: Uses MOSFET-based H-bridges, resulting in significantly lower internal voltage drops compared to older BJT-based drivers like the L298N.
Safety Note: Never reverse the polarity of the B+ and B- connections. Doing so will immediately destroy the TP4056 chip and poses a severe fire hazard with lithium batteries. Core Circuit Architecture
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.
How does the HW-044 compare to similar products? Here is a quick comparison for reference.
The HW-044 module is divided into two sides: the DB9 female connector for PC/Equipment interaction and a 4-pin header for TTL device interaction. TTL Header Side (To Microcontroller) Power Supply Input (3.0V - 5.5V). GND: Ground. TXD: Transmit Data (TTL Level). RXD: Receive Data (TTL Level). RS232 Side (To PC/Industrial Device)
| Symptom | Likely Fix | |---------|-------------| | No signal on output | Check both LV and HV power are present and grounds connected | | Signal stuck high/low | Ensure both sides have common ground; check if signal is open-drain | | I²C not working | Reduce bus speed; check pull-up resistor values (4.7kΩ is fine for most) | | Distorted waveform at high speed | Reduce communication speed; use shorter wires |
The TP4056 handles the charging algorithm. When a battery is deeply discharged, the chip initiates a pre-charge (trickle charge) phase. Once the battery reaches a safe threshold, the chip transitions into constant-current (CC) mode, supplying the maximum configured current. As the battery approaches 4.2V, the chip switches to constant-voltage (CV) mode, gradually dropping the current until the battery is completely topped off. 2. The DW01A Protection IC & 8205A Dual MOSFET
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Below is a blog-style overview of the HW-044 datasheet specifications, pinout, and common use cases.
The module is straightforward. One side has a DB9 female connector, and the other has a standard 4-pin male header.
The HW-044 is not a standardized component like a 555 timer or a MOSFET. It is a breakout module assembled from generic parts. Therefore, no single company publishes an “official” datasheet under the name HW-044. Instead, the information is derived from:
Connects to the Negative (-) terminal of the single-cell Lithium battery.
Ensure the ground of the Arduino and the ground of the RS232 device are connected through the HW-044. 6. HW-044 Advantages
Connecting Arduino/Raspberry Pi to PCs for debugging or data logging.