How to Use DIYMORE 4 USB Buck 8V-35V to 5V 8A Power Supply Module: Examples, Pinouts, and Specs

The DIYMORE 4 USB Buck Power Supply Module is a compact and efficient DC-DC step-down converter designed to provide a stable 5V output from an input voltage range of 8V to 35V. With a maximum output current of 8A, this module is ideal for powering multiple USB devices simultaneously. It features four USB output ports, making it suitable for applications such as charging smartphones, powering Raspberry Pi boards, or other USB-powered devices.

• Charging multiple USB devices (e.g., smartphones, tablets, power banks)
• Powering single-board computers like Raspberry Pi or Arduino
• Supplying power to USB-powered peripherals (e.g., LED strips, fans)
• Use in automotive or solar power systems for USB device charging

Below are the key technical details of the DIYMORE 4 USB Buck Power Supply Module:

The module has the following input and output connections:

1. Connect the Input Voltage:

   • Connect the positive terminal of your DC power source (8V-35V) to the VIN+ pin.
   • Connect the negative terminal of your DC power source to the VIN- pin.
   • Ensure the input voltage is within the specified range to avoid damaging the module.

2. Connect USB Devices:

   • Plug your USB-powered devices into the USB output ports.
   • The module will automatically regulate the input voltage to provide a stable 5V output.

3. Power On:

   • Turn on the DC power source. The module will begin supplying power to the connected USB devices.

• Input Voltage Range: Ensure the input voltage is between 8V and 35V. Exceeding this range may damage the module.
• Current Limitations: The total current drawn by all connected USB devices should not exceed 8A.
• Heat Dissipation: At high loads, the module may generate heat. Ensure adequate ventilation or use a heatsink if necessary.
• Polarity Protection: Double-check the polarity of the input connections to avoid damage.
• USB Cable Quality: Use high-quality USB cables to minimize voltage drops and ensure efficient power delivery.

The module can be used to power an Arduino UNO via its USB port. Below is an example of how to connect the module:

1. Connect a 12V DC power source to the VIN+ and VIN- terminals of the module.
2. Plug the Arduino UNO into one of the USB output ports using a USB cable.
3. The module will provide a stable 5V supply to the Arduino UNO.

Here is a simple Arduino sketch to test the setup:

// Simple LED Blink Test for Arduino UNO
// This sketch blinks the onboard LED to verify power supply functionality.

void setup() {
  pinMode(LED_BUILTIN, OUTPUT); // Set the onboard LED pin as an output
}

void loop() {
  digitalWrite(LED_BUILTIN, HIGH); // Turn the LED on
  delay(1000);                     // Wait for 1 second
  digitalWrite(LED_BUILTIN, LOW);  // Turn the LED off
  delay(1000);                     // Wait for 1 second
}

1. No Output Voltage:

   • Cause: Input voltage is outside the specified range or connections are incorrect.
   • Solution: Verify that the input voltage is between 8V and 35V. Check the polarity of the input connections.

2. Overheating:

   • Cause: High current draw or insufficient ventilation.
   • Solution: Reduce the load or ensure proper airflow around the module. Consider adding a heatsink.

3. USB Devices Not Charging:

   • Cause: Faulty USB cables or excessive current draw.
   • Solution: Use high-quality USB cables and ensure the total current does not exceed 8A.

4. Voltage Drop on USB Ports:

   • Cause: Long or low-quality USB cables.
   • Solution: Use shorter, high-quality cables to minimize voltage drop.

Q: Can I use this module to power a Raspberry Pi?
A: Yes, the module can power a Raspberry Pi via one of its USB ports. Ensure the total current drawn by all connected devices does not exceed 8A.

Q: Is the module protected against reverse polarity?
A: No, the module does not have built-in reverse polarity protection. Double-check the input connections before powering on.

Q: Can I use this module in an automotive application?
A: Yes, the module is suitable for automotive use, as long as the input voltage remains within the 8V-35V range.

Q: What happens if I exceed the 8A current limit?
A: Exceeding the current limit may cause the module to overheat or shut down. Always ensure the total load is within the specified limit.