Hissing/Humming noise from arduino Uno R3 board when codes are loaded in.

As aforementioned, after plugging in a myriad of inputs and outputs for both analogue and digital pins there is a humming/hissing noise from the board after the codes are loaded into the board. Please advice

Have you tried Deet?

3051cookie:
As aforementioned, after plugging in a myriad of inputs and outputs for both analogue and digital pins there is a humming/hissing noise from the board after the codes are loaded into the board. Please advice

"Myriad" isn't a term too well understood here, so might be a good idea to provide a schematic. Also post the code.

My wild guess is some kind of current overload, but I really don't know. Are you sure the sound is from the board and not one of the myriad of devices connected?

AWOL:
Have you tried Deet?

Awesome!

On topic: It might be a resonating coil. I used to have the same problem with a product. After selecting another coil (other value) it stopped.

There is a coil on the arduino for the power supply. So whenever you have a power output that causes it to resonate, you'll hear a coil-mosquito.

Can't harm electronics, just your ears.

Can't harm electronics, just your ears.

Wrong.

PaulS:

Can't harm electronics, just your ears.

Wrong.

Ok.