Questions tagged [voltage]
Voltage is the difference in electric potential between two points of an electric circuit, measured in Volts (V). Voltage can be constant (DC) or varying (AC).
157 questions
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What does VRx stand for in the KY-023? [closed]
The x and y axis pins on the KY-023 are labeled VRx and VRy, but I'm curious as to what they stand for, as I couldn't find any official statements about it. I assumed it was "Variable Resistor X/...
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How to power 2 MG996R towerpro servo
I am a beginner and tried powering MG996R Tower Pro (180 deg Metal Gear) Servo from Arduino UNO and ended up hibernating the host PC.
I want to power 2 such motors (in parallel configuration) for lets ...
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Arduino read thermocouple Type K with ADS1115
I ordered a ADS1115 so I could measure temperature of a type K thermocouple, but I am not managing to get accurate readings. I had it working while having a normal A0 pin, but since the type K table ...
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Unable to control motor with ESP32 using logic level shifter
I am using an ESP32 a TB6600 micro stepper, and a Nema 23 stepper motor, I am trying to control the motor with the esp32 but the TB6600 requires a 5v signal, I tried to fix this by using a logic level ...
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how to change output PWM based on analog input
I want to give different PWM (D11) signals based on how much voltage is input (A7). How can I change PWM for different analog values?
#include <LiquidCrystal.h>
#include <ezButton.h&...
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This DC Motor shouldn't have any current while I'm not pressing the button (pin 7 is LOW) but it has. (When I'm pressing the button its as intended)
I can't seem to find the problem, and I believe its not about the code but I will give you the code nevertheless.
const int pinOFswitch = 4;
const int motor_3 = 7;
const int pushbtn = 5;
void ...
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How to produce multiple DC voltages for a single project with different DC requirements?
I have a project that has two 12-V .2 amp fans, one 30 3 amp LED COB panel, and a 5-V Arduino. I was wondering if there was a simple method to power all of these devices from a 120 V wall outlet.
As ...
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Potential difference across the same wire [closed]
This issue may be weird, and I'm not sure if this is because of my wiring, but it would seem that I do not have the same voltage (or approximately the same voltage) between the VCC(3.3V) and the VCC ...
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How to trigger a function by detecting voltage change?
#define monitor_pin 14
void setup()
{
pinMode(monitor_pin , INPUT);
}
void loop()
{
unsigned long d1 = pulseIn(14, HIGH);
if (d1>0){//trigger function}
}
I know there is a function ...
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power 12v solenoid from DC jack of Arduino Uno
I was wondering if it is possible to power up a 12V solenoid valve from the DC jack of the Arduino Uno, provided that I'm powering the Arduino from the same jack:
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Voltage drop when power from AA batteries
I am using a Arduino MKR 1010 Wifi board to control 4 servo (PS-1109MG). All the circuit is powered by 4 AA rechargeable batteries (1.2V * 4). Arduino is powered through the Vin port.
Below is a ...
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Problem with displaying true RMS of the main voltage using Arduino Uno and MAX7219
I want to display the true RMS of the main voltage using an Arduino and a MAX7219. At first, I used of circuit #1 (the following circuit) and the True RMS library. The circuit could successfully ...
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Arduino Nano: HUGE voltage drop on VIN
I am building a small automated indoor greenhouse. I want to use an Arduino Nano to control some LEDs und a fan (both through relays) and a water Grove Water Atomization module. Everything works fine, ...
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Could I put an arduino in series with a battery charger?
recently in one of my projects I have wanted to make battery powered. I was wondering if I could connect the charger to the battery and the battery to the Arduino without blowing it. The battery is ...
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How do I find out the maximum current through VIN on a NodeMCU board?
I read this answer https://arduino.stackexchange.com/a/51878 to a different, but related question. It seems like VIN on the NodeMCU is directly or via diode connected to the USB connector.
Image ...
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PZEM-004T can't read current
I'm trying to measure the current, voltage, and power of AC load using Peacefair PZEM-004Tv3.0 module. For the serial communication of this module, I'm using SoftwareSerial Pins 2 and 3 on Arduino Uno....
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Measuring the battery level powering the arduino
I would like to power my arduino nano with a 9V battery, but I would also like to measure the voltage of the battery to know its charge level.
Can I use the MAX471 Voltage Current Sensor module by ...
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Differential voltage measurement using Arduino
I have a electrolysis cell in which the anode is hanging using a Structure in a electrolyte. The cathode is at the bottom of the cell with electrolyte above it and anode being dipped into this ...
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How to calculate required amperage of multiple motors?
I a very simple question about calculating the amperage I need to run 5 stepper motors from my Arduino Uno.
If I have 5 28BYJ-48 stepper motors(which are 5V and are said to require about 240mA each) ...
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What is happening when digitalWrite(pinname, LOW) is invoked after pinMode(pinname, INPUT_PULLUP)?
I read the Arduino official docs on digitalWrite and am confused about what is happening from an electrical perspective when digitalWrite is invoked on INPUT_PULLUP pins.
Say my code says this:
...
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Arduino changing output based on wire voltage
I’m new to arduino and I want to build myself smart switch that can be turned of both manualy and via wifi, is there any way to change position of relay based on if another wire is live or not? Im ...
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Chips & High voltage: Connected in Series?
I have 3 micro-controllers that will be connected to a battery, and I need to provide each of them between 3 and 5 volts maximum.
I have 3V batteries but they do not seem to provide enough power, ...
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Arduino measuring high-voltage electric fence
I would like to know if someone has experience with measuring high voltages using an Arduino.
I know you can use resistors to lower the voltage, however.
I want to be able to measure the pulses of an ...
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INA219 with L298N POWER LOGGER
I Have been working on a power logger with INA219 and L298N
the thing is, the voltage and current displayed on Serial Monitor is not the same on my multimeter.
the Arduino is connected to the pc to ...
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Arduino Nano Every Vin 5V fixes I2c problems
I had problems with connecting my devices via I2C. The "requestfrom" constantly hanged and the endtransmission sometimes gave NACK responses.
After disconnecting the devices from 12V and ...
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