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FM Transmitter with Arduino \u0026 Si4713\n#### Author: Bocaletto Luca\n\nA professional Arduino UNO project using the SparkFun Si4713 breakout to broadcast line-level audio over FM (87.5 – 108 MHz), complete with RDS support.\n\n## Bill of Materials\n- Arduino UNO (5 V)  \n- Si4713 FM transmitter breakout (SparkFun or equivalent)  \n- LM386 audio amplifier (for mic or line input)  \n- 3.5 mm audio jack (IN+ and IN–)  \n- 17 cm wire antenna  \n- LED + 220 Ω resistor (status indicator)  \n- Push-button (mute/unmute)  \n- Jumper wires \u0026 breadboard  \n- USB cable  \n\n## Wiring Diagram\n\n        Arduino UNO         Si4713 Breakout        LM386 Amp         Audio Jack         Antenna\n        ─────────────────────────────────────────────────────────────────────────────────────\n        5V    ─► VIN       SDA ─► A4            IN+ ─► AUDIO_IN   Tip  ─► Left Channel   ─► wire\n        GND   ─► GND       SCL ─► A5            IN– ─► AUDIO_IN   Ring ─► Right Channel  ─► GND\n        ANT   ─► ANT       OUT ─► LM386_OUT  Sleeve (ground)\n        Button ─► D2 (INPUT_PULLUP, press to GND)\n        LED    ─► D6 (via 220 Ω resistor to GND)\n\n## Usage\n\n1. Install the **SparkFunSi4713** library via Arduino Library Manager.  \n2. Open **Serial Monitor** at `115200` baud.  \n3. Send commands:\n\n        F \u003cMHz\u003e  — set frequency (e.g. `F 99.7`)\n        V \u003c0–63\u003e — set volume level\n        P \u003cPS\u003e   — set 8-char RDS Program Service name\n        T \u003cRT\u003e   — set RDS Radio Text (max 64 chars)\n        S        — show current settings\n\n4. Feed audio into the LM386 amplifier.  \n5. Tune your FM receiver to the chosen frequency.\n\n\u003e **Note:** Always check local regulations before transmitting on FM band.  \n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fbocaletto-luca%2Ffm-trasmitter","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fbocaletto-luca%2Ffm-trasmitter","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fbocaletto-luca%2Ffm-trasmitter/lists"}