When we upload the software in the circuit we have installed on my friend's computer, the buzzer beeps correctly when necessary. This is a pedestrian turnstile project.
If the QR code we read is incorrect, it beeps. And it does not give the right to pass through the turnstile.
But when I upload the software from my own computer, when the upload is complete, the buzzer starts beeping constantly.
We are both using 1.8.19 Ide. We both use the same libraries.
My computer has no electricity. What could be the reason for this?
Please help.
Always show us a good schematic of your proposed circuit.
Show us a good image of your ‘actual’ wiring.
Give links to components.
???
Can we see the software? ... and a schematic?
abacus
Maybe the buzzer is wired differently?
Your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advice on) your project 
See About the Installation & Troubleshooting category.
Please attach pictures