Power issue arduino nano

Other Hardware General Electronics
1

Hi all, I am working on a concept where in I want to hook up Arduino nano with couple of sensors such as accelerometer, infrared sensor, Bluetooth module etc. If I power my board with two 3.7V coin cells for how long will I be able to run with every sensor switched on.

2

Your project will need at least 50mA while transmitting. Coincell capacity? (500mAh?)
(or one I found @ thebatterystore: "PowerDisc, PD2032, 3.7V 75 mAh Li-Ion Rechargeable Coin Cell")

so.. a few hours of radio communication. som kind of sleep mode between transmissins may be a good idea.

3

3.7V coin cells? You mean 3.2V non-rechargable lithium coin cells? They only do a few mA (2 or 3 max)
I believe. 3.7V is rechargable lithium (Li ion or Li Po) which I've not seen in a coin cell.

To answer the question one needs to know which cells exactly - they may even have datasheets.

4

knut_ny:
Your project will need at least 50mA while transmitting. Coincell capacity? (500mAh?)
(or one I found @ thebatterystore: "PowerDisc, PD2032, 3.7V 75 mAh Li-Ion Rechargeable Coin Cell")

so.. a few hours of radio communication. som kind of sleep mode between transmissins may be a good idea.

Thank You :smiley:

5

D3vil:
Hi all, I am working on a concept where in I want to hook up Arduino nano with couple of sensors such as accelerometer, infrared sensor, Bluetooth module etc. If I power my board with two 3.7V coin cells for how long will I be able to run with every sensor switched on.

You need to read the Datasheets for every device.
You need to know how many milliamps each device uses.

How many milliamps does each one of these devices use?

  1. Arduino Nano
  2. Accelerometer
  3. Infrared Sensor
  4. BlueTooth module

Then add up the milliamps need for each device = ( Total ma )

Then ...
( Battery mAh ) / ( Total ma ) = Hours of operation

( Battery 75 mAh ) / ( Total 50 ma ) = 1.5 hours

Check out ...

2 @ 18650 Lithium Cells ~ 3 Days*
2 @ 28650 Lithium Cells ~ 1 Week*

  • = Assuming the Mfr mAh Ratings are honest, some are not.
6

MarkT:
3.7V coin cells? You mean 3.2V non-rechargable lithium coin cells? They only do a few mA (2 or 3 max)
I believe. 3.7V is rechargable lithium (Li ion or Li Po) which I've not seen in a coin cell.

To answer the question one needs to know which cells exactly - they may even have datasheets.

PowerDisc, PD2032, 3.7V 75 mAh Li-Ion Rechargeable Coin Cell

Rechargeable_Li-Ion_Coin
.

7

Interesting, not seen a Li-ion coin cell before. Not cheap... Considered using standard alkaline LR44's which
are super-cheap?