will 6v to an normal pin fry my arduino uno

Just asking but will 6v to a normal pin fry my Arduino UNO?

Also, I'm am trying to send a signal from the Arduino to my gate to open it (to open/close it I have to GND a pin and the pin is a constant 6v) any suggestion on doing this?

Eventually, yes it will.

The answer is simple - terribly easy. :roll_eyes:

Don't!

A current limiting resistor should do the job just fine. 1k is probably enough already for so low voltage, 10k to be safe.

Another (safer) solution: diode between pin and external signal, anode to Arduino, enable internal pull-up.

james712346:
Just asking but will 6v to a normal pin fry my Arduino UNO?

As a general rule it is a bad idea to apply overvoltage signals to an Arduino pin.

Also, I'm am trying to send a signal from the Arduino to my gate to open it (to open/close it I have to GND a pin and the pin is a constant 6v) any suggestion on doing this?

A standard approach to switching voltages higher than the Arduino range is to use an external transistor. To properly design such a switch it is necessary to know a bit more about the signal being switched. For instance the current measured through an ammeter to ground of your control signal is an important design parameter.