--- title: Mic Jammer Relies On Ultrasound | daily.dev description: A hardware project using an RP2040 microcontroller and an array of 20-80 ultrasonic transducers to jam phone microphones. The device emits ultrasonic PWM... canonical: https://daily.dev/posts/mic-jammer-relies-on-ultrasound-fodpwperj twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Mic Jammer Relies On Ultrasound | daily.dev og:description: A hardware project using an RP2040 microcontroller and an array of 20-80 ultrasonic transducers to jam phone microphones. The device emits ultrasonic PWM... og:url: https://daily.dev/posts/mic-jammer-relies-on-ultrasound-fodpwperj og:image: https://api.daily.dev/og/posts/fOdpwpErj.png og:image:alt: Mic Jammer Relies On Ultrasound og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Mic Jammer Relies On Ultrasound **[Hackaday](https://daily.dev/sources/hackaday)** · 2 min read · 0 upvotes · 0 comments ## Summary A hardware project using an RP2040 microcontroller and an array of 20-80 ultrasonic transducers to jam phone microphones. The device emits ultrasonic PWM signals specifically modulated to confuse automatic gain control systems in modern smartphones, rendering recorded audio unintelligible. The jammer is largely inaudible to humans and has been demonstrated to work against an iPhone 17. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Speech Jammer Gets Jammed Up](https://daily.dev/posts/speech-jammer-gets-jammed-up-86zck8fvx) · Hackaday · 1 upvotes · 0 comments - [UK seeks fresh perspectives to shape radio-jamming laws](https://daily.dev/posts/uk-seeks-fresh-perspectives-to-shape-radio-jamming-laws-yb56hneow) · The Register · 0 upvotes · 0 comments - [Accurately Aiming Audio With An Ultrasonic Array](https://daily.dev/posts/accurately-aiming-audio-with-an-ultrasonic-array-0tu40p8nk) · Hackaday · 0 upvotes · 0 comments - [This cool ESP32‑S3 project is like a Geiger counter but for finding your phone instead of radiation](https://daily.dev/posts/this-cool-esp32-s3-project-is-like-a-geiger-counter-but-for-finding-your-phone-instead-of-radiation-2n9m1mbi9) · XDA Developers · 0 upvotes · 0 comments - [Harmonic Radar Finds Hidden Electronics](https://daily.dev/posts/harmonic-radar-finds-hidden-electronics-wtpyaw1ca) · Hackaday · 0 upvotes · 0 comments --- Tags: [#privacy](https://daily.dev/tags/privacy), [#embedded](https://daily.dev/tags/embedded) [View this post on daily.dev](https://daily.dev/posts/mic-jammer-relies-on-ultrasound-fodpwperj) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Mic Jammer Relies On Ultrasound","url":"https://daily.dev/posts/mic-jammer-relies-on-ultrasound-fodpwperj","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/mic-jammer-relies-on-ultrasound-fodpwperj"},"datePublished":"2026-07-23T18:31:58.453Z","dateModified":"2026-07-23T19:57:01.107Z","description":"A hardware project using an RP2040 microcontroller and an array of 20-80 ultrasonic transducers to jam phone microphones. 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