The EWM104-BT13 series is not a traditional Bluetooth module for audio transmission, but a dedicated module that utilizes the low-power consumption and stable connection features of Bluetooth 5.0 to achieve proximity sensing, wireless control, and IO/PWM driving. Its biggest highlight is providing a convenient configuration and control entry through the WeChat Mini Program, which greatly reduces the usage threshold for end users, making it very suitable for consumer-grade and industrial-grade IoT applications such as smart door locks and remote control switches.

Features of EWM104-BT13 Series

Frequently Asked Questions (FAQ)

Integrating the "Frequently Asked Questions" sections of the EWM104-BT13series_UserManual and other related Bluetooth module documents, the typical problems and solutions for Bluetooth proximity switch modules are as follows:

1. No response after power-on, unable to connect?

• Power Supply Check (Top Priority):

• Voltage Confirmation: Ensure that the supply voltage is within the recommended range specified in the module's specification sheet (usually 3.3V). Exceeding the maximum voltage will cause permanent damage to the module.

• Power Supply Stability: Check if the power supply is stable, and the voltage should not fluctuate significantly or frequently.

• Polarity Confirmation: Be sure to confirm that the positive and negative poles of the power supply are connected correctly. Reversing the polarity will cause permanent damage to the module.

• Power-On/Off Sequence (If Applicable): Some complex modules have specific power enable pins (such as SYS_CTRL), which cannot be simply pulled up to the power supply. Refer to the official recommended power-on delay circuit.

• Initial State: New modules may require initial configuration and activation by sending AT commands via serial port or using the WeChat Mini Program.

2. Short Bluetooth connection range or unstable signal?

• Antenna and Environment (Determining Factors):

• Metal Shielding: Never place the module or antenna inside a metal casing, as this will greatly weaken the signal or even completely shield it.

• Antenna Installation: For models with external antennas (such as SX), ensure that a high-quality 2.4GHz antenna is used and connected correctly. The antenna should be exposed as much as possible and kept vertically upward.

• Harsh Environments: Avoid testing in corners, on the ground, by the seaside (seawater strongly absorbs radio waves), or near large metal objects. These environments will severely attenuate the signal.

• Co-Channel Interference: Devices such as Wi-Fi routers and microwave ovens operate in the 2.4GHz band and will cause interference. Try to stay away from interference sources or modify the module's Bluetooth channel via AT commands (if supported).

• Supply Voltage: A supply voltage lower than the recommended value will result in insufficient transmit power of the module, directly affecting the communication distance.

3. How to connect and configure the module using a mobile phone (WeChat Mini Program)?

According to the user manual, the quick steps are as follows:

1. Power On: Power on the module correctly.

2. Mobile Phone Search: Open the mobile phone's system Bluetooth settings interface and search for the device named "ebyte_switch".

3. Pair and Connect: Click on the device to pair, and enter the pairing code as prompted (the default is usually 123456 or 0000).

4. Use Mini Program: After successful pairing, scan the official QR code with WeChat to enter the dedicated WeChat Mini Program.

5. Configure and Control: In the Mini Program interface, you can configure module parameters (such as broadcast name, IO behavior, PWM parameters, etc.) and implement remote control after proximity sensing.

4. The module is easily damaged. How to prevent it?

• Electrostatic Discharge (ESD) Protection: RF chips are very sensitive to static electricity. When handling, soldering, and operating the module, standard anti-static measures must be taken (such as wearing an anti-static wristband).

• Moisture Sensitivity (MSD) Protection: Some components are moisture-sensitive devices. Pay attention to the humidity of the storage environment and follow the recommended soldering process (especially the reflow soldering temperature profile).

• Temperature Range: Although most modules are designed for industrial use (such as -40℃ ~ +85℃), long-term operation at extreme temperatures is not recommended unless there are special requirements.

• Soldering Process: Strictly follow the reflow soldering temperature profile in the data sheet for soldering. Excessively high temperature or prolonged heating time will damage internal chips and components.

5. IO control and PWM functions do not work?

• Configuration Confirmation: First, confirm whether the working mode of the IO port (input/output/pull-up/pull-down), PWM frequency, and duty cycle have been set correctly via serial port AT commands or the WeChat Mini Program.

• Hardware Connection: Check if the external circuit connection is correct and whether the load is within the driving capability range of the module (refer to the IO driving current and PWM driving capability in the specification sheet).

• Power Supply Load Capacity: Ensure that the system power supply can provide sufficient and stable current for the module and its driven external loads.

6. High bit error rate, incorrect or delayed response to control commands?

• Wireless Interference: This is the main cause of data errors. Check if there is strong 2.4GHz co-channel interference in the environment and try to avoid it.

• Power Supply Quality: Use a high-quality regulated power supply with low ripple coefficient. Unclean power supply will cause abnormal operation and logic errors of the module.

• Connection Parameters: Check whether parameters such as Bluetooth connection interval are set reasonably. An excessively long connection interval may cause obvious control delay.

Ebyte's Bluetooth proximity switches are centered around the EWM104-BT13 series, accurately positioning themselves in the non-audio short-range sensing and control market. It successfully combines the wireless connection capability of Bluetooth 5.0 with GPIO/PWM hardware control functions, and greatly simplifies end-user interaction through the WeChat Mini Program.

The keys to successful application are:

1. Correctly Understand Requirements: Clarify that you need proximity sensing and wireless switch control (such as smart locks), rather than audio stream transmission.

2. Rigorous Hardware Design: Especially the stability and accuracy of the power supply, and the correct layout and installation of the antenna, which are the cornerstones of stable operation of all wireless modules.

3. Make Good Use of Software Tools: Make full use of the official WeChat Mini Program for rapid prototype verification and user configuration, which can greatly improve development efficiency and user experience.

4. Follow Development Guidelines: Carefully read the User Manual and strictly operate in accordance with the "Hardware Design Requirements" and "Soldering Operation Instructions", which is the fundamental way to avoid hardware damage and substandard performance.

For simple applications such as proximity switches, smart door locks, and wireless remote controls, the EWM104-BT13 series provides an excellent solution with high integration and low development difficulty.