Questions tagged [power]

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

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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 ...
45
votes
2answers
53k 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 ...
3
votes
2answers
2k views

Setting 10 RGB Strips Independently from Single Arduino

I want to control 10 different 12V RGB LED strips independently from a single Arduino. As a clarification - I've setup a bunch of NeoPixels and understand how to wire and control them independently. ...
1
vote
1answer
3k views

Powering an Arduino with more than 5 V

Last time, when I supplied 12 V from a power supply to the Arduino's 5V pin, it blew up. This time I'm going to use an adapter. Why does an adapter with a 12 V input not blow an Arduino up, ...
19
votes
1answer
28k 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 ...
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 ...
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 ...
4
votes
1answer
5k views

How to switch an external circuit with Arduino?

I have an object with a series of led and I want to turn on and off these leds from my Arduino. The input of the LED circuit is 24v DC 100mA. What I've done is the following: I've cut a wire of this ...
5
votes
4answers
21k 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 ...
3
votes
2answers
5k views

Arduino Power - DC adapter

I have a 12V 2.5 ampere Dc adapter.Can i use it to power arduino uno board? It says on the arduino website that i can use 9-12V and upto 1 ampere. I am concerned with current limit here..
1
vote
5answers
4k views

Arduino Mega and other modules power consumption

I have an Arduino Mega 2560 to which I have connected: Arduino GSM Shield 2 Waveshare 10 DOF IMU sensor Waveshare NEO-7M-C (B) GPS module HC-05 ZS040 Bluetooth module I am feeding my Arduino a 12V ...
0
votes
1answer
163 views

Motor Shield not giving full power, LED DIMS

I have an Adafruit Motor Shield, the V1. I have been using this thing with my OPSEPP Uno and a stepper motor with no issues. (Powered by 12v DC wall wart [CASIO]). My question, or issue, not sure yet,...
29
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 ...
17
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?...
9
votes
3answers
836 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 ...
15
votes
4answers
69k 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 ...
4
votes
1answer
12k views

AC ceiling fan speed control using arduino Uno R3

How can I control an AC ceiling fan speed using Arduino Uno R3? I cannot understand the key behind controlling AC voltage using Arduino (though I know how to on/off ac appliances using arduino and ...
2
votes
2answers
2k views

Low Power Pin Change Detection (ATtiny)

I want to use an ATtiny as data logger for the opening and closing of a door/window. For that I am using a reed-switch. Since I want to run it from a 3V coin battery, long term power consumption is ...
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 ...
3
votes
4answers
5k views

Two arduinos one power source

I was surprised that this question had no answer on Stack Exchange and I can't find much about it elsewhere so, in the hopes that it will be useful to people other than myself, I'd like to ask: How ...
2
votes
2answers
2k views

Is supplying 5V from both external 5V and USB harmful?

I have an arduino nano which is powered through unregulated 5V (pin 27). For debugging purpose, I'd like to connect the USB port to my computer in order to use the Serial.Print function. The external ...
2
votes
1answer
126 views

Powering an Arduino UNO through 5V

I have a bench supply which I can use to power a breadboard at 5 V. Is it a bad idea to power the the Arduino by going directly to the 5 V pin? It sounds like both this method, and the USB are ...
1
vote
2answers
446 views

On the Uno, why does VIN require 7-12 volts and the USB only 5 volts?

I'm just wondering why the VIN would require 7-12 volts when the USB port itself only requires 5 volts? What happens if you power an Uno on VIN with 5 volts?
1
vote
1answer
665 views

How to make battery last for months?

I have a simple circuit: detect that a person is walking towards the circuit (with HC-SR04), measure distance, light diodes (a wave effect) according to that distance – the closer, the faster the led ...
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 ...
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 ...
5
votes
1answer
92 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, ...
3
votes
2answers
2k views

Can I safely connect my original Arduino Uno to a 19V adapter?

I have an original Arduino Uno R3. According to the specifications the recommended input voltage is 7 to 12 Volt. However, I have a laptop adapter of 19V that I want to use to power my arduino ...
2
votes
1answer
728 views

“tamper” circuit of a reed switch: can I connect the two wires to an INPUT and an OUTPUT pin?

