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I run my Arduino Nano IOT 33 after double clicking the reset button and it works fine. However, as soon as I upload code to it, I cannot open the serial, see the port, or connect my blynk app to it.

Sorry for not explaining it well the first time. As for the code I do not have specific code that is causing an error. I even uploaded a hello world sketch and it did not work.

my pinout is the following

3.3V -> V(external analog sensor)
3.3V -> V(external analog sensor)
A0 -> pinIn
A1 -> pinIn
Gnd - gnd
Gnd - gnd

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    I'm sure that if you fix the things you are doing wrong it will be fine. – jwh20 Dec 15 '20 at 10:15
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    As you have given nearly no information about your setup, your code and your wiring, we cannot help you. Please edit your question and add all the information. Also please add a detailed description, what you are expecting to happen and what actually happens. – chrisl Dec 15 '20 at 10:22
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    The board connects to computer over native USB support of the MCU. The handling of the USB is done by Arduino core functions linked at build to your sketch. A consequence of using the native USB port is, if your sketch has a problem, it influences the USB. – Juraj Dec 15 '20 at 13:10
  • The "Im in a big hurry ... teacher." line likely hasn't have the effect you'd hoped; it makes your question a bit radioactive, to me anyway. If you edit your question to include the missing information, namely the code as chrisl said, I'd strongly suggest removing that bit. If time is important, any detail you can provide that cuts down on round-trip time through comments is good. E.g. unambiguous references to libraries used, their versions, etc. Make sure your code is indented. It's better if it is complete enough to be compiled. – timemage Dec 15 '20 at 15:55
  • I don't know how to interpret A0 -> pinIn, what is this "sensor"? Does your board have this problem with no external circuitry attached? That is, does it show the same problem with just the board connected to the host by USB cable? – timemage Dec 15 '20 at 21:05

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