Questions tagged [power]

This tag is for questions regarding powering and/or power consumption of Arduino systems.

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45
votes
2answers
54k views

What happens if I power the Arduino with both the USB and external power voltage simultaneously?

I am a new Arduino user. I am not sure whether I can connect both USB and external supply through power adaptor to Arduino simultaneously. Would this burn the controller? Basically, I want to ...
40
votes
4answers
9k views

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

For solar & battery powered projects, decreasing power consumption is a necessity. I know a little bit about using a timer and interrupt to put the microcontroller into sleep when it isn't doing ...
30
votes
14answers
45k views

Most compact method of powering Arduino from wall socket

There are a lot of methods to power an Arduino from a large range of voltages: USB cable from PC or from a phone charger or an USB hub step down converters step up converters switching power supply ...
27
votes
2answers
10k views

Arduino USB Power vs External Power Supply

Why is the Arduino able to accept ~5V from the USB, but requires a min of 7V when using an external power supply?
19
votes
1answer
29k views

ATtiny85: Power consumption vs clock speed

Short and simple: What is the power consumption for an ATtiny85 running at 1 MHz and 8 MHz using the internal clock? Not using any sleep modes. I have googled a lot and can't find any info on this. I ...
18
votes
6answers
14k views

Powering Arduino with car batteries

Presumably, one powers an Arduino board with car batteries for long-term operation away from the power grid. How can this be done, and what are the most (1) economic, and (2) reliable ways to do this?...
16
votes
3answers
13k views

Arduino powering from 9V battery

Yesterday afternoon I have left my Arduino running on a fresh Alkaline 9V battery (+ connected to Vin, - connected to GND). Today morning (16 hours later) the LCD display was no longer visible, and ...
16
votes
4answers
70k views

What is the maximum power consumption of the Arduino Nano 3.0?

What is the maximum power consumption (in mW) of the Arduino Nano 3.0, when it is running in its default state (at 16MHz, no LEDs removed) and powered by an external regulated 5V supply so it bypasses ...
13
votes
3answers
6k views

Why is the regulator very hot?

We have an LED strip connected to output 6 and is powered by the Uno board itself. Shouldn't be drawing too much current, only have 10 elements on the LED strip. While this LED strip is connected to ...
12
votes
2answers
8k views

Powering Arduino with Solar Panels

Clearly, an Arduino can be powered with solar panels. What is the most optimal configuration? Can you recharge and discharge at the same time? Is LiPO the best battery cache technology, or is there ...
11
votes
2answers
19k views

3.3V, 5V and 9V pins on Arduino

On my Arduino Uno R3 and Arduino Mega R3, there are 5V and 3.3V pins. However on this page Introduction to the Arduino Board, there is a 5V and 9V pin but no 3.3V pin. The page at Arduino: What ...
11
votes
4answers
4k views

Powering Arduino Uno from 5V pin, what exactly is the voltage range/tolerance?

I want to bypass the onboard regulator and use the 5V pin to feed arduino with external, regulated source. Everybody just keeps saying regulated 5V, but how precise does the regulation need to be ...
9
votes
2answers
2k views

very lightweight low power microcontroller with memory?

I have build a couple of projects using arduino. For a new project I want to log skin surface temperature vs. time (just perhaps a few times per day) and possibly other easy to obtain info such as ...
9
votes
4answers
2k views

Turn Arduino on with timer every 24h

I'm currently working on an Arduino project that sends the charge of my car battery once a day via an ESP8266 to me. During the winter I don't drive my car, and I would like to get informed when the ...
9
votes
3answers
841 views

Programming many Arduinos simultaneously with a wireless broadcast

I will have many microcontroller-based devices which will be independent from each other, but all will run the same program. I would like to upload a program to all of them at the same time with a ...
8
votes
2answers
7k views

Reading a varying voltage into Arduino

Using an Arduino Nano and a current transformer (CT), I'm trying to sense the current flowing through a 120 V 60 Hz line. Circuit CT outputs 0-1 V according to its specifications....
8
votes
4answers
2k views

Leonardo (32u4): ways to brick it programmatically

When the Leonardo was introduced, I think, I've read some articles about being cautious to do some things, that could cause it to not load any new sketches any more, so one has to rewrite the ...
8
votes
1answer
281 views

Will the arduino power autoselection logic short the regulated 5V and the USB 5V?

