Hw-044 Datasheet ((free)) Guide
The HW-044 has clearly labeled on the PCB:
: Ensure all grounds (MCU, HW-044, and the RS232 device) are tied together. Loose or missing grounds are the #1 cause of "gibberish" or inaccurate hex values in the serial monitor. Voltage Matching : If using an ESP32 or Raspberry Pi, power the module with . If using an Arduino Uno, power it with
When LV side drives low (0V), MOSFET turns on, pulling HV side low. When LV side is high (or high-impedance), MOSFET is off, and HV side is pulled up to HV voltage via its pull-up. hw-044 datasheet
Integrates a standard female DB9 port for direct connection to older industrial equipment or RS232-to-USB cables.
The is a compact, highly reliable RS232-to-TTL serial converter board built around the MAX3232 integrated circuit . This hardware solution bridges the gap between legacy industrial computer equipment running high-voltage RS232 protocols and modern low-voltage microcontrollers like Arduino, ESP32, STM32, and Raspberry Pi. HW-044 Datasheet & Technical Specifications Hardware Specifications Specification Core Transceiver IC Texas Instruments / Maxim MAX3232 Dual driver/receiver architecture Operating Voltage (VCC) 3.0V to 5.5V DC Supports both 3.3V and 5V logic Logic Level Side (TTL) Autocompatible with microcontrollers RS232 Connector DB9 Female (9-Pin) Direct connection to PC COM ports Maximum Data Rate 120 Kbps Standard communication ceiling Board Dimensions 32 mm × 30 mm (approx) Ultra-compact PCB form factor Onboard Passives 4 × 0.1µF Capacitors External charge pump network Functional Overview & Core Mechanism The HW-044 has clearly labeled on the PCB:
| Parameter | Symbol | Min | Typical | Max | Unit | |-----------|--------|-----|---------|-----|------| | Supply Voltage | VCC | 3.0 | 5.0 | 5.5 | V | | Supply Current (5V) | ICC | - | 6 - 10 | 15 | mA | | Analog Output Voltage (Center) | Vout_center | 2.3 | 2.5 | 2.7 | V | | Analog Output Voltage (Full left/up) | Vout_min | 0 | 0.1 | 0.3 | V | | Analog Output Voltage (Full right/down) | Vout_max | 4.7 | 4.9 | 5.0 | V | | Push-Button Activation Force | F_sw | 400 | 600 | 800 | gf | | Push-Button Resistance (Pressed) | R_on | - | 0 | 50 | Ω | | Push-Button Resistance (Released) | R_off | 10M | - | - | Ω | | Mechanical Travel Angle (each axis) | θ | - | ±25 | - | Degrees | | Operating Temperature | Top | -25 | 25 | 85 | °C |
| GAIN Connection | Gain (dB) | Output Level (max) | |----------------|-----------|--------------------| | Float (default) | 9 dB | ~1.4x input | | VDD (VIN) | 12 dB | ~2.0x input | | GND | 15 dB | ~2.8x input | | Not available* | 18 dB * | Not on HW-044 | If using an Arduino Uno, power it with
Example registers: