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Topic: Can I power Nano via 9v through vin pin? (Read 9355 times) previous topic - next topic


Hi guys,
I am working on a project and just wanted to ask if my Arduino Nano Clone can be powered by 9v or 7.2v through the Vin pin, or it would burn my board. Till now I have been using the USB power with a 5v 1A Power Bank
and now i need to power it externally without USB. I juat want make a home a home automation system with HC-05, Arduino Nano and Relay.



You can power through the Vin pin because it goes to the regulator input.
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Oct 20, 2017, 08:41 pm Last Edit: Oct 20, 2017, 08:46 pm by TechDroidROOT
Can I power it even with 9v? and what is a regulator input?


Oct 20, 2017, 08:59 pm Last Edit: Oct 20, 2017, 09:00 pm by Noobian
Can I power it even with 9v? and what is a regulator input?
Arduino has a built-in voltage regulator.

You really should have checked the documentation page https://store.arduino.cc/usa/arduino-nano

The Arduino Nano can be powered via the Mini-B USB connection, 6-20V unregulated external power supply (pin 30), or 5V regulated external power supply (pin 27). The power source is automatically selected to the highest voltage source.


Means I can power it via 9v
Yes normally 9V is between the limits of 6-20V


OP mentioned a relay ??
If that is powered from the 5volt pin, then there are voltage limits.

OP, post a diagram and links to the parts you are going to use, so we don't have to guess.


20V on the Nano regulator will likely cook it.
http://www.ti.com/lit/ds/symlink/ua78m.pdf  UA78M05
The SOT223 package doesn't have sufficient cooling on the board to dissipate ((20V - 5V) * current drawn) of heat.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.


I am using this realy-

will arduino nano be sufficient for 5v?


A Nano can control many relays, but can only power ONE relay when the Nano is powered with 7.2 or 9volt on V-in (raw).
Why battery power. The four relays alone could draw >=300mA.
Can't you power the Nano+relays with e.g. a 5volt cellphone charger?

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