While working for the automation side of my new house, I'm currently in the process of installing several reed switches on top of external doors and windows. Even if this could be used as a "...
2
votes
1answer
240 views

Does a moisture sensor need warm-up time?

I am trying to use a moisture sensor to identify the moisture value of my plants. (As every one does.) The sensor was connected to VCC all the time and my battery goes empty after a short time. So I ...
2
votes
4answers
994 views

Power suply for MicroSD card breakout board

I'm developing a project and I need to connect to my Arduino Mini with a SD card breakout board. The problem is that I can't plug it directly to the Arduino since it is already powering some sensors ...
2
votes
2answers
263 views

Deviation of power consumption between datasheet and real world?

According to the Atmega328P-PU Datasheet (side: 589) the current consumption of the microcontroller should be around 9.5mA (at 16MHz and 5V). But I measured 15mA. (Nick Gammon who did some pretty good ...
1
vote
2answers
2k views

Run 5V/2.3W water pump on Arduino Pro Mini 5V

I want to build up my automatic water pump with an arduino pro mini 5v and a 5v usb water pump (2.3 W). As I understand, I cannot power the pump directly through the vcc pins of the board, right? ...
1
vote
0answers
40 views

LEDs interfering with analog sound detection

My project is a sound reactive LED display on an Arduino Nano. There are 112 WS2811s in series connected to 5v, Gnd and D5 via 220ohm resistor. I have a Keyes style sound detection module that has an ...
1
vote
2answers
264 views

How come my transistor doesn't work?

I have a TIP 120 to 229 NON 60V 5A transistor I'm trying to use it to switch an electro magnet. Using the blink example to test it out: // the setup function runs once when you press reset or power ...
1
vote
2answers
458 views

Directly powering a single 32x16 RGB LED matrix (without external PSU)

All the guides I've found suggest to use an external PSU to power an RGB matrix like this. However I know it is possible to blink the LEDs at high rates (eg. 2ms) and still give the impression to the ...
1
vote
2answers
55 views

Leonardo - always on power, status remains between computer reboots?

I'm looking for two answer here. Is it possible to power a Leonardo to be always on, separate from the power from the USB host - I've tried with a full size Leonardo and a power adapter but for some ...
1
vote
3answers
824 views

Analog input draws current when Arduino is turned off

I am using a Arduino Pro Micro from SparkFun (similar to Arduino Leonardo, cpu: Atmega 32u4). It has a analog input: A0, which I use to keep track of the battery voltage in my battery powered project (...
1
vote
2answers
16k views

NodeMCU power consumption measurement and DeepSleep

I'm working on a project using a nodeMCU using a ICR14500(3.7V and 700mAh) battery and I'm experienced some issues when I try to estimate the total current consumption. Firstly I experienced some ...
0
votes
2answers
550 views

Pro Mini 5v with Adafruit motor shield v1 power sharing problems

I am trying to convert a RC car into autonomous car using Arduino Pro Mini 5v 16 Mhz. I have done this with UNO and Adafruit motor shield 1.0 with 4 gear motors and one micro servo for mounting range ...
0
votes
2answers
1k views

Why can I power an SD card reader from a digital pin?

I'm trying to understand the power requirements of an SD card. I have a cheap breakout board from eBay that includes built-in level shifters, so I can plug it in directly to my Arduino. I provide ...
0
votes
1answer
184 views

How can i provide enough power on an UNO to use the HC-12 wireless module?

Scenario: The Uno is being powered by USB for programming, and the HC-12 wireless communications module is wired correctly. But it will not work. In reading through the web literature, it is ...
0
votes
1answer
916 views

Wemos D1 doesnt drive Relay [closed]

I recently bought a Wemos D1 board and tried to connect a relay and test its connection. I got an example server from here and executed. I connected D5 to a Relay's data and 5v and GND from Wemos ...
-1
votes
1answer
3k views

ESP8266 proper power circuit for avoid reset issue [closed]

I am using an ESP8266 in a project which will be on for at least 18 hours a day. I'm using an Arduino 3.3V power supply to feed the ESP8266. The issue I'm facing is a reset issue. It sometimes ...
-1
votes
2answers
3k views

What is VREF pin?

Was searching for some help on connecting Flir camera w/ Lepton board to arduino and found this thread for power you can reroute the 3-5V to the VREF pin, then you have a nice clean solution. You ...