Hw-044 Datasheet «Extended – 2026»

The HW-044 is a MAX3232-based converter module designed to interface RS232 signals with TTL levels (3.3V-5V) for microcontroller communication. It is commonly applied in serial communication tasks, including firmware flashing and device upgrades. For technical specifications, see the documentation at Amazon.

Deep Dive into the HW-044: More Than Just a “Keyestudio” Sensor

If you have been tinkering with Arduino or Raspberry Pi for a while, you have likely accumulated a bag of miscellaneous blue breakout boards. One of the most common—yet often misunderstood—is the HW-044.

At first glance, it looks like a simple push-button or limit switch module. But if you just treat it as "button in/button out," you are missing half the story. Today, we are going to pull the actual HW-044 datasheet apart and look at the circuit, the logic, and why this module behaves differently than a raw mechanical switch. hw-044 datasheet

3. Pinout Description

The HW-044 has 20 pins clearly labeled on the PCB:

Left side (Low Voltage – LV)

• LV : Power supply for the low voltage side (e.g., 3.3V)
• GND : Common ground (must connect to both LV and HV grounds)
• LV1 – LV8 : 8 channels for low voltage side signals

Right side (High Voltage – HV)

• HV : Power supply for the high voltage side (e.g., 5V)
• GND : Common ground (connected internally to LV ground)
• HV1 – HV8 : 8 channels for high voltage side signals

⚠️ Note: LV1 corresponds to HV1, LV2 to HV2, and so on. Do not reverse the order. The HW-044 is a MAX3232-based converter module designed

8. Common Applications

• Digital clocks and timers
• Temperature displays
• Scoreboards or counters
• Small text/information panels (with 8x8 matrix)
• Industrial control panels

Interfacing HW-044 with Arduino

Here is a standard wiring diagram and code example to get your HW-044 running with an Arduino Uno.

6. Typical Connections (to Arduino Uno)

| HW-044 | Arduino Uno | |--------|-------------| | VCC | 5V | | GND | GND | | DIN | D11 (MOSI) | | CS | D10 (SS) | | CLK | D13 (SCK) | Deep Dive into the HW-044: More Than Just