Hw-044 - Datasheet |verified|

The is a compact MAX3232 RS232 to TTL level converter module commonly used in DIY electronics to bridge communication between standard computer serial ports and microcontrollers like Arduino or ESP8266. Key Technical Specifications

The HW-044 module features two distinct interfaces: a standard DB9 female port for the RS232 device and a 4-pin header for the microcontroller. TTL Interface (Microcontroller Side)

The ESP32 uses 3.3V for both power and analog reference. You can still operate the HW-044 at 3.3V or 5V—but if using 5V, the analog outputs will exceed the ESP32’s ADC range (0-3.3V). Use a voltage divider on the X and Y lines, or power the HW-044 at 3.3V directly. hw-044 datasheet

: While the IC supports up to 250kbps, long cables (over 15 meters) will require you to lower the baud rate to 9600 or 19200 to avoid data corruption.

The technical architecture of the HW-044 module centers around low-power consumption and wide voltage compatibility. Below is the foundational data normally compiled in its datasheet profile: Specification Texas Instruments / Maxim MAX3232 Dual driver/receiver architecture Operating Voltage (VCC) 3.0V to 5.5V DC Matches both 3.3V and 5V logical platforms Logic Level Side (TTL) Automatically scales with your VCC input Serial Level Side (RS232) ±5V to ±15V standard Fully compliant with EIA/TIA-232 standards Maximum Data Rate 120 Kbps to 250 Kbps Dependent on cable length and capacitance Hardware Connector DB9 Female Port Standard PC COM port footprint Pin pitch (TTL header) 2.54 mm (0.1 in) Breadboard-friendly pins Dimensions 32 mm × 30 mm × 14 mm Ultra-compact, low-profile layout 📌 Pinout Profile & Interface Layout The is a compact MAX3232 RS232 to TTL

The KY-023 and HW-044 are frequently interchangeable, but the HW-044 often has better quality control on the return springs. Always check the pin order before plugging in.

: Remember that on the TTL side, you must connect the module's TXD to the MCU's RX and the module's RXD to the MCU's TX . You can still operate the HW-044 at 3

) connected to Pin 2 of the TP4056 chip. The default resistor value is typically

The HW-044 is preferred over the older MAX232-based modules because it requires fewer and smaller external capacitors (usually 4 x 0.1 μF) and supports lower voltages. Pros:

Thus, the conversion works automatically .