Hw-044 Datasheet Jun 2026

The HW-044 is a compact, pre-assembled module designed to drive common-cathode LED displays. Its core component is the integrated circuit from Maxim Integrated (now Analog Devices). The module allows microcontrollers (e.g., Arduino, ESP32, STM32) to control up to 64 individual LEDs (8 digits of 7-segments plus decimal points, or an 8x8 dot matrix) using only three I/O pins .

Most HW-044 boards are preconfigured for (both left and right channels are summed internally). Check your board’s back side for jumper pads to change channel routing.

The center values are rarely 512 exactly. Run the above sketch and note the idle values (usually between 490 and 530). Use these as your zero offsets in code. hw-044 datasheet

The (often marketed as the RS232 to TTL Converter Board) transforms high-voltage RS232 signal levels ( ± 12V typically) into low-voltage 3.3V or 5V TTL signals, and vice versa. It is specifically designed to allow microcontrollers to communicate with devices that have a standard DB9 RS232 port. Key Applications

Internally, the circuit is simple:

Interfacing microcontrollers with PLCs or industrial sensors.

: Upload the following sketch to your Arduino. This code initializes the hardware serial port at 9600 baud. It will read any data sent from your PC (via the RS232 cable) and immediately send it back (echo it). The HW-044 is a compact, pre-assembled module designed

The HW-044 includes two onboard surface-mount LEDs (typically Red and Blue/Green) to communicate the system state: Blue/Green LED System Status OFF Battery is currently charging. OFF ON Charging is complete; battery is fully charged. Blinking / Dim ON

MAX3232 (a modern, lower-voltage alternative to the classic MAX232). Operating Voltage: Supports both 3.3V and 5V systems (range of 3.0V to 5.5V). Baud Rate: Theoretically supports up to 230,400 bps Most HW-044 boards are preconfigured for (both left

Using the LedControl.h library: