Ensure a 0.1µF ceramic decoupling capacitor is placed close to the VCC and GND pins of the module to filter out power supply noise.
Works with almost any microcontroller regardless of whether it's 3.3V or 5V.
Complete Guide to the HW-044 MAX3232 RS232-to-TTL Converter Module
| 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 | hw-044 datasheet
While the module supports charging the battery while a load is connected to OUT+ and OUT- , it is not highly recommended. The load can trick the TP4056 into thinking the battery is still absorbing current, preventing the chip from properly terminating the charge cycle.
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 .
Illuminates when the battery voltage reaches 4.2V and the charging current drops below the termination threshold (1/10th of the programmed current). Ensure a 0
The core of the HW-044 is the Texas Instruments MAX3232 (or equivalent compatible IC), which allows for low-power, high-speed data transmission. Specification 3.0V to 5.5V DC Communication IC MAX3232 (Dual Driver/Receiver) Maximum Data Rate Connector Type DB9 Female (RS232 side) Interface Pins VCC, GND, TX, RX (TTL side) Operating Temp -40°C to +85°C Conversion Type Bi-directional (RS232 ↔ TTL) Pinout and Connection Guide
Connect to Arduino digital pins D2, D3, D4, D5 respectively.
// Now, echo the character back to the HW-044 mySerial.print(c); The load can trick the TP4056 into thinking
Ensure the ground of the Arduino and the ground of the RS232 device are connected through the HW-044. 6. HW-044 Advantages
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 .
Manages the CC/CV charging profile. It monitors battery voltage, controls the current loop, and terminates the charge cycle when the battery is full.