This tag is for questions regarding powering and/or power consumption of Arduino systems.
1
vote
2answers
58 views
Very strange power supply problem
So, I've put together my Christmas tree lights - a string of WS2811s driven by my Uno board. They are 12 volt WS2811s, so I have rigged a 12 volt supply to them and just using the Uno for the data ...
0
votes
0answers
15 views
Arduino mini + HC-05 small power source?
I'm a little confused about the Arduino Mini. It's small so that you can incorporate it into small devices, and yet the official website says it requires a 9V battery (obviously large) or a steady 5V ...
0
votes
2answers
47 views
Most efficient method to turn a gear extremely slowly?
I have a gear that needs to have roughly one rotation per day. It does not have to be smooth or consistent. So far, the best I have come up with is to have a stepper motor with an arduino that ...
1
vote
1answer
61 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 ...
3
votes
1answer
48 views
Mega 2560 & smoking/burning 5v requlator, probable cause?
Problem: board seriously fried.
Desired outcome: measures to take in future.
Background:
This project has been running for about a week on the 2560, and previously for a few weeks on an UNO clone. ...
3
votes
1answer
82 views
Can you tell me if this circuit will work?
Here's an image of my circuit diagram. There are 8 9g servos connected to the arduino gpio pins. The servos have an external power supply of 3 volts (may vary depending on the voltage requirement of ...
1
vote
1answer
46 views
Waking up async the Arduino while it's sleeping periodically
The solution is below.
I´m using LowPower.h and PinChangeInt.h libraries to put my Arduino into the sleep mode every 8 seconds and then it wakes up, modifies a counter and it goes to sleep again, but ...
3
votes
2answers
59 views
Turn Arduino ON with timer every 24h
I'm currently working on an Arduino project which 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 ...
0
votes
1answer
28 views
what boards have integrated USB charging?
I've been building wearables, using the adafruit trinket, which I love, its small size is easy to tuck away. but I hate having to unplug the battery to charge it every time. I wired in a SPDT switch, ...
1
vote
1answer
50 views
Will a transistor always reduce the voltage? [closed]
I have an NPN transistor that's connected over a 12V adapter. I have tried using a potentiometer to change the resistance of the incomming current. Even if i take the resistance down to 0, I end up ...
0
votes
2answers
48 views
Power an arduino on a 12V circuit
I am doing a simple circuit with a 12V power supply to power a 12V LED strip. I'd like to be able to switch ON/OFF the strip with a relay connected to my Arduino. I'd like to know if I can power my ...
0
votes
1answer
49 views
Shared 5v power for Due dedicated application
I would appreciate input on this situation:
I plan to power a fairly high current, 5 volt supply, 3.3v signal, device from a suitable wall wart. I would like to power the due that controls it through ...
-1
votes
1answer
21 views
Measure voltage of data output?
I'm trying to control a few NeoPixels using a 3.3V Particle Photon.
I've got a 5V power source that I'm using to power the NeoPixels (as they require that voltage. That works fine.
Them I'm using a ...
3
votes
1answer
64 views
Why is my transistor always transmitting?
I want to use a transistor to turn on and of an electric magnet, I have hooked up a transistor like this:
simulate this circuit – Schematic created using CircuitLab
The blue wire goes to the ...
1
vote
0answers
39 views
which Arduino UNO ethernet shield supports power over ethernet?
I ordered for this ethernet shield for my UNO as shown on the amazon website listing
I was thinking to add power over ethernet module to take advantage of shield that supports adding POE module.
.
...
2
votes
1answer
27 views
How do I hook up a 3V device to a 74AHCT125 (Quad Level-Shifter)?
I have this level shifter that I'm trying to feed a 5V power source and then hook up a 3V device.
I've got the 5V source hooked up fine (on the top pinouts), but having trouble figuring what the "...
0
votes
3answers
41 views
How to ground a arduino with an external power-source?
I have magnet hooked up to my arduino with a Darlington Transistor, like this:
The powersource is a 12V adapter
I'm pretty new to electronics but i'm told that the transistor won't work unless the ...
