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FM transmitter circuit

Overview

Introduction to the principle of smart phone FM transmitter:
The smart phone FM transmitter realizes the communication between the microcontroller R7F0C807 and the smart phone APP through the 3.5mm standard audio interface, and controls the FM chip to transmit frequency modulation information through the I/O port (analog IIC), realizing the Car FM transmitter functional applications. With the rapid development of smart devices, related applications that use headphone jacks are becoming more and more widespread, such as smart TV remote controls, Lakala card swipers, etc.
Smartphone FM transmitter function introduction:
The smartphone FM transmitter APP is developed and designed based on Android 2.2. The smartphone FM transmitter demonstration board can be controlled through this Android APP. Press the start button, and the APP sends the Manchester code to the demo board through the left channel interface to complete the frequency band selection. The Manchester code sent from the demo board is continuously decoded through the microphone interface, and the battery power is displayed in real time. This APP has MP3 playback function.
Screenshot of the main control interface of the smartphone FM transmitter APP:

Smartphone FM transmitter circuit board and functions:

Smartphone FM transmitter hardware structure block diagram:

Design Files

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Update:2025-08-04 21:13:25

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