Make sure you have the correct connections between the STWC043LT-01 screen and the Arduino. Here are some steps to troubleshoot:
Connections: Ensure you have correctly connected the TX and RX pins. The TX of the screen should go to the RX of the Arduino, and the RX of the screen should go to the TX of the Arduino. Also, check the power and ground connections.
Baud Rate: Verify that the baud rate in your Arduino code matches the baud rate set for the screen. Mismatched baud rates can prevent communication.
Serial Port: Use Serial.begin(baudRate); in your Arduino code to initialize the serial communication with the correct baud rate.
Power Supply: Ensure that the screen is getting enough power. Sometimes the Arduino’s power supply might not be sufficient, so consider using an external power source.
Library: Check if there is a specific library for the screen that you need to include in your Arduino project.