8
votes
2answers
971 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 ...
1
vote
1answer
44 views
Aptotec PN532 shield power consumption
I am currently planning a battery-powered project, where one of the tasks involves reading Desfire EV1 tags. Since the cheap RC522 based NFC shields are reported not to work with the Desfire EV1 tags, ...
1
vote
0answers
72 views
ATMega328 not able to fully switch coreless motor on
I'm having trouble regarding motor control in a project I'm working on.
It uses an ATMega328 DIP package on a PCB. The motors I'm using are small coreless motors and I'm trying to control them using ...
-1
votes
2answers
78 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
1answer
45 views
Arduino Micro Power Questions
I have a few questions about the Arduino Micro circuit:
If I can provide a steady 5 V source (connected to +5V), then I don't need to use the voltage regulator module (including the selector) of the ...
0
votes
1answer
25 views
Gnd pins at the power pin strip VS Gnd pin at the IO pin strip
I noticed there are two Gnd pins at the lower pin strip, and another on the upper strip.
Is there a difference in their purpose?
3
votes
2answers
52 views
Reading the DotStar datasheet - power requirements
I'm trying to figure out my power requirements for a strand of Adafruit DotStar LEDs - APA102 Cool White, not the RGB. I'm not sure how to interpret the datasheet.
In the middle of the product spec ...
-1
votes
1answer
72 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?
3
votes
1answer
123 views
Using two pins to sum maximum available current
I have a theoretical question about using digital pins of arduino. The specification of Arduino Uno (or any other I guess) says, that maximum current from digital pin is 40mA. If I would need more ...
1
vote
2answers
57 views
Can I power two 5V with Arduino powered with 9V power adapter?
I have a setup where I have a 5V IR receiver and 5V relay board and Arduino Uno.
I am currently powering the Arduino from the PC USB and both the IR receiver and the relay board from the Arduino. ...
0
votes
1answer
64 views
How to power two stacked motor shields with one 3S Lipo battery (11.1V)?
I have these 2 motor shields:
Adafruit Motor Shield V2 and
Seed Motor Shield V2.
They are stacked on top of an Arduino UNO.
My question is, how can I power 2 of those motor shields with one 3S Lipo ...
1
vote
1answer
177 views
How do I turn off a 12V 3A RGB LED strip?
I'm trying to understand how to control an RGB LED strip, I set up all the TIP120 (because I could get my hands on an n-channel mosfet), if I power everything in this way I can change colours and ...
1
vote
0answers
35 views
Arduino code not starting at beginning after poweroff
I created a few Arduino-XBee temperature sensor nodes that send data to another XBee node.js server. I'm running into a few issues trying to write a function to initiate a handshake and receive an ...
0
votes
1answer
65 views
9V Vin powered Mega - 3V instead of 5V
I'm experiencing an issue with an Arduino Mega 2560 :
I powered the board through the Vin using a +24 --> 9V voltage regulator. When I power the board and measure the 5V output from the board, the ...
1
vote
1answer
55 views
Is it possible to power this 12V Wind Speed Sensor with a 5V battery?
I have a battery pack used to charge mobile phones. It's capacity is 13,000mAh and it has two output ports. Both are 5V but one is 1A and the other 2.1A
It also has an Input port of 5V 1A. (To which I ...
0
votes
1answer
62 views
How to turn I2C Sensors on and off with an Arduino Mega 2560?
I want to turn on and off I2C Sensors with the Arduino Mega 2560.
I use one max. 0.4A NPN Transistor, which controls the Vcc line to the sensor.
When I plug my Arduino into my laptop and the sketch ...
2
votes
1answer
67 views
Powering ESP8266 from Leonardo's 3.3v pin
I'm new to Arduino, and I'm trying to connect my Leonardo via WiFi using a ESP8266 module. What I want to know is if I can power it directly from the onboard 3.3V pin like in the image:
Or do I need ...
