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How to get started with writing code for a Hall Effect sensor?

You can measure this in either RPM (revolutions per minute) or frequency (cycles per second). Whether it be a minute or a second, you count the number of times you get a pulse and at the end of the ...
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How to change variable/sketch through a GUI

Reflashing (and with that recompiling) the sketch for every variable change is very over-the-top. As you already want to write your own program for the PC I would suggest using Serial. That will be ...
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1 vote

serial is print twice?

In the Arduino IDE you should select "No Line Ending" from the menu, instead of "New line". Otherwise you are sending an extra "\n".
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1 vote

'MeDCMotor' does not name a type error inside mBlock

In the MakeBlock, menu "choice of extensions", uncheck all the extensions, keeping only the one called "Makeblock" checked:
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