Voltage level should be used for questions that are referring to using hardware together that operates on different voltages (the "concentration" of electricity).
Questions tagged [voltage-level]
294 questions
62
votes
4 answers
What are the 5V and VIN pins for?
I believe I can supply the Arduino with power in three different ways:
Use USB. The design trusts the 5V to be regulated, and does not regulate it in any way.
Use a regulated power source, trusted to be 5V, and connect it to GND and 5V.
Connect…
Mads Skjern
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27
votes
2 answers
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?
Nyxynyx
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22
votes
4 answers
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 the built in voltage regulator?
This will give…
Nyxynyx
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22
votes
10 answers
How to identify Arduino Mini Pro 5v vs 3.3v
I have many Arduino Mini Pro, every from different seller.
Few are 3.3v and most 5v.
I had to clean table for Xmas and now I do not have any idea how to identify 3.3v Arduinos.
They do not have any marks. I bought them on ebay.
I know 3.3v has 8mhz…
Max
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21
votes
3 answers
Arduino Pro Mini (3.3V version) input voltage range / tolerance
I have a few Arduino Pro Mini clones (cheap Chinese stuff) and would like to power them with 12V power supply (same as fan voltage). According to the Arduino Pro Mini spec the RAW pin can take 3.35-12V (3.3V model). In practice this means a 12V PSU…
DominicM
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21
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4 answers
How can higher current devices (motors, solenoids, lights, etc.) be controlled by an Arduino?
I'm looking for a broadly applicable solution, one that can be adapted to a variety of projects.
I'm currently working on several projects that each require controlling devices ranging from 800mA to 2A from an Arduino Uno. One controls stepper…
jlbnjmn
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13
votes
4 answers
Does ADC conversion to a voltage rely on the actual value of the +5 V pin?
Questions:
Does the conversion of the ADC count to voltage depend on the actual voltage of the +5 V pin?
If yes, what is the accepted method of getting that voltage from the board?
Background/Detail:
I have a circuit in which I have an Arduino…
Caribou
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13
votes
6 answers
How to output a true analog voltage at output pin
Regarding my program, it is a program that does some calculations and then outputs a voltage based on the result using analogWrite function. However my problem is that I had done my programming based on a misconception that analogWrite function via…
bytk
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11
votes
4 answers
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 exactly? Can you state a voltage range and what makes…
jediz
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9
votes
2 answers
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. This output is biased AREF/2 = 2.5 V.
analogRead Values
The…
Nyxynyx
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9
votes
1 answer
How can a 5v Uno talk to a 3.3v Due?
I currently have an Uno (which operates at 5v), and I'm looking at buying a Due (which only operates at 3.3v). I'd like to make them communicate via Serial or SPI or similar, but presumably connecting them directly isn't an option (I guess the Due's…
Peter Bloomfield
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9
votes
2 answers
What maximum length of wire can I use to connect a push button to an Arduino?
I am trying to get 8 stop buttons to cause an Arduino UNO to activate a single relay!
The stop buttons have been placed 30' to 250' away from the Arduino uno board.
Q: How far can you go with 5v and still get signal back?
Q: Is there a way to…
The Earl
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8
votes
1 answer
Two batteries sharing ground?
I need to power my arduino and 2 DC motors requiring 6V each, I want to power the DC motors with a 6V battery through the vM pin on an h-bridge and use a 9V battery to power the Arduino itself.
On my breadboard I have a dedicated power line and…
Kartashuvit
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8
votes
2 answers
Power supply voltage confusion
I just ran into this article: Arduino: What adapter?.
It says that the external power supply should be 9-12V. That really surprises me, since my Arduino Uno can also be powered via USB, which is 5V.
Later he talks about a 9V pin. But I can only see…
Mads Skjern
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7
votes
2 answers
Level detection of 3.3V from 5V arduino
A quick question about microcontroller digital level on I/O pins. I have a photo interrupter which is powered at 3.3V which is interfaced to Arduino UNO running at 5V.
For microcontroller to detect high or low level is determined by signal higher…
David Norman
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