Power Supply for Nano

29 Aug 2017

So I am planning on using the Arduino nano for the brains of my garden watering project. I have a 12 volt power converter I kept from an old set of boot dryers that fell apart years ago. I know that the Nano can handle the volts but seeing as it's at the higher end of the acceptable range and I want to leave this thing plugged in 24/7, I think I'll use one of my 7805's. And since they lower voltage to 5 volts, I assume I can just run the power straight into the 5v pin.

Does this seem like a waste of time?

Also, am I blogging properly? I am so green...:(

Top Comments

sasquatch84 over 7 years ago in reply to beacon_dave

Yeah I'm driving a solenoid valve. I'll definitely be running it from the 12v power supply. Thanks!
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beacon_dave over 7 years ago in reply to sasquatch84

You should be ok as it has been designed to work with 12v supplies.

It will also depend on what else you are planning on powering through the Nano's voltage regulator. Sounds like your project may be driving solenoids etc. which you will want to look at powering separately from the Nano's supply.

If you power it up you will soon find out how much it heats up.
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sasquatch84 over 7 years ago in reply to beacon_dave

Awesome. So it won't heat up too much?
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beacon_dave over 7 years ago

It looks like the Nano can take up to 20v unregulated on pin 30 so you should be ok with your 12v supply.

https://store.arduino.cc/usa/arduino-nano
Power
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.
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