int xValue = 0; int yValue = 0; int swState = 0;
The HW-044 is available from numerous online retailers, including . For smaller quantities, community-focused shops like Adafruit and SparkFun may also stock it or a very similar equivalent.
Includes internal charge pumps to generate necessary RS232 voltage levels from a single low-voltage supply without external capacitors. Common Applications
: Transmit Data line. Connects directly to your microcontroller's hardware or software UART RX pin . hw-044 datasheet
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
void setup() // Set encoder pins as inputs pinMode(CLK_PIN, INPUT); pinMode(DT_PIN, INPUT); pinMode(SW_PIN, INPUT_PULLUP);
// ... pin definitions and setup as before ... int xValue = 0; int yValue = 0;
4x 0.1µF charge-pump capacitors, 1x Power LED indicator, 1x DB9 Female Serial connector
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 versatile tool that enables many projects: Common Applications : Transmit Data line
#include <SoftwareSerial.h>
You can desolder the default resistor and replace it to scale down the current according to the following standard parameters: : 1000mA (Default) : 580mA : 400mA : 250mA : 130mA The mathematical formula used to calculate this value is:
The core of the HW-044 module is the , manufactured by Maxim Integrated. This chip is chosen for its low power consumption and ability to operate from a single power supply while maintaining RS232 level compatibility. Specification Chipset Input Voltage (VCC) 3.0V to 5.5V DC Communication Type Serial UART (Full Duplex) RS232 Connector DB9 Female Port TTL Interface 4-Pin Header (VCC, GND, TXD, RXD) Data Rate (Max) 120 Kbps (up to 235Kbps possible) Logic Levels TTL/CMOS (3.3V or 5V) Operating Temperature -40°C to +85°C Dimensions Approx. 32 × 32 × 16 mm 3. Pinout Configuration