How to Use HLK-PM01: Examples, Pinouts, and Specs

The HLK-PM01 is a compact and efficient AC-DC power module manufactured by Hi-Link. It is designed to convert a wide range of AC input voltages (85-265V AC) into a stable 5V DC output. This module is ideal for powering low-power electronic devices and is widely used in IoT applications, home automation systems, and embedded systems due to its small size and high reliability.

• Powering microcontrollers (e.g., Arduino, ESP8266, ESP32)
• IoT devices and smart home systems
• Low-power sensors and modules
• Replacing bulky linear power supplies in compact designs
• Industrial control systems

The HLK-PM01 is a highly efficient power module with the following key specifications:

The HLK-PM01 has six pins, as described in the table below:

1. Connect the AC Input:

   • Connect the AC IN (L) pin to the live wire of the AC mains.
   • Connect the AC IN (N) pin to the neutral wire of the AC mains.
   • Ensure proper insulation and safety precautions when working with high-voltage AC.

2. Connect the DC Output:

   • Use the +5V pin to power your device or circuit.
   • Connect the GND pin to the ground of your circuit.

3. Mounting and Placement:

   • Place the module on a PCB or securely mount it in your project enclosure.
   • Ensure adequate spacing and insulation to prevent accidental contact with high-voltage pins.

4. Filtering and Protection:

   • Add a fuse (e.g., 1A) on the AC input side for overcurrent protection.
   • Use capacitors (e.g., 0.1µF and 10µF) on the DC output side to reduce noise and improve stability.

• Safety First: Always handle the module with care when connected to AC mains. Ensure proper insulation and avoid touching the module while powered.
• Heat Dissipation: Although the module is efficient, ensure adequate ventilation to prevent overheating in high-temperature environments.
• Load Requirements: Do not exceed the maximum output current of 600mA to avoid damaging the module.
• Isolation: The module provides 3000V AC isolation, making it safe for use in most applications. However, ensure proper grounding for additional safety.

The HLK-PM01 can be used to power an Arduino UNO directly. Below is an example circuit and code:

1. Connect the +5V pin of the HLK-PM01 to the 5V pin of the Arduino UNO.
2. Connect the GND pin of the HLK-PM01 to the GND pin of the Arduino UNO.
3. Connect the AC IN (L) and AC IN (N) pins to the AC mains (with proper insulation and safety precautions).

// Example code to blink an LED using Arduino UNO powered by HLK-PM01

const int ledPin = 13; // Pin connected to the onboard LED

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

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

1. No Output Voltage:

   • Cause: Incorrect AC input connections or insufficient input voltage.
   • Solution: Verify the AC input connections and ensure the input voltage is within the 85-265V AC range.

2. Output Voltage Fluctuations:

   • Cause: Insufficient filtering or unstable load.
   • Solution: Add capacitors (e.g., 0.1µF and 10µF) on the output side to stabilize the voltage.

3. Module Overheating:

   • Cause: Exceeding the maximum output current or poor ventilation.
   • Solution: Reduce the load current and ensure proper ventilation around the module.

4. Buzzing Noise:

   • Cause: High-frequency noise from the module.
   • Solution: Ensure proper grounding and add filtering capacitors to reduce noise.

1. Can the HLK-PM01 power a Raspberry Pi?

   • No, the HLK-PM01 provides a maximum current of 600mA, which is insufficient for most Raspberry Pi models.

2. Is the HLK-PM01 safe for use in home automation projects?

   • Yes, the module is CE and RoHS certified and provides 3000V AC isolation, making it safe for such applications when used with proper insulation.

3. Can I use the HLK-PM01 with a 12V DC input?

   • No, the HLK-PM01 is designed for AC input only (85-265V AC). For DC input, consider using a DC-DC converter.

4. What happens if I exceed the maximum output current?

   • Exceeding 600mA may cause the module to overheat or fail. Always ensure the load current is within the specified limit.

By following this documentation, you can safely and effectively use the HLK-PM01 in your electronic projects.