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Topic: Simplest Battery Power to Arduino Nano Solution ? (Read 29850 times) previous topic - next topic

lambsoft

Hello All,

I am a beginner when it comes to Arduino and electronics, but I've built a few projects on an Uno and am having fun with it.

Right now I have a project which is both an Altimeter as well as a Servo Parachute Release for my water rockets.

I think the Uno solution is working just fine and I am powering it with a 9v battery via the simple battery connector.

I want to look at moving to using a Nano to streamline the design and I am getting stuck at the powering of the Nano. I get that I need to provide power either via the mini USB or directly to the board in the form of battery power but all my searches lead me to project about recharging batteries and things that seem to complicate my simple needs.

Is there a simple tutorial that show how you can power a Nano with +/- 5v of power so that it can run a Servo and a BMP180 or BMP280 - the BMPs only need 3.3v. I've seen a few diagrams that show powering the servo with its own battery and the Nano with another ?

What I'd really love to see is what parts are needed as well as where the connection of these parts hook into the Nano. I'm fine to do a little soldering if that is needed. I have a couple of 9v battery connectors for the Uno - can I just clip off the connector and solder the red and black wires to +/gnd on the Nano ?

Appreciate any help the community can offer...

Cheers

bos1714

#1
Jun 06, 2018, 05:04 pm Last Edit: Jun 06, 2018, 05:04 pm by bos1714
Hello there!

I looked up the specs on the Nano and it can be powered by placing 7-12 volts on the "Vin" pin and Ground on the "G" pin. Your 9V battery certainly meets this expectation.

Below is a picture of how you can power the board, as well as a snippet from the specifications page. All you would have to do is cut the small barrel from the end of the 9V battery snap so that the two wires are showing.

Time line? Time isn't made out of lines. It is made out of circles. That is why clocks are round.

Robin2

#2
Jun 06, 2018, 05:10 pm Last Edit: Jun 06, 2018, 05:12 pm by Robin2
You can power the Nano with 3 x AA (or AAA) alkaline cells (4.5v) connected to the 5v pin.

The 4.5v will also be suitable for powering a servo.

And the AA (or AAA) cells will last longer than the 9v PP3 style battery.

...R
Two or three hours spent thinking and reading documentation solves most programming problems.

lambsoft

Thanks for the responses.

I think I will go for a AA/AAA battery holder - something like the attached image.

It's just a little bulky but I'm not yet at the point of optimization yet, still just trying to get a functional solution. Going from an Uno to a Nano is already a big step in streamlining.

Thanks again.

outsider

If you only use 3 AAs in that holder, you will need a "dummy" battery to complete the circuit, I use a piece of 1/2 inch copper rod cut to the length of a AA and wrapped with tape, aluminum would probably work as well.

Delta_G

#5
Jun 07, 2018, 06:01 am Last Edit: Jun 07, 2018, 06:02 am by Delta_G
Hello there!

I looked up the specs on the Nano and it can be powered by placing 7-12 volts on the "Vin" pin and Ground on the "G" pin. Your 9V battery certainly meets this expectation.
While it might meet the voltage requirements, there is more to it than that.  Try running that motor for very long and let me know how that works out.  When you get tired of changing 9V batteries every few minutes, relegate those back to the smoke detector where they belong and get some real batteries. 
|| | ||| | || | ||  ~Woodstock

Please do not PM with technical questions or comments.  Keep Arduino stuff out on the boards where it belongs.

lambsoft

For my purposes I only need very short lived power - like less than a minute or two.

Its to power a parachute deployment mechanism / altimeter for a water rocket which end up flying for relatively short periods of time.

I was able to clip the plug off the 9v battery connector and i then soldered jumper on to the ends so I could easily plug them into a breadboard for testing and it works perfectly at least for now.

I'm still in the prototyping / testing stage of my project :-)

The only thing I like about the 9v compared to 4 AA batteries is the weight !! Quite a noticeable difference. So in this case the most optimal solution might be something else but for now a 9v looks like it will do the trick.

Already going from an Uno to a Nano is a huge saving in terms of size and weight for my rocket payload.

Thanks for the suggestions and help !

Robin2

If you just make an Atmega 328 on a piece of stripboard and use its internal 8MHz clock you can run off two alkaline cells (3v). I suspect a paid of AAA cells would power it for a long time.

And you can get some very small LiPo cells (3.7v) that could also power it and should be even lighter.

Indeed a 3v coin cell may be sufficient.

For even more weight reduction use an Attiny.

And I have built a few projects without any PCB, which would reduce the weight further. In my case I omitted the PCB to save space rather then weight.

...R
Two or three hours spent thinking and reading documentation solves most programming problems.

INTP

9v is lighter because it has lower capacity. It's basically a case of 6 1.5v AAAA batteries.
If it works, it works. Until it doesn't.

marselhollie

#9
Nov 18, 2019, 06:26 am Last Edit: Nov 18, 2019, 06:47 am by marselhollie
I havent read many of the posts but the 9volt battery photo is similar to "my" idea.

It is to wire two female usb ports in series and connect to vin/gnd.

Im gonna solder male usb plug onto lipo batteries and use the circuit board from cracked open power bank to charge these "hardware hacked" batteries

AnotherOptionforPortablePoweringNano33iot

Cheers to finding the way to build it, spent hours looking for this answer too hah!  :)





HermannSW

And you can get some very small LiPo cells (3.7v) that could also power it and should be even lighter.
I did that without issues, I just plugged my Lipo over the ISP pins 2 and 4:
https://forum.arduino.cc/index.php?topic=377850.msg2606104#msg2606104
αβ, xy & L₁/L₂ positioning systems w/ 2 28BYJ48 steppers:
https://forum.arduino.cc/index.php?topic=649769.0
Caterpillar robots:
https://forum.arduino.cc/index.php?topic=462107.msg3482895#msg3482895
https://stamm-wilbrandt.de/en/Raspberry_camera.html

marselhollie

They make micro usb rechargeable 9volts sold online.

The ratings are good so the 9 volt seems like the simplest way so far.


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