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Topic: Wants to use Cell button CR2032 for Arduino R3 board (Read 4337 times) previous topic - next topic

hn123

hi all,

I wants to use cell button CR2032 for Power up Arduino R3 board.
 
Specification of Cell button is 3 v 10 ma & required For Uno R3 is 5 V 50ma.

So for Voltage amplification i already used series of two button cell which give me 5 V but for Current amplification i wants to use Current amplifier.

Can is this feasible for this ?

weedpharma

#1
Jan 23, 2016, 08:58 am Last Edit: Jan 23, 2016, 09:00 am by weedpharma
If as you state, the current output is 10mA, then that is it, no more.

A bit like saying your total effort working then make you work 5 times harder.

Weedpharma

Phil-D

Hi

You cannot use the R3 board because it has a rather inefficient linear regulator.

To run on a 3 volt coin cell you could build your own Arduino (minus all the voltage reg stuff) and feed 3 volt in directly, although you will need to use a different bootloader and run it at 8MHz, or keep with 16MHz and run in 6 volt.  A good quality electrolyte cap will help with short term current requirements.

With careful use of sleep mode you can get very low power consumption, for example I have built a remote sensor using AA batteries that has been running for over 2 years. 

The other issue of course is what the Arduino is doing and how much current that needs.

Regards

Phil


Boardburner2

#3
Jan 23, 2016, 09:44 pm Last Edit: Jan 23, 2016, 09:47 pm by Boardburner2
If you used 10 coin cells your board would run for 1 hour.

I notice this is your first post and would suggest you try to learn about Voltage , Current and OHMS law first.

You will get help here provided you are prepared to put in the effort and answer questions.

Cell is 10mAH so will provide 10 mA for 1 hour.
Arduino needs 50 mAH so 5 are needed for 1 hour use.
Twice that no to get the required voltage.


Boardburner2

#5
Jan 05, 2017, 02:41 am Last Edit: Jan 05, 2017, 02:44 am by Boardburner2
My apologies for the earlier post , i tried to explain further but was unable to post.

One coin cell at 3V is Unlikely to be enough , there may be enoughh current hough for occasional use of a sleeping arduino.

I think my keyboard has died.

jlsilicon

I thought CR2032 Lithium have about 240mAh at 3.0V

That would give you about 24 hours at 10mA.



jackrae

Arduino needs 50 mAH so 5 are needed for 1 hour use.
Twice that no to get the required voltage.
"mAH" has to do with battery capacity, not Arduino operating current
So your line should have read "Arduino needs 50mA....."

CyberSpider

Adding batteries in series increases voltage.
Adding batteries in parallel increases amperage (Ah or mAh).

If indeed the battery specs are 3V/10mAh then you would need 5 pairs of CR2032 (2 each in series) connected in parallel to get 6V/50mAh.  Of course, this will cancel any desire for a very small device.

Note that after a little research, I read that the minimum mAh for CR2032 is usually 150, so 2 in series should be more than enough.

Someone here may know more about the numbers than I.

Wawa

Note that after a little research, I read that the minimum mAh for CR2032 is usually 150, so 2 in series should be more than enough.

Someone here may know more about the numbers than I.
Don't confuse mAh with max constant current drain.
The voltage of a CR3032 might already collapse with more than 20mA current drain.
Leo..

Smajdalf

To run common MCUs from a coin cell battery for a reasonable amount of time you need to use some form of sleep mode a lot as well as turn off any other power hungry circuitry for most of time. Arduino Uno is NOT suitable for such task unless you remove nearly everything from it. IMHO the other way is much better - start with a bare ATMega (the brain of Arduino Uno) and add components you are missing from Arduino Uno. This way you can get to VERY low current consumption - in order of single micro-amperes of average current! It is not so hard but you need a lot of knowledge. I was able to do something like that about a year after discovering electronics as a hobby.
How to insert images: https://forum.arduino.cc/index.php?topic=519037.0

jlsilicon

#11
Jul 03, 2018, 04:27 pm Last Edit: Jul 03, 2018, 04:33 pm by jlsilicon
Keep in mind that if you disconnect the arduino VReg and LED, then you can reduce mAh = 3.5mA active / <1mA Sleep
- Of course, you are using the RAW Pin, and Disconnecting the LED and the VReg ...

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ATmega328P Pro Mini Version   PWR Source   State         5.0 V @ 16 MHz   3.3 V @ 8 MHz

 Unmodified                                     RAW Pin             ACT           19.9 mA                4.74 mA
 Unmodified                                     RAW Pin              PDS           3.14 mA               0.90 mA
 No Power LED                                RAW Pin             ACT           16.9 mA                3.90 mA
 No Power LED                                RAW Pin              PDS           0.0232 mA          0.0541 mA
 No Power LED, no Regulator      VCC Pin              ACT           12.7 mA                 3.58 mA
 No Power LED, no Regulator      VCC Pin               PDS         0.0058 mA           0.0045 mA

ACT - Active Mode
PDS - Dower-Down Sleep with Watchdog Timer enabled

- from :
http://www.home-automation-community.com/arduino-low-power-how-to-run-atmega328p-for-a-year-on-coin-cell-battery/

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