Hi I am new to the community and just started to assemble the Nybble these few days, there are a couple of questions I would like to get some advice, I might have missed some important details from the guidelines : |. Thanks in advance. Nybble board v2, no Pi 1) Does it require soldering the ultrasonic to the D8, D9, D10 and GND? The pins seems to be detached easily 2) One of the legs keeps vibrating itself during calibration, I managed to stop it for a while but it seems something not right as it didn't happen to other legs. What should I check? 3) There are some constant noise coming out from Nybble when I send out the comment like ksit through serial monitor, is it normal? 4) How to activate the ultrasound senor, I tried to upload the Nybble.ino, it was complied successfully but once the upload is done, the buzzer sound keeps coming out from the Nybble for long time. What should I check? Thanks again