From the reference design of the Arduino UNO r3, I find that USBVCC will be connected to +5V via mosfet T1 if Vin is below 6.6V. Doesn't this short the two sources if Vin is just below 6.6V? The ...
7
votes
6answers
13k views

If the USB gives 5v, how can the Arduino supply 5v to the 5v pin? (And another question)

I must not of understood something. Online, I've heard that the Arduino uses 9v typically (average), and that USB's in general supply 5v@500mA. If this is true: How can the Arduino even POWER ITSELF ...
7
votes
5answers
27k views

How to remember variable values after rebooting an Arduino Uno R3 board?

Is there any way to store the values of necessary variables somewhere (may be in a file that gets updated by the program at various events), which can be read back when program starts after rebooting ...
7
votes
3answers
3k views

How to stop Arduino from drawing power through USB

I'm working on an embedded project, where I use arduinos as a "sensor shield" for RaspberryPi (I have model B). The problem is, that the RaspberryPi's USB port is not powerfull enough to drive WiFi ...
7
votes
2answers
2k views

I fried the AMS1117 voltage regulator on my Arduino Clone, is this the cause?

I had the 12V DC power jack plugged-in all the time, and "to make things more exciting" I also plugged-in the "data" USB whenever I had a new sketch to upload. Is this combination a big no-no, or is ...
6
votes
5answers
3k views

Does a delay in a loop save energy?

I've noticed most example snippets always have a delay in the loop even if it's not needed for proper execution of the program. I can only assume this is added because people copy and paste without ...
5
votes
4answers
607 views

Briefly “wake up” Arduino in response to an event

I want to connect a device to a door handle, so whenever someone opens the door I'll be able to send a message via my arduino that is connected to a WIFI shield. I have a simple orientation sensor, ...
5
votes
6answers
10k views

Lowest power possible in Arduino

I have googled all around and I know about some tricks to make ATmega328 not being a power hog. I am using Arduino Nano V3.0. However, I didn't find out what is the minimal consumption possible with ...
5
votes
3answers
4k views

How to know positive and negative in breadboard

I have this breadboard, and there is no indication on it about what is positive/negative on it. In comparison, this other breadboard (pic from the internet) DOES have indications: Can anyone give ...
5
votes
1answer
2k views

Low Power library messing up serial text

I noticed something unusual using the Low Power library today. When printing text in the loop and using LowPower.powerDown(SLEEP_1S, ADC_OFF, BOD_OFF); to sleep for one second, all the text in the ...
5
votes
1answer
6k views

Can I use an external power supply and still communicate with my computer over Serial?

I read the following online: If you plug in both USB power (say from a pc) and external power via the 2.1mm jack, the Arduino chooses power source automatically. If the external 2.1mm DC is providing ...
5
votes
4answers
22k views

Power bank turns off spontaneously

I currently have a 50,000 mAH USB power bank powering my Arduino Uno and micro servomotor. Unfortunately, my power bank has an automatic shutoff and shuts off after 2 hrs of runtime (I need 16 hrs for ...
5
votes
2answers
17k views

Why does an Arduino UNO need two GND ports?

I have really bad eyesight, so whenever I plug in the power wire and the GND wire I always double check if I'm actually plugging in to the power port not one of the two GND ports. Why does an ...
5
votes
3answers
1k views

How to power my Arduino mini using wall socket?

I am trying to power my Arduino Mini (which is connected to IR receiver and a relay board). The idea is to hide the entire setup behind the electrical board including the power supply. I have hacked ...
5
votes
2answers
281 views

Controlling mains (230 V) supply up to 5/10 amps using Arduino

I am looking for a simple, low cost solution to control on/off of mains supply to certain equipment. The control will be done using one of the output pin of Arduino Uno. The input trigger and how to ...
5
votes
1answer
2k views

No power from Breadboard Power Supply Module

Components Breadboard Power Supply Module IM120525004 1 kOhm resistor Green LED Arduino Nano LiPo 7.4V battery LED Lights Up Fine with USB power from the Arduino LED Does Not Light Up with power ...
5
votes
1answer
94 views

Converting a standard setup/loop sketch to a low power application?

