{"id":7204,"date":"2026-10-29T15:58:08","date_gmt":"2026-10-29T14:58:08","guid":{"rendered":"https:\/\/www.pschatzmann.ch\/home\/?p=7204"},"modified":"2026-10-29T16:05:09","modified_gmt":"2026-10-29T15:05:09","slug":"tinymodem-sending-data-through-sound-with-an-esp32-or-a-raspberry-pi-pico","status":"publish","type":"post","link":"https:\/\/www.pschatzmann.ch\/home\/2026\/10\/29\/tinymodem-sending-data-through-sound-with-an-esp32-or-a-raspberry-pi-pico\/","title":{"rendered":"TinyModem: Sending Data Through Sound with an ESP32 or a Raspberry Pi Pico"},"content":{"rendered":"<p>Remember the screeching of the dial-up modem? Turning data into sound is still one of the simplest ways to connect devices: you can use an audio cable, send it from a speaker to a microphone, put it on a telephone line or a radio, or just store it in a WAV file. No Wi-Fi, no pairing, no extra hardware.<\/p>\n<p><a href=\"https:\/\/github.com\/pschatzmann\/TinyModem\">TinyModem<\/a> is a header-only C++ library of software audio modems for Arduino and the desktop. It is based on the <a href=\"https:\/\/github.com\/pschatzmann\/arduino-audio-tools\">arduino-audio-tools<\/a>, so any audio input and output works: an I2S codec, a built-in DAC or ADC, PWM or a sound card.<\/p>\n<h2 id=\"one-library-ten-modem-types\">One library, ten modem types<\/h2>\n<ul>\n<li><strong>FSK<\/strong>: the classic one, compatible with minimodem (Bell 202\/103, RTTY, caller ID, &#8230;)<\/li>\n<li><strong>MFSK<\/strong>: many tones, robust over a speaker and a microphone<\/li>\n<li><strong>PSK<\/strong>: PSK31 and friends, now also QPSK and 8PSK<\/li>\n<li><strong>OFDM<\/strong>: the fast one for a cable or a good audio path<\/li>\n<li><strong>AX.25<\/strong>: APRS and packet radio, now also FX.25 and IL2P with Reed-Solomon error correction, compatible with direwolf<\/li>\n<li><strong>ggwave<\/strong>: exchange short messages with phones and browsers<\/li>\n<li><strong>Olivia \/ Contestia<\/strong>: keyboard chat with extremely weak signals<\/li>\n<li><strong>CSS<\/strong>: LoRa-like chirp spread spectrum<\/li>\n<li><strong>Morse code<\/strong>: International and American (railroad) Morse<\/li>\n<li><strong>DTMF<\/strong>: telephone touch tones<\/li>\n<\/ul>\n<p>Olivia, CSS, Morse, DTMF, QPSK\/8PSK, FX.25 and IL2P are new in version 1.2.0.<\/p>\n<h2 id=\"as-simple-as-a-serial-port\">As simple as a Serial port<\/h2>\n<p>A modem is just an Arduino stream: you print your data and read what was received, like with a Serial port. Switching to a different modem type takes a one-line change, so you can easily try out which one works best for your audio path.<\/p>\n<h2 id=\"fast-enough-for-small-boards\">Fast enough for small boards<\/h2>\n<p>Most modes run many times faster than real time: an ESP32-S3 decodes Morse 130 times and PSK125 almost 60 times faster than real time, and even the RP2040 without a floating point unit handles most modes. On the desktop, the <code>tinymodem<\/code> command line tool encodes and decodes WAV files or your sound card.<\/p>\n<h2 id=\"try-it\">Try it<\/h2>\n<p>Everything you need is on GitHub: the library, examples, the command line tool and a wiki that compares the modem types and tells you which one to choose for your project.<\/p>\n<p>\ud83d\udc49 <strong><a href=\"https:\/\/github.com\/pschatzmann\/TinyModem\">github.com\/pschatzmann\/TinyModem<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Remember the screeching of the dial-up modem? Turning data into sound is still one of the simplest ways to connect devices: you can use an audio cable, send it from a speaker to a microphone, put it on a telephone line or a radio, or just store it in a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7205,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","_exactmetrics_skip_tracking":false,"footnotes":""},"categories":[20,22],"tags":[],"class_list":["post-7204","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arduino","category-machine-sound"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>TinyModem: Sending Data Through Sound with an ESP32 or a Raspberry Pi Pico - 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\/2026\/10\/29\/tinymodem-sending-data-through-sound-with-an-esp32-or-a-raspberry-pi-pico\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"TinyModem: Sending Data Through Sound with an ESP32 or a Raspberry Pi Pico - Phil Schatzmann\" \/>\n<meta property=\"og:description\" content=\"Remember the screeching of the dial-up modem? 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