30 Days Lost in Space → Help Center

Troubleshooting — 30 Days Lost in Space Help Center

Component guides, wiring references, code explanations and fixes for the errors people hit most in 30 Days Lost in Space.

Troubleshooting

Something not working? Start here. Common problems and how to fix them.

• Buzzer Makes No Sound — Your buzzer is silent when it should be making a tone. Or it makes a quiet click when the code starts but nothing sustained.
• Code Compiles but Nothing Happens — Your code uploaded without errors. No red text, no warnings. But the Arduino does nothing. No LED, no serial output, no movement. Total silence.
• Compiler Error: expected ';' or Other Syntax Errors — You hit Verify or Upload and get red error text at the bottom of the Arduino IDE. The code will not compile.
• Display Shows Nothing (7-Segment / TM1637) — Your 4-digit 7-segment display is completely dark, or it shows the wrong numbers, or only some segments light up.
• Display Shows Nothing (OLED) — Your OLED display stays completely black after uploading your code. No text, no pixels, nothing. Or it worked before and stopped.
• My LED Won't Turn On — Your LED is completely dark. No light at all, not even a flicker. Or it was working five minutes ago and now it is dead.
• Serial Monitor Shows Weird Characters — You open the Serial Monitor and see garbage characters, squares, question marks, or nothing at all instead of the text your code should be printing.
• Upload Failed or Port Not Found — You hit Upload and get an error like 'programmer is not responding,' 'port not found,' or the port menu is grayed out. The code will not get to your board.