Suppose I have a typical setup/loop style sketch, such as this one which turns on an LED when a button is pressed. How do I modify this so that it enters low power mode, awakes on the button press, ...
5
votes
4answers
11k views

Can I have backup power for an Arduino device?

I have an arduino project that will work while plugged into a generic outlet. But I want to connect a battery in case the power goes out. I know there are various power sources (coin cell, polymer ...
5
votes
3answers
108 views

Powering an USB to Serial from USB

I am creating a PCB which is a modification of the Arduino on a breadboard. I am intending to buy an USB to Serial breakout from Adafruit so that I can upload my sketches to the atmega 328 I'll be ...
5
votes
4answers
418 views

Why/when to use IoT publish/subscribe protocols rather then RESTful HTTP?

I am sending data (GPS coordinates) from Arduino once a minute with HTTP POST request to REST API (in OpenShift PaaS). Data is then stored to MySQL db. Would so called "IoT" publish/subscribe ...
5
votes
2answers
787 views

Arduino power sources

Is it safe to connect a USB input to an Arduino (Nano) at the same time as an external regulated 5V supply to its 5V pin is connected, assuming the supplies have common grounds ? Will (I hope) the ...
5
votes
1answer
660 views

Powering fans and arduino pro mini from single 12v supply

So, I have a 5V Arduino Pro Mini, which is running the logic behind a multi-DHT22 sensor array, and using that input to control a 12v 24mm fan (12v, 0.16 A). This is currently a working board on an ...
5
votes
1answer
329 views

Powering 5V Accesories

I'm using an Uno to control NeoPixels LED strips (60 per metre). These are powered with a 5V DC supply. Now, when using USB to power the Arduino it works lovely. However I want to move the Arduino ...
5
votes
3answers
1k views

Using multiple laptop battery packs to power everything

I'm working on a medium sized robot project with multiple arduinos to control stuff. I've been planning on using a lead-acid battery pack, but then I was given 10 working and identical Asus laptop ...
5
votes
1answer
5k views

How to optimise TX power for ESP8266?

I have multiple ESP8266 units programmed using Arduino SDK and I would like each one of them to adjust the transmission power to lower the power requirements. Arduino allows setting the TX power of ...
5
votes
1answer
543 views

Uno with LCD acting strangely - power issue?

I've got a Uno (Elegoo UNO R3) running with - Ethernet shield (Kuman K15), - 4 relay board (Elegoo 4 Channel DC 5V Relay Module with Optocoupler ) - Matrix Orbital 2041 LCD connected via I2C (11mA ...
4
votes
4answers
234 views

Send out a short signal every 10 seconds to an arduino

In order to reduce power consumption, I want to resume my Arduino from standby mode every 10 seconds. For this a hardware interrupt is necessary. Is there such a device that can create a quick ...
4
votes
2answers
2k views

Can I force Arduino Not to be powered by USB?

I'm building a 3D printer and I'm using a Atmega2560 + RAMPS board. The whole thing is powered by an ATX PSU (12v for motors and stuff, 5v for the Arduino), but when I plug in my USB cable, I can't ...
4
votes
4answers
9k views

How to power an Arduino Uno with 3 1.5V batteries?

I have an Arduino Uno (a SainSmart model, actually). I intend to power it with three 1.5V batteries. I measured them and they yield 4.67V in total. The Arduino requires 5V. The question is, if the ...
4
votes
3answers
36k views

Powering up LED strip - How many amps?

I want my Arduino to drive a LED strip. The LED strip in particular is the 3528 non-waterproof type. To power this up, I need a 12V power supply. My LED strip is going to be 5 meters. Now my ...
4
votes
1answer
17k views

Will 5V 2A current input to the power port kill my Arduino? [duplicate]

I want to power my Arduino with a mobile charger, the out put is 5V 2A, will it kill my Arduino? And what's the max input current as power source?
4
votes
3answers
11k views

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

I'd like to power my Arduino circuit like a smartphone. That is: When the device is unplugged, power by rechargeable battery When the device is plugged in, power by mains and charge battery at the ...
4
votes
2answers
9k views

Do I need to supply the 12V connection to an HDD

I'm working on trying to control a hard drive with an Arduino Uno, but I'm having trouble with the power supply. From what I know, both the Molex Mate-n-Lok and the new SATA connectors both have 2 ...