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I have a "USB power bank" with two USB ports, which I use to power some projects. I have discovered that my bank (i.e. your mileage may vary!) shuts off unless my project draws at least 50mA. … This obviously wastes a lot of power (turning it into 1/4 watt of heat), but it keeps the power bank "awake". By using a USB A to USB A, I now have two cables. …

You don't need to reduce the current. 2000MA (2 amps) means the power supply is CAPABLE of supplying this (without overheating). Anything less than this, and your device will work perfectly. …

The Arduino (actually, the chip that runs the Arduino) has brown-out detection - if the voltage drops below a certain level, the Arduino will shut down; if the power comes back up, the Arduino will start … Also, if you are powering the Arduino through the voltage regulator (using the power socket on the Arduino), then you need about 6-7 volt in just to get 5 volt at the Arduino - this causes further power …

There are "sleep modes", which will reduce the power consumption of the arduino - these are one of the best way to reduce power consumption. Delay() may or may not activate these. … If you want to reduce power, check out http://www.gammon.com.au/power - this is an excellent step-by-step tutorial on how to reduce power consumption from 50mA down to 288 µA …

, e.g. a motor, the voltage is will drop - if it drops below the brownout, the arduino will shut down (usually also shutting down the external device, causing the voltage to rise again, causing it to power …

Read the link in @j-g-faustus 's comment - very thorough. http://www.gammon.com.au/power - it starts with a stock board running at 50milliAmps and ends up at 0.002 milliAmps. … You will also need to find out the power consumption for your BT module - this may dwarf the power arduino's power consumption. The same goes for the LED. Normal LEDs run at about (ballpark!) …

There is an excellent article on power reduction at http://www.gammon.com.au/power , but it's definitely worth looking at the parts of your project OTHER than the arduino - that is, your sensor, and your …

From https://www.arduino.cc/en/Reference/Board : The input voltage to the Arduino board when it's using an external power source (as opposed to 5 volts from the USB connection or other regulated power … You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin. …

Yes, someone (not me) has: https://www.youtube.com/watch?v=3-r2Jk0uA6U I doubt it would work very well with non-flying vehicles - in the air, a 3 meter margin of error is fine, on the ground it's the …

There is a very good write-up on how to save power, use sleep mode etc, at: http://www.gammon.com.au/power This includes step-by-step examples of what was done to save power, and how much power was saved …

YOU MUST NOT HOOK THIS UP DIRECTLY to the arduino, connect it to a plug for the power jack (right of the USB connection). … PS - if you draw more power than the serial port is rated for, you will probably destroy the card. In most cases, this will be the motherboard. …

You can plug the power bank directly into the USB port of the Arduino. … My power bank can supply 1.5 Amps, which should be plenty for your project. …

This turns both switches off, and preserves the status quo, and consuming nearly no power. … This means power can flow through the TOP transistor from emitter (top) to base (center/left), switching on the TOP transistor. This allows power to flow from the emitter (top) to collector (bottom). …