How to Use HY-103: Examples, Pinouts, and Specs

The HY-103, manufactured by BATARA, is a compact, low-cost, high-performance DC-DC buck converter module. It is designed to efficiently step down higher input voltages to lower output voltages, making it ideal for a wide range of electronic applications. Its small size and high efficiency make it a popular choice for powering microcontrollers, sensors, and other low-voltage devices in embedded systems.

• Powering microcontrollers (e.g., Arduino, Raspberry Pi)
• Voltage regulation in battery-powered devices
• Supplying power to sensors and modules in IoT systems
• General-purpose voltage step-down in electronic circuits

The HY-103 offers robust performance and flexibility for various voltage regulation needs. Below are its key technical specifications:

The HY-103 module has four pins for easy integration into circuits. The table below describes each pin:

The HY-103 is straightforward to use in a circuit. Follow the steps below to integrate it into your design:

1. Connect the Input Voltage:

   • Connect the VIN pin to the positive terminal of your power source.
   • Connect the GND pin to the negative terminal of your power source.

2. Set the Output Voltage:

   • Use the ADJ pin to adjust the output voltage. Typically, this is done by connecting a potentiometer or resistor divider to the ADJ pin.
   • Measure the output voltage at the VOUT pin using a multimeter and adjust the potentiometer until the desired voltage is achieved.

3. Connect the Load:

   • Connect the device or circuit you want to power to the VOUT pin and GND pin.

4. Verify Connections:

   • Double-check all connections to ensure proper polarity and secure wiring.

• Input Voltage Range: Ensure the input voltage is within the specified range (4.5V to 28V). Exceeding this range may damage the module.
• Heat Dissipation: For high-current applications, consider adding a heatsink or improving airflow around the module to prevent overheating.
• Output Voltage Adjustment: Use a precise multimeter when adjusting the output voltage to avoid overvoltage or undervoltage conditions.
• Capacitors: Add input and output capacitors (e.g., 10µF to 100µF) close to the module to improve stability and reduce noise.

The HY-103 can be used to power an Arduino UNO by stepping down a 12V input to 5V. Below is an example circuit and Arduino code:

• Connect a 12V power source to the VIN and GND pins of the HY-103.
• Adjust the output voltage to 5V using the ADJ pin.
• Connect the VOUT pin of the HY-103 to the 5V pin of the Arduino UNO.
• Connect the GND pin of the HY-103 to the GND pin of the Arduino UNO.

// Example code to blink an LED connected to pin 13 of the Arduino UNO
// Ensure the HY-103 is providing a stable 5V to the Arduino UNO.

void setup() {
  pinMode(13, OUTPUT); // Set pin 13 as an output pin
}

void loop() {
  digitalWrite(13, HIGH); // Turn the LED on
  delay(1000);            // Wait for 1 second
  digitalWrite(13, LOW);  // Turn the LED off
  delay(1000);            // Wait for 1 second
}

1. No Output Voltage:

   • Cause: Incorrect wiring or insufficient input voltage.
   • Solution: Verify that the VIN and GND pins are connected correctly and that the input voltage is within the specified range.

2. Output Voltage Fluctuates:

   • Cause: Insufficient input/output capacitors or unstable input power source.
   • Solution: Add capacitors (e.g., 10µF to 100µF) close to the VIN and VOUT pins to stabilize the voltage.

3. Module Overheats:

   • Cause: Excessive current draw or poor heat dissipation.
   • Solution: Ensure the load does not exceed the 3A maximum current rating. Add a heatsink or improve airflow around the module.

4. Cannot Adjust Output Voltage:

   • Cause: Faulty potentiometer or incorrect adjustment procedure.
   • Solution: Replace the potentiometer and ensure proper adjustment using a multimeter.

Q: Can the HY-103 be used with a 24V input?
A: Yes, the HY-103 supports input voltages up to 28V. Ensure the output voltage is adjusted appropriately for your application.

Q: What is the minimum load current required for stable operation?
A: The HY-103 does not require a minimum load current for stable operation, but adding a small load (e.g., 10mA) can improve performance in some cases.

Q: Is the HY-103 protected against short circuits?
A: No, the HY-103 does not have built-in short-circuit protection. Use external protection circuits if needed.

Q: Can I use the HY-103 to power a Raspberry Pi?
A: Yes, the HY-103 can be used to power a Raspberry Pi. Ensure the output voltage is set to 5V and the current requirement does not exceed 3A.