If you are using a Raspberry Pi (GPIO direct) or ESP32:
# Check if device is recognized dmesg | grep -i ch34 # Should see: usb 1-1.2: ch34x converter now attached to ttyUSB0 hw-417-v1.2 driver
HW-417-V1.2 is a common USB-to-TTL serial adapter board typically based on the FTDI FT232RL If you are using a Raspberry Pi (GPIO
Ensure TX on the HW-417 goes to RX on the MCU, and RX goes to TX. Power mismatch or bad grounds. hw-417-v1.2 driver
The driver here is the Arduino’s USB-to-serial driver, not an HW417-specific driver.
void setup() Serial.begin(9600);