# markondej/fm_transmitter

Raspberry Pi as FM transmitter

Repository: https://github.com/markondej/fm_transmitter
Canonical: https://ross.abutalabs.com/products/fm_transmitter
Language: C++
License Family: other
Last push: 2026-06-12T21:50:40+00:00

## Health v2 (maintenance only)
Score: 62/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 87, release rhythm 8, longevity 100
- inputs: {"age_days": 4174, "days_push": 82, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1486, forks 305 (observed 2026-08-28T04:04:51.937512+00:00)

## What it is
A C++ command-line tool that turns a Raspberry Pi (up to Pi 4) into an FM radio transmitter by modulating the GPIO clock output. It broadcasts WAV audio files on a chosen FM frequency using a wire antenna attached to GPIO4.

## Use cases
- broadcast audio over FM from a raspberry pi
- turn raspberry pi into fm transmitter
- play wav files over fm radio
- stream system audio to an fm receiver
- build a small fm radio station with a pi
- transmit audio wirelessly without bluetooth hardware

## When to choose
- you have a Raspberry Pi 1-4 and want cheap FM broadcasting with just an antenna wire
- you want a lightweight C++ tool with no external radio hardware
- you need to pipe arbitrary system audio (e.g. via ALSA loopback) to an FM receiver

## When to avoid
- you use a Raspberry Pi 5, which has a different peripheral chip
- you need licensed, legal, or high-power FM broadcasting
- you need stereo, high-fidelity, or long-range transmission
- you need a cross-platform solution beyond bare-metal Linux on the Pi

## Facets
- artifact type: cli-tool
- maturity: active
- function: audio-processing, embedded, developer-tools
- domain: embedded-systems, hardware
- platform: embedded, cli, iot
- tags: raspberry-pi, fm-radio, fm-transmitter, gpio, dma, wav-playback, broadcasting, hardware-hacking, audio, automation, linux

## Member repositories
- markondej/fm_transmitter (main) score 62

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:51.937512+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:33:52.348372+00:00, confidence not recorded.
  - readme: https://github.com/markondej/fm_transmitter (fetched 2026-08-28T04:04:51.937512+00:00, sha 61ed4838a728)
- Data as of 2026-08-30T08:39:29.467469+00:00.