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Topic: MKRFOX1200 autonomy on batteries (Read 4237 times) previous topic - next topic

astroman35

Hello guys,

I've recently bought a MKRFOX1200 from Arduino Store.
On the official website, it says that this board could run up to 6 months with 2x AA or AAA batteries.

So here is my questions : is it possible to power it with a LiPo 3,7v via green screw terminals ? I don't think so because it says "Applying more than 3.3V on any pin will damage the board.". I don't really want to try ! Do you confirm ?

So what are the options to run it for 2 years on batteries ? The project i'm working on is to check the value of a sensor 2 or 3 times per day and immediately go to deep sleep.

Thanks !

Robin2

I don't think so because it says "Applying more than 3.3V on any pin will damage the board.". I don't really want to try ! Do you confirm ?
Why is any confirmation required?

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

astroman35

Because i don't know if this board has a built-in voltage regulator that could handle 3,7v instead of 3v.

ballscrewbob

A lot of Lipos charge ABOVE 3.7V and quite often nearer 4.7V

Check the charge specs for your battery BEFORE yo connect it to ANYTHING.

It may not be the answer you were looking for but its the one I am giving based on either experience, educated guess, google or the fact that you gave nothing to go with in the first place so I used my wonky crystal ball.

astroman35

Ok thanks for yours answers.
Now, what are my options if i want to run it for 2 years ?

ballscrewbob

I don't own a fox but regular MKR's.

However power issues have been mentioned in both the actual MKR section so you may well find some useful info in there.

My suggestion and thats all it is would be to use some form of regulator to ensure you don't exceed the required voltage. That said you could also check the technical specs for the FOX to see if it will allow a little more voltage on a particular pin and maybe use that ?

You could also explore using SOLAR to keep a battery topped up.

Options to power almost all the Arduinos are limitless and that would be up to you to choose something specific for your application of the fox.

Your other methods are down to putting the fox to sleep in your sketch to further reduce consumption which is again mentioned in the other MKR sections.

It may not be the answer you were looking for but its the one I am giving based on either experience, educated guess, google or the fact that you gave nothing to go with in the first place so I used my wonky crystal ball.

astroman35

Ok thanks for your answers. I'll search the MKR section to find relevant informations about power issues and check voltage regulators.

I've already manage to put the FOX to sleep in my sketch between two sensor checks thanks to the ArdunoLowPower library.

MarkDerbyshire


ballscrewbob

#8
Apr 30, 2017, 01:55 pm Last Edit: Apr 30, 2017, 01:55 pm by Ballscrewbob
Then a LIPO at 4.7 fully charged would probably be just fine using VIN.

AFAIK it runs via the regulator on the MKR1000 so you would have to monitor performance once it gets to the 3.3V range.

Thanks Mark.
It may not be the answer you were looking for but its the one I am giving based on either experience, educated guess, google or the fact that you gave nothing to go with in the first place so I used my wonky crystal ball.

Cristiano_Russo

From the Arduino MkrFox1200's specification, it seems that you could apply only 3 Volt on the green screw input. In this case, the internal led remain OFF and also using a lowpower library the consumption of the board is around 700 uA. That mean with a commercial AA or AAA battery the life won't more 2 months (doing nothings !! and not 6 months). If you apply the power from USB or Vin the internal led remain ON and the consumption increase.

For this reason, the initial question of @astroman35 was correct and, sorry but I don't understand the above answers



nimasa

I'm using 2 Alkalike 4.5 V batteries connected in series, so I have 9V output to power up my sensors and MKRFox 1200. I'm using LM7805C to regulate voltage to 5V for VIN.
In documentation page of MKRFox1200, it's written that you can apply between 5 to 6 v to VIN.

Vin: This pin can be used to power the board with a regulated 5V source. If the power is fed through this pin, the USB power source is disconnected. This is the only way you can supply 5v (range is 5V to maximum 6V) to the board not using USB. This pin is an INPUT.

pietervannuffel

I'm feeding my MkrFox1200 a 3.7V Lipo, works fine

edugimeno

If 2xAA batteries "theorically" last 6 months, according to this table:
http://www.allaboutbatteries.com/Energy-tables.html
2xC batteries should last close to 4 times that (2 years) and 2xD batteries should last 8 times that (4 years).
Im using the line that assumes we're talking about long life alkaline batteries (cause I guess we can assume that the sigfox 6 month calculation was done under 2xAA Alkaline batteries)

I know C and D batteries are not so common nowadays but they are still sold and if all you need is them to last longer, why not switchting to them instead of using regulators?



edugimeno

I'm feeding my MkrFox1200 a 3.7V Lipo, works fine

Can you please confirm that it still works fine? A fully charged single LiPO cell will provide 4.2V, is this still fine with your board? I totally need to find a rechargeable solution for a MKRFOX, and then apply a solar panel to charge it

Thanks

pietervannuffel

Still running fine. I use this battery.


Can you please confirm that it still works fine? A fully charged single LiPO cell will provide 4.2V, is this still fine with your board? I totally need to find a rechargeable solution for a MKRFOX, and then apply a solar panel to charge it

Thanks

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