HELP with PowerBank ...and 5 volt output ?

[ropa101]

Help with powerbank for mobile phones ... who knows them well?

I would like to understand how the various PowerBank work for mobile phones ....

Let me explain better, I wanted to feed a classic flashing light with
The usual IC Timer 555 and an LED diode, all of 5 volt.

Except that I connected it to the 4 different powerbank that I have but nothing, off !!!

With the tester in fact I read from 2 to 3 volts out of the way ....

If, however, the various keyboards, a miracle, the 5 volt and the circuit comes out
Outside it works!

Only then after a while ... everything goes out and the 5 volts still disappear.

So there must be something to do on the connector for I believe
make Powerbank understand that there is an external load and to continue
To give the 5 volts out of the way, right?

But how should I do, maybe some resistance ... but where?

help .... who knows more? Thank you for help me

[sterretje]

Please make up your mind if you want to post in the English sections of the forums or in the Italian section of the forum.

Cross-posting is against the forum rules as it wastes peoples time; even if you post in a different language in a different section.

[6v6gt]

You can also search using Google etc. for the following phrase: "arduino power bank autoshutoff" to see some tricks for using these as a general power supply.

[kmin]

@ropa101

But how should I do, maybe some resistance ... but where?

Many power banks have current sensing circuit, so if the draw is too low they switch off.
Try with 200ohm resistor between 5V/Gnd. If it's not enough, add another..
Obviously it's not efficient circuit for the battery life.

[Datman]

Using Arduino, you can simply activate an output for a moment, driving a transistor or a mosfet and a resistor.

[6v6gt]

Here is a thread on this site which discusses a solution for a specific power bank. There are many such examples around. Powering the arduino nano with a Power bank