2
votes
2answers
64 views
Is it safe to use the same power source for Arduino and its Motor shield?
Is it safe to use a unique 12V 5A DC power source to feed both Arduino and its connected Motor shield, provided that
the motor (connected to the shield) will eat 3A maximum
the Arduino Vin will get ...
3
votes
1answer
68 views
Design considerations for creating an Arduino 'shield' shield to limit EMI
I am building a shield that contains an AC power supply and relay for an Arduino-like board. The problem I am having is that the relay is quite noisy with respect to EMI, and I can see a few jitters ...
0
votes
2answers
103 views
What power supply should I use?
I am building a robotic arm using 8 servo motors. I am wondering about what voltage my external power will need to be to control all of them at 6v. I am wanting to use a rechargeable battery.
1
vote
1answer
46 views
Turning my GPS logger shield off and on
I have a Sparkfun GPS Logger Shield and I want to save power by shutting it off when I do not need GPS readings. Now reading the hookup guide it says that the "EN" pin can do this: "Active-high chip-...
1
vote
1answer
45 views
Will this SensorHub work?
As a project I have to build a SensorHub with multiple sensors. I am relatively new to the Arduino and circuit world, so I need a little help.
The Goal is to build hub with multiple sensors and to be ...
2
votes
2answers
123 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 ...
1
vote
2answers
178 views
Cannot power up Arduino Uno + Ethernet Shield with other than computer USB
I have successfully wrote a sketch for Ethernet Shield and Arduino. If I plug it into computer's USB, it works.
But if I plug into any other power source, like USB power adapter from iPhone or ...
1
vote
2answers
42 views
How to insert a power button on Arduino Nano
I've an Arduino Nano to which a Micro Servo 9g is connected. The Arduino board and consequently the servo are powered by a USB powerbank connected to the board with a USB mini cable.
My question is: ...
0
votes
1answer
32 views
What if I just connect 5V DC to my UTP?
Here is the image of Ethernet shield near RJ45 socket:
These small boxes are probably SMD capacitors which may mean, that internal board is glavanically disconnected from the UTP line.
Is this true?
...
2
votes
4answers
274 views
Is there any way I can stop the Arduino Mega 2560 from resetting all variables after losing and reconnecting power?
I am using an Arduino Mega 2560 board. I have tried connecting a 115 Ω resistor from 5V to Reset, and 10 µf capacitor form reset to GND (to disable autoreset), and the variables still seem ...
0
votes
4answers
78 views
externally powering the Arduino questions
I have several questions on externally powering the Arduino Uno
I have a 7.2V power source that is 6 rechargeable AA batteries together, 1.2V and 1300mA each. If i use a 4.70 and 1.5 ohm resistors ...
0
votes
2answers
105 views
Wiring LED strips in parallel & ground
Schematic:
I am making some light fixtures controlled by an Arduino UNO. Each fixture will host two approx. 1 meter long analog RGB LED strips with a current draw at full power of ~1.2A per meter. I ...
0
votes
1answer
26 views
SIM900 random shutdowns
I have a SIM900 GPRS/GSM Shield and an Arduino Mega. Now for the past week I have been using USB as power to send and receive GPRS data with no issue. Today the SIM900 module is continually randomly ...
0
votes
0answers
32 views
Arduino restarting after connecting a 12v wall wart
I have an Arduino Uno connected to a few sensors (both on digital and analog input pins) that works perfectly fine when connected to power through the USB plug (via my computer AND a USB wall charger);...
0
votes
1answer
72 views
How to power Arduino and shields with 4 rechargeable AA batteries?
To start, I am a software guy, and I really want to ensure I not going to destroy any components. I previously looked at power through a USB power bank, but the issue with these is that they turn ...
4
votes
2answers
38 views
Arduino Uno VIN 2A
Trying to get started with the Arduino, so I'm trying to do something kinda simple. I'm following this tutorial: Build Your Own Dynamic Ambient Lighting For A Media Center
However, I'm still confused ...
