Connecting multiple sensors to an Arduino.

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hi everyone,

i am  working on project in need run 2-3 sensors , relay blocks based on arduino code.
i see leonardo spec that:
dc current per i/o pin   40 ma
dc current 3.3v pin   50 ma

however not see currents specs 5v pin.

i want know 3 things:

1. need run 2 sensor spec call them out using 13ma each  total of 26ma
based on numbers see can safely connect both of them arduino 3.3v pin? @ point may want connect 3.3v aref pin.

2. same logic apply component may want connect ardunio board? if not can please me?

3.lastly, best way connect 2 wires same pin (see question 1)

quote

however not see currents specs 5v pin

that because depends on lot of things.
if usb or externally powered?
  a) usb has maximum current of 500ma
  b) external power depends on voltage of external power because of heat regulator can get.

quote
based on numbers see can safely connect both of them arduino 3.3v pin

yes

quote
does same logic apply component may want connect ardunio board?

yes

quote
what best way connect 2 wires same pin

put in row of header pins , solder wires pin


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