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Questions tagged [voltage-level]

Voltage level should be used for questions that are referring to using hardware together that operates on different voltages (the "concentration" of electricity).

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61 votes
4 answers
269k views

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 ...
Mads Skjern's user avatar
  • 1,125
27 votes
2 answers
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?
Nyxynyx's user avatar
  • 1,409
22 votes
10 answers
106k views

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 ...
Max's user avatar
  • 323
22 votes
4 answers
108k 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 ...
Nyxynyx's user avatar
  • 1,409
21 votes
3 answers
16k views

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-...
DominicM's user avatar
  • 597
21 votes
4 answers
8k views

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 ...
jlbnjmn's user avatar
  • 978
13 votes
4 answers
8k views

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/...
Caribou's user avatar
  • 233
13 votes
6 answers
33k views

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 ...
bytk's user avatar
  • 133
11 votes
4 answers
9k 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 ...
jediz's user avatar
  • 217
9 votes
2 answers
14k views

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 ...
The Earl's user avatar
  • 111
9 votes
1 answer
3k views

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 ...
Peter Bloomfield's user avatar
9 votes
2 answers
8k 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....
Nyxynyx's user avatar
  • 1,409
8 votes
2 answers
3k views

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. ...
Mads Skjern's user avatar
  • 1,125
8 votes
1 answer
5k views

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 ...
Kartashuvit's user avatar
7 votes
2 answers
4k views

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 ...
David Norman's user avatar
6 votes
4 answers
7k views

Confusion with ATmega328P and 3.3V/8MHz

Firstly, I have tried to set the bootloader to be 8MHz internal oscillator. I have tried the board setup from here - https://github.com/oshlab/Breadboard-Arduino. And also the breadboard-1-6-x.zip ...
Paul Grime's user avatar
5 votes
3 answers
2k 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 ...
karx's user avatar
  • 235
5 votes
2 answers
5k views

Set Arduino digitalRead reference voltage

I wanted to know if the reference voltage for the digitalRead() function could be set to a particular voltage, either with an external reference or internally. In the Arduino reference under the ...
Suman Roy's user avatar
  • 153
5 votes
2 answers
10k views

How to measure the supply voltage of Arduino without using an analog pin

I'm using Arduino Nano to measure temperature with a 10 kohm thermistor and a voltage divider. My problem is I'm getting only 4.2V on the 5V pin. The power is supplied via a USB cable from a desktop ...
dixhom's user avatar
  • 151
5 votes
1 answer
679 views

Operating / pin voltages ATTiny chips

I would like to set up a project with an ATtiny chip, such as the ATtiny84 or ATtiny85, in which I interface the microcontroller directly with an XBee for both wireless serial communication, as well ...
hobie's user avatar
  • 487
5 votes
2 answers
1k views

Analog read negative voltage inbuilt protection

I'm trying to read a -10 to +10V analog signal on my Arduino Mega (2560). I've been using a voltage divider to obtain a -5V to +5V signal (with two 10kOhm resistors), which used to work just fine. I'...
Etienne P.'s user avatar
5 votes
2 answers
9k views

Do I need 3 voltage dividers to control ESP8266

I am buying an ESP8266 and the plan is to control it serially from an Arduino. I am going to use a voltage divider(Using a voltage divider is temporary and I know the cons of using voltage dividers). ...
Clayton's user avatar
  • 83
4 votes
2 answers
16k views

Convert Arduino Pro Mini 5v to use 3.3v

Id like to make my 5v pro mini use 3.3 v instead of 5 because i want to use it in an existing piece of electronics that uses 3v throughout. Looking at the specs for the pro mini it says the 3.3v ...
S Rosam's user avatar
  • 141
4 votes
4 answers
14k views

Can I change VCC pin to 3.3V on a 5V Arduino Pro Micro?

I'm using a 5V Arduino Pro Micro (schematic). For my project, I'm using the VCC pin to output power to an external device. I need VCC to output 3.3V to the external device. Can I open jumper SJ1 to ...
Mark Harrison's user avatar
4 votes
2 answers
406 views

Does the square-wave nature of PWM dictate how much resistance you need?

I think the answer is yes, but I wanted to ask the question anyway for future common reference. And to check my understanding. Say I want to power 10 LEDs with PWM with my Mega 2560. I have a bunch ...
Aurast's user avatar
  • 295
4 votes
2 answers
14k views

How to program ATTiny85 running 3.3V

I have a working project built around ATTiny85 on a breadboard running at 5V. Now I want to move this prototype on a PCB where it will be powered from batteries. All components used are capable of ...
jnovacho's user avatar
  • 235
4 votes
3 answers
4k views

Multiple Buttons on Single Analog Pin and Trigger Pin Arduino Uno

I've researched how to attach multiple buttons to a single analog input using a resistor network. Instructables has a good lesson on this: http://www.instructables.com/id/How-to-access-5-buttons-...
hagope's user avatar
  • 161
4 votes
1 answer
1k views

Do I use 3,3V or 5V, when device supports both?

I have a general question regarding the power-supply of the electronic components, that are attached to an Arduino. If I have a device that operates at voltages between 3,3V and 5V (e.g. this RS232 ...
Michael B's user avatar
  • 370
4 votes
1 answer
5k views

Precision voltmeter using Arduino

I am newbie, I need to measure precise voltage in range 0.00-0.80V, two digits precision. The voltage will not be greater than 1V-1.2V. I wonder if I need divider or not, I am sure that voltage ...
solderingiron's user avatar
4 votes
5 answers
8k views

Powering a 5V Arduino Pro Mini with 3.3V

I want to run the 5V board at 3.3V because I can get the 5V version cheaper than the 3.3V version. I read that you can power the Arduino Pro Mini with a battery by connecting the battery to the 5V ...
laktak's user avatar
  • 143
4 votes
1 answer
6k 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 ...
Alessandro's user avatar
4 votes
2 answers
4k 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 "...
Shpigford's user avatar
  • 484
4 votes
2 answers
2k views

Is my Arduino possibly broken?

