Vin directly with 5v and 3.3V?

Other Hardware 3rd Party Boards
1

I have a "stupid" question.

If i give the 12V supply voltage in to the input "Vin" on my Arduino Mega2560, i will directly have the 5V and 3.3V Output?

I'm a little bit confused. So i just need to have a input voltage?

Greets and thanks

2

ArduinoGUIDE:
I have a "stupid" question.

If i give the 12V supply voltage in to the input "Vin" on my Arduino Mega2560, i will directly have the 5V and 3.3V Output?

I'm a little bit confused. So i just need to have a input voltage?

Greets and thanks

Yes to both questions.
But take into account that the built-in regulators are not very powerful, so don't try to connect power-hungry components to 5V and 3,3V on the Arduino

3

Hi,

Yes. The Vin goes through a regulator and produces 5V. The 5V goes to a 3.3V regulator.

See THIS PAGE for details and the schematic diagram on the UNO..

LIMITATIONS: If an external power supply is connected to VIN, the current available from 5V depends on the power dissipated in the onboard regulator, which is a maximum of about 1.5W.

At 7V VIN this is about 700mA,
at 9V VIN it's about 350 mA ,
at 12V it's about 200 mA.

Calculate: I=P/E so available current at 5V = 1.5 / (VIN - 5)