I want to know if I may use a multi-cell 2s 2A with BMS 2s to power Arduino Nano.
With the multi-cell, I will be able to put two 18650 in series and the BMS will protect and regulate the charge and discharge of the cells
is that a good ideal
Try this link to know what forum expect to read: How to get the best out of this forum - Using Arduino / IDE 1.x - Arduino Forum
It should work. It will not be ideal.
I am assuming you mean a classic Nano 3.
A better solution would be an Arduino that runs at 3.3V. With this, a single 18650 cell, combined with a low-drop-out regulator, will be sufficient, and more efficient.
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What model is your BMS 2S?
Post a photo or link of the product.
What is its output voltage?
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the multi-cell takes 3 to 6 volts and outputs 8.4 volts that go into the BWS to charge the batteries.
I will use two batteries in series to output 7.6 volts which will be sufficient for the Arduino Nano
Can you power your nano with 5V?
I am currently using this type of charger.
With it you can only use one battery.
Unlike other models, it provides 5V at the output
at any time, even while charging the batteries.
I'm trying to use the Vin pin in the Nano which can only take 7V - 12V
But you can use the nano's 5V pin to power it with 5V.
Nano Schematic:
NanoV3.3_sch.pdf (97.5 KB)
By using the 5v pin to power the nano it will bypass the voltage regulator and if there are any spikes in voltage it will burn the Arduino. I'm relatively new to this so.
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Can a single 18650 with the Arduino Pro mini 3.3v 8M power a 32 by 8 MAX129?
I meant MAX
7219
No, max7219 is a 5V device. It can be driven by a 3.3V Arduino but it needs 5V supply.
Many 18650 batteries sold today have battery protection built in, so a BMS will not be needed with the protected batteries.
If you buy unprotected batteries, then the protection board you show in the first image will work.
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