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, 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
• Industrial control systems
• Replacing bulky linear power supplies in compact designs

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

Note: Pins 3 and 6 are not connected internally and should not be used.

1. Input Connection:

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

2. Output Connection:

   • Connect the +5V pin to the positive terminal of your load or circuit.
   • Connect the GND pin to the ground terminal of your load or circuit.

3. Mounting:

   • Secure the module on a PCB or enclosure with proper insulation to avoid accidental contact with high-voltage pins.

4. Filtering:

   • For improved stability and reduced noise, add a 0.1µF ceramic capacitor and a 10µF electrolytic capacitor across the output terminals (+5V and GND).

5. Safety Precautions:

   • Avoid touching the module while it is powered.
   • Use a fuse and varistor on the AC input side for overcurrent and surge protection.

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

• Connect the AC-L and AC-N pins to the AC mains supply.
• Connect the +5V pin to the Arduino UNO's 5V pin.
• Connect the GND pin to the Arduino UNO's GND pin.

// 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
}

Note: Ensure that the HLK-PM01 is properly insulated and mounted to prevent accidental contact with high-voltage components.

• Always use proper insulation and enclosures when working with high-voltage AC.
• Do not exceed the maximum output current of 600mA to avoid damaging the module.
• Ensure adequate ventilation to prevent overheating during operation.

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

   • No, the HLK-PM01 cannot reliably power a Raspberry Pi, as it requires more current than the module's 600mA maximum output.

2. Is the HLK-PM01 safe for use in commercial products?

   • Yes, the HLK-PM01 is designed for use in commercial and industrial applications. However, ensure compliance with local safety regulations.

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). It cannot operate with a DC input.

4. What precautions should I take when using the HLK-PM01?

   • Always insulate the module and avoid direct contact with high-voltage pins. Use a fuse and varistor for added safety.

By following this documentation, you can safely and effectively integrate the HLK-PM01 into your projects.