaultConfig();\n  ledc.update_frequency = 20;\n  ledc.max_magnitude = 1000;\n  leds.begin(ledc);\n  \/\/ start ADC\n  auto cfgRx = in.defaultConfig(RX_MODE);\n  cfgRx.copyFrom(info);\n  in.begin(cfgRx);\n\n  \/\/ open output\n  out.begin(info);\n}\n\n\/\/ Arduino loop - copy data \nvoid loop() {\n  copier.copy();\n  leds.update();  \n}\n<\/code><\/pre>\n<p>Here you can also find some of <a href=\"https:\/\/www.pschatzmann.ch\/tag\/uno\/\">my other posts related to the Arduino Uno R4<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>We can try to use a &#8220;Bar Chart&#8221; to display the result of FFT or the volume, so it is time to have a look at the built in LED Matrix. The basic API to update an LED is as follows: The LED\u00a0API &#8211; Introduction #include &#8220;Arduino_LED_Matrix.h&#8221; ArduinoLEDMatrix matrix; uint8_t [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5728,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[20,22],"tags":[44],"class_list":["post-5835","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arduino","category-machine-sound","tag-uno"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Arduino UNO R4 - Bar Charts on the LED Matrix - Phil Schatzmann<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pschatzmann.ch\/home\/2023\/07\/14\/arduino-uno-r4-bar-chart-on-the-led-matrix\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Arduino UNO R4 - Bar Charts on the LED Matrix - Phil Schatzmann\" \/>\n<meta property=\"og:description\" content=\"We can try to use a &#8220;Bar Chart&#8221; to display the result of FFT or the volume, so it is time to have a look at the built in LED Matrix. 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