Go to product viewer dialog for this item. is a popular, ultra-compact Bluetooth audio receiver module frequently used in DIY speaker projects. It comes in several versions, with newer "Blackboard" models typically featuring Bluetooth 5.0 and Type-C or Micro-USB power inputs. Technical Specifications Specification Bluetooth Version 5.0 (supports 4.1/4.2) Operating Voltage 3.7V to 5V DC Signal-to-Noise Ratio (SNR) THD + Noise ≤0.1% or −70 dB Frequency Response 20Hz – 20kHz Transmission Distance Up to 15m (open space) Audio Decoding MP3, WAV, FLAC, APE (Lossless) Power Consumption ~20mA (active), <5mA (standby) Interface and Features
Dual Power Inputs: Can be powered via a USB interface (Micro-USB or Type-C) or through dedicated solder pads for a 3.7V Lithium battery.
Audio Output: Includes a standard 3.5mm stereo jack for direct headphone use and L/R/G solder pads for connecting to an external amplifier.
Status Indicator: An onboard blue LED indicates pairing status.
Silent Operation: Known for using subtle tones rather than loud voice prompts for connection status. Wiring Overview
Power: Use the Micro-USB Port for 5V power or the BAT+ and BAT- pads for a lithium battery.
Audio: Connect the 3.5mm jack directly to speakers/headphones or use the L/G/R pads to wire into an audio amplifier module like the TPA3116D2. VHM-314 Bluetooth Audio Receiver Board Module
How to use it in a project
- Wiring: Connect VCC to 3.3 V or 5 V, GND to ground, and the OUT pin to a microcontroller input. If the device is open-drain, add a pull-up resistor (10 kΩ typical).
- Magnet selection: Use a small neodymium magnet; stronger magnets permit greater sensing distances. Test with the actual magnet and orientation — Hall sensors are polarity-sensitive (North vs. South).
- Debounce and filtering: In software, add a short debounce (5–20 ms) or require N consistent reads to avoid chatter when the magnet is near the switching threshold.
- Mounting: Place the sensor close to the magnet’s path; mechanical alignment matters — slight offsets can change switching distance.
- Safety margins: Keep the magnet a bit further or nearer than the threshold as required for fail-safe behavior; design for worst-case operating temperature where sensitivity can shift.
Unlocking the VHM 314: Your Ultimate Guide to a Free Datasheet Download
In the world of industrial electronics, precision is paramount. Whether you are an embedded systems engineer, a procurement specialist, or a hobbyist working on a motor control project, having immediate access to a component’s datasheet is non-negotiable. One part number that frequently surfaces in technical forums and BOMs (Bill of Materials) is the VHM 314.
If you have been frantically typing “VHM 314 datasheet free” into search engines, you likely need electrical characteristics, pinout configurations, or thermal data—fast. This article serves as your complete resource. We will explore what the VHM 314 is, where to find a legitimate free datasheet, and how to interpret its critical specifications.
Method 3: Octopart or Mouser
Component search engines like Octopart often host manufacturer datasheets without requiring registration. Search for the VHM 314, click on the part number, and select "Datasheet PDF." This is often the fastest route to a clean, free download.
2. Output Type
Is it Ratiometric or Fixed?
- Ratiometric: Output voltage is proportional to both the magnetic field AND the supply voltage.
- Fixed: Output is absolute, regardless of minor Vcc changes. The datasheet reveals this instantly. Most VHM 314 sensors are ratiometric, making them ideal for unregulated power supplies.
