How Can I safely power an Arduino Nano with a 3.7V Li-ion battery while keeping all sensors and modules working properly?

Projects General Guidance
21

Is that your only concern?

For sure, using the correct circuit and components the battery can reliably power all these components.

If the battery can power all these components for, say, 1 hour, you will be happy?

I have to tell you that the Nano alone will draw at least 20mA from the battery. The battery has a capacity of 400mAh. Do you know how to calculate how many hours the battery will take to become drained?

22

Conserning using the half battery capacity , The arduino will will run for 10 hours .

23

Thanks for all of you.
i connect the battery with TP4056 charge circuit using B- and B+ and connect the the arduino nano pins GND and V5 with -OUT and +OUT in the TP4056

The arduino works and all sensers and other spaces HC-05 bluetooth , buzzer

Thanks again for you all

24

Keep updated how low (battery voltage) you can go.

25

I realy don't know, I don't have even millimeter to measure voltage .

26

Ask one multimeter for next christmas, definitely worth.

27

Are you not going to ask how you can solve this situation?

  • Use a 3.3V Arduino, not 5V
  • Use Arduino with low power consumption and no extra chips or LEDs that waste battery power
  • Use only sensors that can be powered with 3.3V
  • Put Arduino into sleep mode for 95%+ of the time
  • Read sensors only every 10 or 15 minutes
  • Use battery with higher capacity, for example 2000mAh

This way, the circuit can run for weeks, perhaps months, between re-charges.

28

Be careful you could damage your Arduino

29

The easiest way to power your Nano seems to be this:

NanoOnBattery
NanoOnBattery643×448 676 Bytes

This has disadvantages. The lower the supply voltage gets, the slower a processor can run. The Nano is provided with a crystal for 16MHz. The manufacturer doesn't guarantee proper functioning at 16MHz at 3.7V (though experience shows it will probably work). At some point the board may cease to function properly. The battery can be drained lower than 2.5V and may be damaged (possible fire hazard).

An other problem arises when you connect the board to your computer:

NanoDualPower
NanoDualPower643×596 887 Bytes

Now the battery will charge uncontrolled (again fire hazard).

Real life is rarely easy.

30

But i'm using charge circuit called TP4056 with battery protection built in