In firmware, configure the GPIO as input and trigger on rising/falling edge depending on magnet polarity and wiring.
The is a highly popular, ultra-compact, and cost-effective Bluetooth 5.0 audio receiver module . It is widely used by electronics hobbyists, hardware engineers, and DIY audiophiles to add wireless stereo capabilities to wired speakers, vintage amplifiers, and car audio systems. vhm 314 datasheet free
| Feature | Specification | | :--- | :--- | | | VHM-314 | | Primary Function | Bluetooth Audio Receiver & MP3 Decoder | | Bluetooth Version | 4.1 / 5.0 (varies by version) | | Supported Protocols | A2DP, AVCTP, AVDTP, AVRCP, HFP | | Power Supply (VCC) | 3.7V - 5V DC | | Power Interface | Micro USB or Direct Solder Pads | | Audio Output | 3.5mm Stereo Jack and L/R Solder Pads | | Signal-to-Noise Ratio (SNR) | 90 dB | | Total Harmonic Distortion (THD+N) | -70 dB | | Supported Audio Formats | MP3, WAV, APE, FLAC | | Wireless Range (LOS) | > 15 meters (approx. 50 feet) | | Dimensions (approx.) | 30mm x 30mm (1.2" x 1.2") | | Default Pairing Password | 1688 (for Bluetooth 4.1 versions) | In firmware, configure the GPIO as input and
Often adds physical control buttons (Play/Pause, Vol+/-, Next/Prev), a DIP switch for power selection, and sometimes a charging circuit for lithium batteries. Pinout and Interface Details | Feature | Specification | | :--- |
The hardware interface is laid out symmetrically on a 3x3 cm PCB to allow either plug-and-play operation or permanent soldering into custom enclosures.
VHM-314 Datasheet: Comprehensive Guide to the 5.0 Bluetooth Audio Receiver Module