Turn Weact Blackpill to uart-to-usb device by arduino
2026-06-27
Step 1:
Check your Tools menu and make sure your settings look exactly like this:
- Board: Generic STM32F4 series
- Board Part Number: BlackPill F411CE (Do not pick the generic F411 options)
- U(S)ART support: Enabled (generic 'Serial')
- USB support: CDC (generic 'Serial' supersede U(S)ART)
//PA10 (RX) and PA9 (TX)
void setup() {
// Initialize USB CDC
Serial.begin(9600);
// Initialize Hardware UART
Serial1.begin(9600);
}
void loop() {
// Read from USB and send to UART
if (Serial.available()) {
Serial1.write(Serial.read());
}
// Read from UART and send to USB
if (Serial1.available()) {
Serial.write(Serial1.read());
}
}