Hi I need help with a simple circuit. If I powered Arduino from vin at 5 volts, without connecting anything but 3 NPN 2N2222A transistors how many amps would arduino consume? And how many if I add a IR reciver?
You cannot power the Arduino with 5v on the Vin pin.
5v can be connected to the 5v pin on the UNO etc.
Devices can be powered from the same 5v supply.
Sorry i didn't understand why i can't power Arduino nano from Vin to 5v
The Vin pin is connected directly to the internal regulator of the board and for this regulator to work well you have to supply a voltage about 2V higher than the output (5V).
For the Vin you can place an input between about 7V to 20V, (I think I remember, check it).
The output of this regulator is the 5V pin that feeds the board itself and the peripherals connected to it.
If you want to feed with 5v you can only use the 5V pin and not connect the Vin.
Greetings.
As mentioned, the Vin pin has an input minimum voltage level of 7v.
Ok thanks
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