I expect the components in my project to draw about 1.5amps when fully connected, although this is assuming that all LEDs and segments are on (which won't be the case).
I am using an Arduino nano, which is driving:
2 max7219's with 8x 7segment displays each
19x LEDs driven by 3x74HC595 shift registers
Several momentary push buttons
I wish to power the whole project from a battery, including the Arduino. Everything I find online so far suggests to use an external power supply to provide sufficient current, which is fine and i understand the pins on the arduino will be exceeded otherwise, but I can't find anything that shows me how to wire this! It might be an extremely basic or simple question, but I don't want to be frying my components.
My thoughts are:
Attach a battery (with min 6.5v) to input of a mini360 buck converter
This is variable so set output to 5v
connect all VCC pins of components to positive output from buck converter
all ground pins from components and the GND of arduino to negative from buck converter
push buttons all wired straight to 5v output, GND and analog pins on arduino
I then need to power the arduino. Do I also then connect the 5v pin to the output pin on the buck converter? I thought 5v on the arduino board was an output pin, but something I've just seen on youtube suggests otherwise, but it's unregulated unlike the VIN or barrel jack (which would require 7-12v).