Your link doesn't seem to work, so I can't see the code. It looks like it could be a baud rate mismatch. Have you got the speed in the serial monitor matching the Serial.begin() in the code?
Your link doesn't seem to work, so I can't see the code. It looks like it could be a baud rate mismatch. Have you got the speed in the serial monitor matching the Serial.begin() in the code?