The HW-597 is a 6-pin USB-to-TTL converter module. It converts USB data signals from a computer into TTL (Transistor-Transistor Logic) level UART serial communication (TXD/RXD) that microcontrollers can understand.
Because the logic is inverted, you write LOW to turn the relay on . hw-597 driver
: A physical header allows you to switch the VCC and logic levels between 3.3V and 5V . This makes it safe for both 5V legacy chips (like the ATmega328P) and modern 3.3V chips (like the ESP8266 or STM32). The HW-597 is a 6-pin USB-to-TTL converter module
void setup() Serial.begin(9600); Wire.begin(); if (!sensor.begin()) Serial.println("HW-597 not found. Check wiring."); while(1); : A physical header allows you to switch
If an old or incorrect driver is assigned to the device, go to Device Manager , right-click the failing device, click Uninstall Device , check the box to delete the driver software, and run the official CH341SER.EXE installer fresh.
Модуль RC026. HW-597. USB - COM (TTL) Переходник