Hot answers tagged

21 votes
Accepted

Arduino powering from 9V battery

Power consumption The Arduino boards use a fair bit of power compared to other embedded systems with similar functionality. There are three main factors: The NCP1117 (datasheet) 5V linear regulator ...
user avatar
  • 2,886
18 votes
Accepted

Powering Arduino with car batteries

Use a switching regulator such as the LM2596. You can get a ready board from eBay for about US$1. Just set the output voltage to 5 V and feed the Vcc input of Arduino; this bypasses the onboard ...
user avatar
  • 1,740
10 votes
Accepted

How best to power down an Arduino for ~5 minutes at a time?

Yes, if you want to wake an ATMEGA (the chip in the Arduino) spontaneously (no outside trigger) from Power Down mode at periodic intervals, the you will need to rely on an interrupt generated by the ...
user avatar
  • 1,450
10 votes
Accepted

Two batteries sharing ground?

Not only can you share the grounds - sharing the grounds is required for there to be any form of meaningful circuit for signals to get around the place. To copy-and-paste a blog post I wrote some ...
user avatar
  • 101k
9 votes
Accepted

Day-night powered Arduino

This would be better answered on Stack Exchange Electrical Engineering. Also see this question and answers. This is not quite the same and the answers there are OK but less than complete or correct, ...
user avatar
8 votes

What are (or how do I use) the power saving options of the Arduino to extend battery life?

Once your project is working and you need to deploy to "production" environment, you can opt to replace the Arduino with a bare meta ATMega328 or any of the ATTiny family chips. This will get rid of ...
user avatar
  • 232
7 votes
Accepted

powering the arduino uno

The Arduino Uno is not really designed for that. Simply keeping the power indicator LED, regulators and extra circuits on for a week will require in the order of 1500-2000 mAh (10*24*7=1680mAh). That ...
user avatar
  • 7,811
7 votes
Accepted

No power from Breadboard Power Supply Module

I'm not surprised you can smell burning. You have the power supply connected backwards. You see that little + and - symbol next to the ON/OFF jumper? That's the polarity of the two runs of pins. You ...
user avatar
  • 101k
7 votes
Accepted

Battery solution Nano 33 iOT

You can either use the 3.3V pin to supply power to the board, or use the Vin pin. By using the VIN pin to power goes through a (step down) voltage regulator, that provides a nice stable 3.3V to the ...
user avatar
  • 11.1k
6 votes
Accepted

Bootup on lower power not functioning

So... turned out what was happening was all in code. Turns out that I was initializing an interrupt on INT0, when it was low, at the very beginning of my code. Problem was that when it started up on ...
user avatar
6 votes

How to power an Arduino using automated mains/rechargeable battery switching?

Yes, charging a battery and supplying an Arduino at the same time is possible as long as we manage the caveats (see below) of in-circuit charging. This is what I use: a 3.3V Arduino (a Pro Mini in ...
user avatar
  • 389
6 votes
Accepted

Powering from 3V coin cell to VCC, using I/O pin as supply GND

Can I use a I/O as (input/supply) GND? You can use an I/O pin as a supply for another (low power) device, but you should power the Arduino itself from its Vcc and GND pins. I could use the reset ...
user avatar
  • 35.5k
5 votes
Accepted

which is the most efficient way to save power with battery using Arduino UNO?

