Constant Analog Serial Data Stream | Generated by AI
The board is alive and running at 9600 baud. It’s sending serial data — ASCII numbers like 47\r\n, 52\r\n, 53\r\n… These look like analog readings (e.g., Serial.println(analogRead(A0))).
This means your sketch is already on the board, but it’s NOT the Blink sketch — it’s one that reads an analog pin and prints it continuously.
Here’s what the 3 LEDs mean:
| LED | State | Why |
|---|---|---|
| ON (green) | ✅ Steady | Board has power — normal |
| L (pin 13) | ✅ On or blinking | The sketch may be driving it, or leftover state |
| TX (yellow) | ✅ Steady | The sketch is printing serial data constantly with no delays — TX LED stays lit because bytes are streaming non-stop |
| RX | off | Nothing is sending TO the board |
The constant serial printing (no delay() between prints) is why the TX LED appears solidly lit — it’s sending data as fast as the UART can go.
Do you want me to help you upload a fresh sketch to the board? For example, the standard Blink example to verify it works, or your modified blink with the 100ms delay?