Today i noticed an Awkward function
i had designed a shield to work with an arduino mega 2560 .
i am using it to control something in an elevator (lift) so the elevator is connected to a 3 phase line
to power up my 12v transformer for arduino i am using one line of them for 220v with natural line
everything work fine
Today i wanted to check something in my arduino so i bring up with me my laptop in order to check the serial output with arduino ide
i was powering my laptop from the same line as the arduino's power transformer
when the elevator started running the Arduino IDE was always disconnected from the usb port
the Awkward is that when i removed my laptops power transformer from the line and leave it ti work with the battery , everything worked fine..
any explanation why this is happening?