Serial monitor listing unreadable characters

Question

My Serial Monitor is displaying unreadable characters. If anybody can give me some insight on why this would be happening please let me know.

Thank You.

Answer 1

Change Serial.write to Serial.print (or Serial.println).

write writes in binary, which gives you unprintable characters.

Answer 2

Make sure the selected baud (like 115200, 57600) in Serial Monitor matched the one specified in code like Serial.begin(115200)

Answer 3

I had the same problem, baud rate was the same in the code as it was in the serial monitor. I tried changing the baud rate in the code to 19200 and the same in the serial terminal and that fixed the problem. Hope this helps, not sure why it wasn't working with the 9600 baud value. Also found that clicking on the wrong baud rate in the terminal and back on the right one fixed the issue with it displaying gibberish.