We work in groups on a project at school. We had to build an electric scheme with an Arduino to make a small car moving. We got the parts from our school, except the Arduino (we had to buy it ...
user28055's user avatar
4 votes
1 answer
1k views

Measure lipo voltage while powering arduino

I have a arduino pro micro 5V that I want to power with a 3.7V lipo. I also have a charging module to charge the lipo. (https://www.banggood.com/nl/TP4056-1A-Lipo-Battery-Charging-Board-Charger-...
Robbe's user avatar
  • 109
4 votes
2 answers
812 views

How to protect my arduino, while hotplugging its power supply and other related electronics

The unsolved: when I connect power and signal lines to my Arduino - while power is on - I potentially kill it. I have fried 2 so far. Situation: I have build an DMX-controlled lighting fixture, ...
captainSpark's user avatar
3 votes
3 answers
22k views

What is the Vin Pin for?

I always asumed it was a different option to power the board, but it seems to act more like a 5V supply. What then is the difference between this pin and the 5V pin?
Blue7's user avatar
  • 245
3 votes
2 answers
4k views

Safely enabling voltage divider on a 12V battery

I'm planning to monitor voltage of a 12V battery with an Arduino's ADC pin connected via a voltage divider. Since I don't want the circuit itself to drain the battery when not in use, I want to use a ...
Cerin's user avatar
  • 1,658
3 votes
2 answers
6k views

Getting 3.3v on 5v pin in Arduino Uno

When interfacing my Arduino Uno with a relay I was facing reliability issues, and while investigating it with a multimeter, I found something strange. I noticed that in the 5V power pin (with which I ...
jrharshath's user avatar
3 votes
1 answer
1k views

How can I create a battery level circuit

Im trying to create a circuit so that I can monitor the voltage drop on my battery and send an message when the voltage drop reaches the drop out. But I'm having some problems with my voltage ...
fUrious's user avatar
  • 55
3 votes
3 answers
2k views

WiFi module ESP8266 + Arduino Uno

I'm trying to connect a WiFi module, ESP8266-01 to an Arduino Uno. But, as I've understood, this module will only work with 3.3 V. Since all of the data pins use 5 V, one of the solutions is to use a ...
Artem's user avatar
  • 131
3 votes
3 answers
7k views

Using 3.3V XBee with Arduino Pro Mini 5V Version

The Xbee requires a 3.3V power input and the Arduino Pro Mini (5V version) only provides a regulated 5V. Question: What will be the simplest way to provide a 3.3V rail to the XBee from the Arduino ...
Nyxynyx's user avatar
  • 1,409
3 votes
2 answers
249 views

How to turn LEDs based on voltage readings?

I am trying to turn LEDs in an LED bridge based on the voltage reading from a power source. when the Voltage is zero nothing is ON and then the LEDs gradually turn ON as increase the voltage connected ...
Anwar Elhadad's user avatar
3 votes
1 answer
2k views

Digital I/O threshold voltages for ATmega32u4

What are the voltages on a ATmega32u4 (eg Arduino Leonardo) such that a HIGH or LOW is read? I want to ensure that I'm reading the chip reference manual correctly, where Table 29-1 says: VIL: Input ...
Tom Hale's user avatar
  • 431
3 votes
1 answer
2k views

This logic level converter does not want to work

I got this logic level converter to be able to use my lcd but I can't figure out how to get it to work, the problem is that the current is not passing through. This is the model: TXS0108E Any help is ...
xM0nSt3r's user avatar
3 votes
2 answers
814 views

ADC with better performance

I need to sample voltage at a very high rate (say for like 10000 Hz) and with a very good precision(at least 10-12 bit ADC will do). So I am in need of an Analog-to-Digital Converter(ADC) which has a ...
tahsin314's user avatar
  • 131
3 votes
1 answer
15k views

best way to protect a digital or analog input from 12volts

At work, I have connected an Arduino to a security key (which has a 12v power supply) in order to give us a more versatile door lock. Unfortunately, people keep removing the key pad, disconnecting ...
Hoytman's user avatar
  • 747
3 votes
3 answers
6k views

Arduino Pro Mini maximal and recommended current per pin

In Arduino Pro Mini (3.3V) specs indicated the maximal and recommended current per pin, 40mA and 20mA respectively. Does these values means input current (i.e. safe input current Arduino can handle) ...
minto's user avatar
  • 221
3 votes
1 answer
65 views

Arduino ESP8266 communication

I saw two peculiar things while googling this subjects. Sometimes Tx and Rx are connected directly despite the fact, that it works on different voltages, sometimes resistor dividor is used, sometimes ...
Karol's user avatar
  • 31
3 votes
3 answers
4k views

Trying to flash ESP8266 with Arduino UNO

This is my first project other than some of the starter projects. I am trying to flash the firmware onto an ESP8266 wifi module using and arduino uno. It would be nice to know if anything is wrong/...
ewizard's user avatar
  • 173
3 votes
1 answer
779 views

Power arduino from 5v rail of pc molex

I'm building a small device using arduino that should be connected to my pc via a usb header to exchange data with the PC. What I'd like to achieve is that arduino turns on when the pc is on, whereas ...
xanz's user avatar
  • 133

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