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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LCDs measuring volts arduino
How do we measure 100 Volts Arduino LCD Proje
#include <LiquidCrystal.h>
LiquidCrystal lcd(7, 8, 9, 10, 11, 12);
int analogInput = 0;
float vout = 0.0;
float vin = 0.0;
float R1 = 100000.0; // ...
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2
votes
1
answer
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Generating digital positive (+5 V) and negative (-5 V) signal?
Problem in getting -5 V with Arduino.
void setup() {
pinMode(13, OUTPUT);
}
void loop() {
digitalWrite(13, HIGH);
delay(20);
digitalWrite(13, LOW);
delay(20);
}
Above code is generating ...
- 195
4
votes
1
answer
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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 ...
0
votes
1
answer
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Measuring voltage on an analog pin - What do I need to know about amperage?
I'd like to measure the voltage at a test point on a stepper motor driver chip with an arduino. The voltage at this point controls the amperages to the phase coils and is adjusted to trim the driver.
...
- 259
3
votes
1
answer
1k
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Arduino Nano gives 7V on the 5V PIN!
I have an Arduino Nano which is Powered by an external Power supply. This is connected with VIN and GND. The voltmeter says, there are 12,12 V
I have some components connected on the 5V PIN, which ...
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-2
votes
1
answer
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Reading temp data [duplicate]
I have hacked this kettle so that I can turn it on and off remotely via wifi and that is working perfectly.
Added this to get a better signal.
This is my micro controlling the 5v buttons on the ...
- 425
2
votes
1
answer
592
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Adafruit TLC5947 breakout board is not working with my Arduino Uno
I am trying to use this board (setup tutorial on left hand nav) with my Arduino Uno. I have tried using their example code, as well as my own simplified code, to turn on a single blue LED.
The ...
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1
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Where is the Aref pin for Attitny88
I would like to use the external analog refence voltage in an Attiny88 project I am working on that will be powered with batteries.
However, the datasheet for this processor does not show an Aref ...
- 359
1
vote
1
answer
812
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IR sensor readings at different voltages
I am currently working on a photo-transistor like this:
http://www.ebay.com/itm/10pcs-ITR8307-S18-TR8-Optical-Switches-Reflective-Phototransistor-Output-/381374566327?hash=item58cbb20fb7:g:...
- 359
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1
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546
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How can I power an Arduino in a 3-phase environment?
I am working on a project which uses an Arduino board. Currently I am testing my device using 2-phase power and it works fine. I want to use that device in agriculture fields where 3-phase power is ...
- 131
2
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1
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When it says the Uno has logic level at 5 V is that also true of a bareduino/breadboard Arduino?
I want to hook up ESP8266, which has a 3.3v logic level to my bare-bones Arduino (basically a minimal interface for the ATmega382P IC).
I can power my circuit at 3.3 V without a 5 V regulator so will ...
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2
answers
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5v to 4.3v Regulator - For SIM800 module
I want to build a simple voltage regulator 3.8-4.2V with atleast 2A Peak Current Capability for my GSM Shield (It doesn't have regulated power supply), I don't want variation or it may burn the board....
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How to read a higher voltage digital input?
Lets suppose I have a circuit with a car battery, a switch and a led. The led will turn on when the switch is closed, and turn off if it's not. I want to remove the led from the circuit and put an ...
- 225
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Pro Micro Voltage regulator burned
I'm using Arduino Pro Micro (5v version) in one of my project for my car. The car's 12V +ve connected to RAW input of ProMicro and everything seems to work perfectly until I crank the ignition of my ...
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How much voltage/current do I need for multiple chips?
I have a Huzzah ESP826 Wifi breakout chip which requires 3.3V power voltage and peaks at 500mA of current, and an LED strip which requires 12V and 1A. How can I power both with one dc jack (I have a ...
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2
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Choosing Right Power Supply for Arduino - ESP8266 - HC-SR04
If I make connections like you see in picture below, will it work? Will I damage ESP or HC-SR04?
As I know;
HC-SR04 (VCC) -> 5V
ESP8266 (VCC) -> 3.6V
ESP8266 (RX/TX) -> has 5V tolerance ?
I ...
1
vote
5
answers
7k
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Need to power Arduino Mega 2560 with 3.3V
I found an LCD for my Arduino Mega 2560 that's parallel (I like that, I don't like SPI), but it works at 3.3V and isn't 5V tolerant. That's why I'd need to use level shifters, but that would use too ...
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votes
2
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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 ...
- 1,598
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Wrong analog reading
I am making a simple Li-Ion battery Tester. Basically its two 5R1 resistor in series and a relay (used to cut off the battery when it reaches cutoff voltage). Arduino is connected with ground to the ...
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3
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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 ...
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2
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Measure Vcc using 1.1V bandgap
For an battery driven application I want to measure the Vcc (using an Atmega 32u4). That is my code:
int readBandGap() {
ADMUX = (B01 << REFS0) // VCC
| (0 << ADLAR) // ...
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2
votes
1
answer
422
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Arduino as voltage monitor shorts to ground
I need to monitor voltages of several DC circuits in a generator's contact box. Whenever the generator has an alarm, a LED is lit in the box and voltage on the line drops to zero. I successfully get ...
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1
vote
1
answer
232
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Using Piezzo Electric buzzer 10V with an Arduino Lilypad USB
I bought a 10 V Piezzo electric buzzer and I wonder how to connect it to an Arduino (in my case a Lilypad USB, but the question stands for any Arduino I guess...).
I hadn't realized this was a 10V ...
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2
votes
1
answer
319
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How to calculate voltage?
I want to check each cell voltage using arduino.
and how to calculate dc current using CT Sensor using Arduino?
