Web Serial isn't available in this browser. Use desktop Chrome or Edge (v89+). You can still write and compile code here — Flash and the Serial Monitor need a supported browser.
Web IDE
— Load an example —
New
Download .ino
Download .bin
Compile
Flash
Ready
Connect
Disconnect
9600
57600
115200
230400
Not connected
Output
Serial Monitor
Show raw hex
Clear
Advanced / board diagnostics
Pulse DTR
Pulse RTS
Pulse Break
Send Enter (run)
Send