Hi Erik,
what does it mean if you write "the digital output 3 is controlled" ????
This is an unprecise description. You should clearly describe in detail what shall happen.
Your own effort that you have shown to your potential helpers so far is:
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Having searched on the internet for a suitable code (unprecise description no number "I have searched "X" hours for a code that meets my requirements"
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A link to a website where one code that seems to do do half what you want
What do you think:....... did you already show great own effort??? No you didn't.
The willingness to help you will increase dramatically, if you can prove and testify to your own commitment.
You can attest your own effort by actually doing the work you can do yourself.
This work that you can do is:
- The most important step to do this is to post a sketch as a code-section.
- asking any - and if I write "any" I really mean any question that is specific about the code you want to use as the starting point.
- posting the exact type of RFID-reader you have
- posting a datasheet of your RFID-reader
- writing, if you have successfully managed to compile and upload a working demo-code that simply reads the card and prints the cardnumber to the serial monitor.
Or in case it did not work writing a detailed description of the steps you made and what you observed.
Even if you have any question about any step of how to work with Arduino just ask this question.
Even if you have a question about the very first line of the code just ask this specific question.
Nobody here will write down another RFID-code-tutorial that especially meets your requirement and will cover all and any possible question that you might have.
You have to ask your specific questions.
Specific questions are much much easier to answer because they are specific.
You should post your own attempt how you assume how a modification of the code might be done.
You wrote about removing the buzzer.
Post the original code from the link as a code-section
then modify this code by commenting out these lines of code that you assume could be removed
commenting out is done by starting the line with double-slash "//"
So simply add double-dashes on the left to these lines of code where you assume this code can be removed because it only has to do with the buzzer.
And then post the modified code as a second code-section.
Here you can read how you can post code as a code-section: