Powering servo from 12V motorcycle batery

[vignu]

Hi, I'm quite new to elettronics and I need some help.
What I want to do is to power this servo using my motorcycle lithium battery.
The servo has to be operated by pushing a button.
Searching online i understanded that i need a Buck converter like this, to reduce the motorcycle battery voltage to power the arduino (nano) . I know however that i cannot power the servo from the arduino but i need a separate power supply. What do you suggest? fell free to recommend also different compontents, but keep in mind i need it to be has small as possible.

Also, the bike doesn't have an ingition key, so if i plug all directly to the battery will it train much?

[DrDiettrich]

@vignu

but i need a separate power supply.

Right, use another buck converter for the servos.

Or step the voltage down to the servo voltage (6.8V?) and feed it also into the Arduino's on-board regulator (Uno barrel jack).

[Ron_Blain]

Buck converters have become really inexpensive like these for example. Personally I would just go with a couple of buck converters. Just make sure the converters will meet your voltage and current needs. Fancy buck converters include both Voltage and Current displays for In and Out.

Ron