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VHM-314 Bluetooth Audio Receiver Board Module

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Ekostra Electronics

On April 13, 2025

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VHM-314 Bluetooth Audio Receiver Board Module

High-fidelity stereo audio receiver with Bluetooth 5.0 and 3.5mm audio output

Introduction

The VHM-314 Bluetooth Audio Receiver is a compact, high-quality audio module that enables wireless audio streaming to any wired speaker system. Supporting the latest Bluetooth 5.0 standard, it delivers crystal-clear stereo sound with low latency and stable connectivity.

Key Features

📶 Bluetooth 5.0

Stable connection up to 15m range

🎵 High Quality Audio

Supports SBC, AAC codecs

🔋 Dual Power Options

5V DC or 3.7V lithium battery

🎧 Multiple Outputs

3.5mm stereo jack + line-out pins

⏱️ Low Latency

<40ms audio delay

🔊 Built-in Amplifier

Drives headphones directly

Technical Specifications

Bluetooth Version	5.0 (Class 2)
Wireless Range	Up to 15m (open space)
Audio Codecs	SBC, AAC
Frequency Response	20Hz-20kHz (±3dB)
Signal-to-Noise Ratio	≥85dB
Total Harmonic Distortion	<0.1% (1kHz)
Output Power	2×15mW (32Ω load)
Power Supply	3.7-5V DC (5V recommended)
Operating Current	15-25mA (standby <5mA)
Output Interface	3.5mm stereo jack + solder pads
Dimensions	40mm × 25mm × 5mm

Pin Configuration

Pin	Label	Description
1	VCC	Power input (3.7-5V)
2	GND	Ground
3	L-OUT	Left channel audio output
4	R-OUT	Right channel audio output
5	BT_STATUS	Bluetooth connection indicator
6	MODE	Operation mode selection

Note: The 3.5mm audio jack is automatically disconnected when using L-OUT/R-OUT pins

Connection Diagram

Typical Wiring

Connect 5V power to VCC and GND
Connect L-OUT/R-OUT to amplifier input
Optional: Connect BT_STATUS to LED
Optional: Add power switch to VCC line

Tip: Use shielded audio cables for best noise immunity

Operation Instructions

Pairing Mode

Power on the module (blue LED flashes)
Enable Bluetooth on your device
Select “VHM-314” from device list
No pairing code required (default)

Status Indicators

Fast blinking: Pairing mode
Slow blinking: Connected, no audio
Solid on: Audio streaming
Off: Powered down

Arduino Integration

// Arduino Bluetooth Status Monitor
const int btStatusPin = 2; // Connected to BT_STATUS

void setup() {
  Serial.begin(9600);
  pinMode(btStatusPin, INPUT);
}

void loop() {
  int status = digitalRead(btStatusPin);
  
  if(status == HIGH) {
    Serial.println("Bluetooth connected");
  } else {
    Serial.println("Bluetooth disconnected");
  }
  
  delay(1000);
}

// Arduino Bluetooth Status Monitor

const int btStatusPin = 2; // Connected to BT_STATUS

void setup() {

Serial.begin(9600);

pinMode(btStatusPin, INPUT);

}

void loop() {

int status = digitalRead(btStatusPin);

if(status == HIGH) {

Serial.println("Bluetooth connected");

} else {

Serial.println("Bluetooth disconnected");

}

delay(1000);

}

Advanced Control: The MODE pin can be used to change between different audio profiles (AT commands required)

Troubleshooting

No Sound Output

Check power supply (5V recommended)
Verify Bluetooth connection status
Ensure audio source is playing
Test with headphones on 3.5mm jack

Poor Audio Quality

Keep away from WiFi routers/microwaves
Reduce distance between devices
Check audio source quality
Ensure proper grounding

Connection Drops

Check for low battery (if using battery)
Reduce obstacles between devices
Avoid USB 3.0 ports for power
Reset module by power cycling

Application Examples

🏠 Home Audio

Wireless upgrade for old speakers

🚗 Car Stereo

Bluetooth interface for car audio

🎤 DIY Projects

Wireless audio for art installations

📻 Portable Boombox

Battery-powered wireless speaker

Hotline 24/7

VHM-314 Bluetooth Audio Receiver Board Module

VHM-314 Bluetooth Audio Receiver Board Module

Introduction