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Attiny88 problem with LEDs and voltage
I have the following problem and wonder if anyone may have some inside into what may be happening.
I have an array of 20 leds that i manage to multiplex using the attiny88 using only 9 pins (4 ...
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1
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How to measure the state of charge of a battery in arduino
This questions has been formulated several times with not clear answer, and I wonder if there is one.
it is well stablished from several sources that measuring the voltage of a battery alone is not ...
- 359
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3
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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?
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5V+ Voltage to the arduino analog
If I connect a 12V / 12V+ battery to the arduino (uno) analog, will it be damaged ? What if I connect 230-240V to it ? Don't worry I haven't tried it yet. :D
Thanks in advance.
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Reading a photoresistor
I have a wire with a 0-5v current. I want to detect if the current is there or not (HIGH/LOW.)
I'm using an optocoupler to avoid putting too much current into my micro, as it is only a 3.3V micro. I'...
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votes
3
answers
11k
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Use Arduino to detect low battery state and shut it down
I wanted to know if it is possible to monitor a battery that is driving the Arduino and check its voltage. When the voltage drops below a certain level (i.E below 3.0V) it should shutdown and ...
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3
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1
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15k
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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 ...
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226
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DIY Watering - Required components
I am looking as a first project after some simple project kits, to make a watering system for my indoor plants. I have seen a few projects on instructables, so I went to look for components. I am not ...
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2
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14k
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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 ...
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66
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Programmed 5 Volt output to power a relay
I need to put out 5 volts from an Arduino UNO digital pin. I've read that the pins can do approx. 5 volts, but I need to know if it will actually reach 5. I'm also powering a few other devices from ...
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2
votes
0
answers
85
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How to splice into existing buttons?
I want to control a kettle. It has 4 buttons and a digital disply of the temp. I would like the buttons and disply to remain functional. I just want to make the buttons remoteky pressabke. The buttons ...
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vote
2
answers
8k
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Arduino Due and Vin, 3.3V and 5V power inputs
I just want to confirm something before I wire up my first ever Arduino project and fry all the stuff I just spent money on.
It is my understanding that the Vin power input will tolerate a 9V battery ...
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1
vote
1
answer
549
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FTDI Adjustable 3v3/5v only outputs 5v
I bought the below FTDI programmer for use with my 3v3 arduino pro mini. But even when the switch is set to 3v3 it is powering the board with 5v, (hence the IO voltage is also 5v). Note that when the ...
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1
answer
2k
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Create a Li-Polymer Battery Charger
I want to Create a battery Charger with the Arduino with real time battery status. I don't have any idea how to do that same time as the charging.
I know to use a serial monitor to get battery ...
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1
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634
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Could an `analogWrite` command and its variable output values be used to power multiple leds with same intensity? [duplicate]
I seem to be getting the right response on single LED but with multiple LEDS or a relay connected LED strip the voltage outputs seem to be insuffiecient.
What kind of analogWrite values does an LED ...
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2
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796
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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, ...
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1
vote
1
answer
675
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Calculate how much battery power left
I run my 12V car battery trough a trimpot into my pro micro, micro controller.
I am using (voltPinValue1 * 0.01465) to get the Volt out of analog in. I have trimmed the pots and getting the right V.
...
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2
votes
2
answers
13k
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HC-06 Bluetooth RX & TX voltage (3v3 || 5v)
I acquired a HC-06 Bluetooth module, and understand that the voltage on the pins must be 3v3 and therefore requires the use of a voltage divider to lower the Arduino's 5v to 3v3 like this.
But the ...
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votes
1
answer
6k
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SMD Voltage Regulator 662k very hot, how to repair it?
I think I made a mistake. Now, the 662k on my Arduino Uno very hot about 90°C.
I test it, it can be programmed and can run blink program normally.
There is a switch for voltage choose. Now, run in 3....
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votes
1
answer
232
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output of yun is not 3.3
After execute the program of below, the 13 pin output is 4.8v. Why it's not 3.3v?
void setup() {
// put your setup code here, to run once:
pinMode(13, OUTPUT);
}
void loop() {
// put your main ...
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votes
2
answers
227
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Arduino voltage drop while communicating with another Arduino
I have an Arduino Uno rev 3 and an Arduino Nano in my Setup. I want to create a proof of concept, where one Arduino triggers the other via the Digital IOs.
Arduino 1 sets a blinking signal on a ...
Matze
1
vote
1
answer
316
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difference between output pin high and 5v pin
So this might be a total noob question (which admittedly I am) I have a Motor, if I connect it to GND and the 5V output it runs. Ok so far. But if I connect it to GND and a pin set to OUTPUT and HIGH ...
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2
votes
0
answers
226
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Arduino based temperature sensing circuit
I've currently got a setup where I am using a 2 thermocouple setup using MAX31850 and the circuit looks exactly as mentioned here using the external power option. (https://learn.adafruit.com/adafruit-...
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3
answers
444
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Run Arduino on USB and at the same time BreadBoard on higher voltage?
I am trying to design a bicycle LED lighting system, and for that I bought an Arduino yesterday (so very beginner with Arduino).
My final system will operate at 6V, so I plan to put everything on a ...
- 503
0
votes
2
answers
20k
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How to convert the 0-5V to a 4-20mA current loop?
I'm pretty clueless about electronics so everything has to be explained in simple terms to me.
I have an Arduino with a program which provides a value via the Analog output, so that is anything from ...
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1
vote
2
answers
925
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Why are MOSFETs only giving 8.1V for LEDs, not 12V?
I'm using three PWM outputs from an Arduino Mini Pro to drive the R/G/B parts of some strips of LEDs. The circuit is basically this:
I've got a single 12V power supply, rated at 200W, to light the ...
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