{"id":2385,"date":"2021-01-07T10:03:12","date_gmt":"2021-01-07T09:03:12","guid":{"rendered":"https:\/\/www.pschatzmann.ch\/home\/?p=2385"},"modified":"2021-12-14T15:16:16","modified_gmt":"2021-12-14T14:16:16","slug":"back-to-basics-radio-player-with-a-piezo-electric-element","status":"publish","type":"post","link":"https:\/\/www.pschatzmann.ch\/home\/2021\/01\/07\/back-to-basics-radio-player-with-a-piezo-electric-element\/","title":{"rendered":"Back to Basics &#8211; A ESP32 Radio Player using Piezo Electric Elements"},"content":{"rendered":"<p>In one of <a href=\"https:\/\/www.pschatzmann.ch\/home\/2020\/03\/19\/sound-from-a-esp32-microcontroller\/\">my last year&#8217;s posts<\/a> I was describing how to build an Internet Radio using an ESP32. I was using this together with an <strong>external DAC<\/strong> to feed an <strong>Amplifier<\/strong>.<\/p>\n<p>Lately I got some really cheap <strong>Piezo Electric Elements<\/strong> and I was wondering if I could use the solution w\/o any additional Audio Electronics Hardware by just using the <strong>built in DAC<\/strong> of the ESP32 and connecting the 2 output pins to the Piezo Elements.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.pschatzmann.ch\/wp-content\/uploads\/2021\/01\/piezo.jpeg\" alt=\"\" width=\"193\" height=\"250\" class=\"alignnone size-full wp-image-2386\" \/><\/p>\n<p>To my surprise <strong>this works pretty well<\/strong>. It&#8217;s just necessary to use some additional &#8216;surface&#8217; to amplify the sound: Some scrap plastic packaging containers are doing just a great job.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.pschatzmann.ch\/wp-content\/uploads\/2021\/01\/speaker-225x300.jpg\" alt=\"\" width=\"225\" height=\"300\" class=\"alignnone size-medium wp-image-2397\" srcset=\"https:\/\/www.pschatzmann.ch\/wp-content\/uploads\/2021\/01\/speaker-225x300.jpg 225w, https:\/\/www.pschatzmann.ch\/wp-content\/uploads\/2021\/01\/speaker.jpg 596w\" sizes=\"auto, (max-width: 225px) 100vw, 225px\" \/><\/p>\n<p>There are no changes to my original sketch:<\/p>\n<pre><code>#include \"AudioFileSourceICYStream.h\"\n#include \"AudioGeneratorMP3.h\"\n#include \"AudioOutputI2SNoDAC.h\"\n#include \"WiFi.h\"\n\n\/\/ Enter your WiFi setup here:\nconst char *SSID = \"mySSID\";\nconst char *PASSWORD = \"pwd\";\n\n\/\/ Randomly picked URL\nconst char *URL = \"http:\/\/strm112.1.fm\/blues_mobile_mp3\";\n\nAudioGenerator *audio;\nAudioFileSourceHTTPStream *file;\nAudioOutputI2S *out;\n\nvoid setup() {\n    Serial.begin(115200);\n    delay(1000);\n\n    WiFi.disconnect();\n    WiFi.mode(WIFI_STA);\n    WiFi.begin(SSID, PASSWORD);\n\n    \/\/ Try to connect to Wifi forever\n    while (WiFi.status() != WL_CONNECTED) {\n        Serial.println(\"...Connecting to WiFi\");\n        delay(1000);\n    }\n    Serial.println(\"Connected\");\n\n    audioLogger = &amp;Serial;\n    file = new AudioFileSourceICYStream(URL);\n    file-&gt;SetReconnect(5, 0);\n    out = new AudioOutputI2S(0, 1); \/\/ (0,1) is using the internal DAC\n    audio = new AudioGeneratorMP3();\n    audio-&gt;begin(file, out);\n}\n\nvoid loop() {\n    if (audio-&gt;isRunning()) {\n        audio-&gt;loop();\n    }\n}\n<\/code><\/pre>\n<p>The wiring is pretty simple:<\/p>\n<table>\n<thead>\n<tr>\n<th>Pin<\/th>\n<th>Piezo<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>GPIO25<\/td>\n<td>Red Cable<\/td>\n<\/tr>\n<tr>\n<td>GND<\/td>\n<td>Black Cable<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Optionally you can connect a second element to GPIO26.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In one of my last year&#8217;s posts I was describing how to build an Internet Radio using an ESP32. I was using this together with an external DAC to feed an Amplifier. Lately I got some really cheap Piezo Electric Elements and I was wondering if I could use the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2386,"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":[22],"tags":[30],"class_list":["post-2385","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-machine-sound","tag-back-to-basics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Back to Basics - A ESP32 Radio Player using Piezo Electric Elements - 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\/2021\/01\/07\/back-to-basics-radio-player-with-a-piezo-electric-element\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Back to Basics - A ESP32 Radio Player using Piezo Electric Elements - Phil Schatzmann\" \/>\n<meta property=\"og:description\" content=\"In one of my last year&#8217;s posts I was describing how to build an Internet Radio using an ESP32. 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