Can i use a 5v/1a (output) to power an arduino? I am using a 5v/2a for now and i dont know if the amperes will make a difference. Appart from the arduino i want to power an hcsr04 sensor and some other stuff. I can power all of them using the 5v/2a powerbank.
Hi,
You may get away with the 1A bank, have you measured what current your project will draw?
Current is what the load or your project consumes, the 1A or 2A rating of the power bank is the maximum current it can supply.
Tom.. 
I use a RAV power bank to control my Nano and a stepper motor and (so far) it works great.
sure, but what are its specs?
Did you search for all the threads discussing auto shutoff of power banks ?
Fair enough...my outputs on the bank I have are 2A each. Should you not be able to determine the power draw of your sensors and actuators? I should think 1A is plenty just for the Arduino, but each board spec should also tell you how much it needs. Not quite enough data to provide more solid answers, so TomGeorge's response is most appropriate.
An Arduino UNO has a polyfuse so it will never draw more than 500 mA from the USB cable. The Arduino UNO uses about 45 mA itself. The HC-SR04 ultrasonic rangefinder use so little power (less than 20 mA) that you can power it from an Arduino pin. That leaves you with about 435 mA for 'other stuff'.
This ^^^^^^^^^
yeah, I did, but I still bought one in hopes that it would have a way to shut this feature off, like some other pb that i own. It doesn't. I checked the other threads, but the solutions are kinda complicated for me. I figured this solution, shown in the image, but it doesnt work. Is it wrong, or should i choose different resistors? (I tried 10 ω, 100ω, 220ω, 330ω [all of them got hot, the first one got really hot immediatetaly], 1000ω, 100kω
)
edit: the nano opens, but closes for a brief moment and then opens again. The pb should have a light showing it's on, but it doesn't. It works fine with the uno.
Have you dismantled the power bank? It looks rather naked.
Anyway, the resistor should not be across the 2 cells of the power bank, as it appears to be from your picture, it should be effectively across the output of the inbuilt step up converter. It may be easier to put the resistor between GND and 5V on the Nano. Use no less than 100 Ohms, but the highest you can which still is enough to prevent the unwanted auto shutoff.
Hi,
I did a project for a Halloween project, last year, that ran off a Lipo bank.
I prevented it from switching off by every 20seconds having software switch via a MOSFET a 120R load resistor for about 250ms.
That way it preserve battery life but still keep the bank outputting.
Tom....
i 'll try that and i 'll post the results
edir: i just took out the case of the powerbank and solder the two wires
i didn't understand a single word of this sentence.
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