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Sometimes you need to clear, wipe, erase, - whatever you want to call it - to run code on it from a different source, such as the Processing platform, and you don't want to run the code currently uploaded code. You've tried to upload a blank sketch and you get this Error Message:


core.a(main.cpp.o): In function `main':
C:\Program Files\Arduino\hardware\arduino\cores\arduino/main.cpp:11: undefined reference to `setup' C:\Program Files\Arduino\hardware\arduino\cores\arduino/main.cpp:14: undefined reference to `loop'



Here how to do it.

Step 1: Remove All Unnecessary Hardware.

Remove all the unnecessary hardware and connect the Arduino to the computer.

(Yes, I'm using a spin off of the Arduino. It's still the same concept.)


(To get a RedBoard [ the spin off ] go here.)

Step 2: Upload the Sketch

Upload the attached sketch.
hi there and thanks<br>but you don't have to wipe data off of ur arduino<br>when you upload your new code the old one fades!<br>thanks -eg
<p>I meant for this to help people who don't want a sketch that they already have on the arduino to be running when they use it with other programs that take direct control of the arduino. On such example is found here: https://www.instructables.com/id/RGBs-with-Arduino-and-Processing/</p>
plus(+) if you were gonna sell your arduino you might want it to have no code u were using so this would be a great way to get rid of it...thanks eg
hi and i am not criticizing your inatructable...I like your idea!!! I was just stating you didn't have to do this...
Nope i had a problem with it when i had first uploded the blink program and then i overwrote a program i had a problem.... Now its all fine<br>
what board were you using when this issue happened, and this inatructable helped you?
well in general that's how it works........um what board care you using when that occurred?

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