There is an even greater article on this topic: http://www.gammon.com.au/power It shows how to reduce your power usage for the Uno from about 50mA to 350nA (0.000350mA) - at this point, you need to ...
user avatar
5 votes
Accepted

Simple LED circuit is not working

What connects the resistor to the LED? Absolutely nothing. It's hard to work out which holes the LED is plugged into, but I think your current circuit looks something like this: You need to connect ...
user avatar
  • 101k
5 votes

Controlling a DC motor with an external power source

Seeing as you want to use a 12V battery, you should try an external motor controller. You would essentially connect the Arduino to the controller, then the external battery and motor to the controller....
user avatar
5 votes
Accepted

NodeMCU power consumption measurement and DeepSleep

An ammeter is basically a small resistor in series over which the voltage drop is measured. That resistance will play a part in the effective output impedance of your power source (battery). This ...
user avatar
  • 101k
5 votes
Accepted

How to read high voltage (40-65v) from a Solar Battery bank

You need a voltage divider with resistors that have large values. ...but with all values I have tried one resistor almost melts as soon as you connect to battery. This suggests that you have been ...
user avatar
  • 3,042
4 votes

Bootup on lower power not functioning

Exactly what is happening and why cannot be determined based on the amount of info provided. However, I see at least one potential problem which would at least partially explain the symptoms described....
user avatar
  • 508
4 votes
Accepted

Arduino ADC Reference Voltage if it is Battery Powered

... won't the ADC reference voltage constantly be dropping with the battery? Yes, which is why you either use or measure an internal bandgap reference instead. Use the analogReference() function to ...
user avatar
4 votes

Extend battery life with a power-controlling microcontroller?

Switching off power to the board only makes sense if you're using a full Arduino. Once you strip the Arduino down to the bare MCU and decoupling capacitors (or start with a basic breakout board ...
user avatar
4 votes
Accepted

Most power efficient way to constantly save 2 kilobytes of data per second

There are two constraints here, and I think it might back you into a corner. Size and then power. 2Kbyte/s is 2*60*60*24/1024 = 168.75Mbyte/day. This is a lot. The only readily available technology ...
user avatar
  • 5,170
4 votes

Did I burn my Arduino UNO?

To make sure all pins are responding you could put all your pins as input with internal pull-up except pin 13 which must be set as output. The on board led is connected to pin 13, so when you put ...
user avatar
  • 386
4 votes
Accepted

Implementing Quasi-Perpetual Battery on Arduino

You're overthinking it. Use one or more solar panels, a harvesting IC with sufficient storage, and the bare MCU and peripherals. Use enough panels and storage to run the MCU and peripherals 24/7, and ...
user avatar
4 votes
Accepted

Create a Li-Polymer Battery Charger

(1) A simple method BEST method is to use a proper charger - they are not high cost if you look around and doing it properly extends precious battery life. Next best in this context is my "better&...
user avatar
4 votes
Accepted

Remote temperature and humidity sensor with long battery life

I made a Temperature and humidity sensor - battery powered in 2013. It is powered from 3 x AA batteries, and lasted, as I recall, until a couple of months ago before I changed the batteries. That is, ...
user avatar
  • 35k
4 votes

powering the arduino uno

You will definitely not get a week out of a 9V cell - they have very small capacities (and are expensive relative to other types of cell). Your Uno already has a regulator in it and this regulator ...
user avatar
4 votes
Accepted

ESP8266 Battery Monitor

There are two things you need to measure the battery of the system that is doing the measuring of the battery: An analog-to-digital converter Some form of fixed voltage reference to compare the ...
user avatar
  • 101k
4 votes
Accepted

Can I power my Arduino Uno with a 9V / 990mAh battery?

While this answer addresses the specific question it should also prove useful as a link to resources relating to current reduction in other microcontroller projects. Short: The "C" rate for a cell ...
user avatar
4 votes
Accepted

How do you figure out an efficient battery setup for a project?

Our beloved admin Nick Gammon has made a very neat articile on this subject, I suggest you read it and apply as many of the methods he described. Also, it can be worth to check the requirements of ...
user avatar
  • 2,676
4 votes

Are any Arduino boards especially suited for low-power operation?

Technically you can use any arduino for that purpose with some modifications. I recommend to go with an arduino Pro Mini and remove the LED and the voltage regulator. But if you don't need so much I/...
user avatar
  • 668

Only top scored, non community-wiki answers of a minimum length are eligible