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).

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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 ...
Aditya Jain's user avatar
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6v High Torque Servo Won't Function On Motor Shield?

I have only ever been able to get this servo to “somewhat” work when connected to 5v pin on the shield, the ground on the shield, and the signal line attached to whatever pin. But 5v is not enough and ...
ConnorC's user avatar
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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 ...
Bart's user avatar
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When I use AnalogueWrite the voltage doesn't vary properly

I have a project where I want to control a pump, I use an Arduino, connected to a driver L298N and I will connect the pin 5, 6, 7 of the arduino to the pin IN2, IN1, ENA of the driver respectively and ...
Nept0's user avatar
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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 ...
warherolion's user avatar
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I'm planning on using 2 arduino boards for my project. Should I use 2 voltage regulators for project or use 1 for both?

For context, my first board would contain a motor circuit with an L298N motor driver while my second contains a controlled heating system that uses 2 relays with PTC heating elements, DHT11 sensor, ...
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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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channels on logic level shifter outputs high

so I have a logic level shifter which is TXS0108E ,I use it to shift the eps32 ouput volatge to 5v to be used with motor driver ,when I test it with multimeter , all the channels on the B side outputs ...
kamal MKA's user avatar
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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 ...
IM OG's user avatar
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MKR 1010 voltage confusion

I'm very confused about powering my MKR 1010 on a breadboard. It says use USB, but that is 5.5 V and it specifically says never go above 3.3 V, yet there is a 5 V pin. So what size external power ...
greg's user avatar
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How to produce multiple DC voltages for a single project with different dc requirements

I have a project that has 2 12V .2 amp fans, and 1 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 of ...
NoobEngineer123's user avatar
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918 views

Powering up a 16x2 LCD display with only a 9V battery

I'm using an Arduino (Nano 33 IoT) board for a project and apparently this board can only supply with 3.3 volts when a 9V battery is connected to it through Vin and GND pins. In other words, I'm ...
Yosor Shishakli's user avatar
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1 answer
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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 ...
BruceWawe's user avatar
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Controll the dc motor that works with 2xAA bateries using 5v

I have a toy that has a dc motor and is runing with 2xAA bateries ( i think it is 3v motor) So i want to run it with 5v power supply. First question: Can 5v damage the motor Second question: i think i ...
wuqn yqow's user avatar
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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 ...
Jess's user avatar
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Why 5V instead of 3V3?

I'm still quite new to electronics, so please forgive me if the answer is obvious. I was wondering why virtually all the example circuits I find use the 5V power supply with resistors for all the ...
user2206916's user avatar
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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:
Fabio Magarelli's user avatar
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1 answer
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Generate a sine wave with a predefined frequency and amplitude via DAC0 or DAC1 with Arduino Due

Good Morning to everyone, I am a PhD Student in experimental fluid mechanics at the University of Naples "Federico II", Italy. I am working on Arduino Due card and i am novel in applications ...
AlessandroScala's user avatar
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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 ...
Adrian's user avatar
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Arduino outputting 4.7V instead of 3.3V when using I2C communication/sensor?

TOF050C-VL6180X Sensor was not responding, so I checked it with a multi-meter, and the VIN, GND solder pins on it read 4.7V. Double-checked Mega voltage, without anything connected, and it shows ...
Maksiss's user avatar
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2 votes
1 answer
465 views

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 ...
soheil's user avatar
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1 answer
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One LED in 4x4 matrix does not turn on [closed]

I'm an art student and absolute beginner to electronics/code - my broader goal is to learn how to control individual LEDs when there are many of them (like 64 or more even, so am learning about ...
Miso's user avatar
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2 answers
236 views

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, ...
meyer_mit_ai's user avatar
2 votes
1 answer
142 views

Measured voltage higher than AREF

What happen when a voltage measured by analogRead() is higher than AREF voltage? Example: AREF = 2.5V AO = 3.2V What is the maximum voltage ?
Jacques's user avatar
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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 ...
alexlikesallthegamez's user avatar
1 vote
0 answers
289 views

Arduino and PCA9685 - Suddenly stopped working

I'm using an Arduino Uno and a PCA9685 board to run 4 servos (of type MG996R). For that, I set up the following connections: SCL -> SCL SDA -> SDA Ground -> GT VCC -> 3.3V As the servos ...
pte's user avatar
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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 ...
rattlesnake's user avatar
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121 views

Measure voltage in 14 points 0 - 60 volts (14s LiPo battery) with single ADC

I wish to measure 14S battery voltage on each cell with single ADC. I guess I need some ADC built-in or external (I2C), voltage divider and switch chip that will allow me to select one of 14 pins to ...
Max Fry's user avatar
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0 answers
558 views

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....
Proxima Centauri's user avatar
1 vote
1 answer
643 views

How does the FireBeetle ESP32 regulate to 3.3v? (schematic provided) [closed]

The FireBeetle ESP32 advertises an input voltage of 3.3v-5v, with an operating voltage of 3.3v. I tested this with an 18650 lithium-ion battery and can confirm this is true. For 3.3V < Vbat < 4....
kirtan-shah's user avatar
1 vote
1 answer
334 views

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 ...
NOMAD's user avatar
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1 vote
0 answers
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How to use 5v and 12v addressable led strip together

Hi guys I’m new to this forum and also not much experience about led lights question already asked but didn’t get any detailed answer I want to know can I provide working data signal to 2 different 5v ...
J Dis's user avatar
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1 vote
2 answers
668 views

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 ...
surendra choudhary's user avatar
1 vote
2 answers
97 views

Where can I know voltage between GND(ground) and each port of UNO R3?

Currently I'm new to arduino uno r3. Where can I find each voltage between each port and GND(ground)? Or can the voltage be changed? I don't want to break my led bulbs since large difference of 2 ...
electrical apprentice's user avatar
2 votes
1 answer
594 views

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) ...
KidWithComputer's user avatar
3 votes
1 answer
451 views

Programmatically-adjustable buck converter module?

LM2596 is easy to use and cheap, but I have to adjust the output voltage using a screw driver. On the web, there was a "hack" that someone posted, but that hack does not seem as clean or ...
Damn Vegetables's user avatar
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1 answer
378 views

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: ...
rfii's user avatar
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0 answers
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Servo make partial rotation and stop working automatically

I'm using this board in my robotic arm project: Adafruit PCA9685 16-Channel Servo Driver ( https://learn.adafruit.com/16-channel-pwm-servo-driver/using-the-adafruit-library) I've connected all of my ...
elp's user avatar
  • 111
2 votes
1 answer
74 views

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 ...
krystof18's user avatar
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2 answers
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LEDs always dim with arduino nano

so I'm making an animated LED brake light using arduino nano, similar to this: https://www.youtube.com/watch?v=d5Ohzg3JKq0&ab_channel=IMEEMADE I have 18 channels, with differet amount of series ...
user72995's user avatar
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1 answer
48 views

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, ...
B7th's user avatar
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0 votes
1 answer
29 views

Can I run 3 motion sensors with a voltage regulator?

I want to power 3 hc-sr501 PIR motion sensors with a voltage regulator that can output 5v-1A. If I make such a system, will there be a noise?
Sabri73's user avatar
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3 votes
2 answers
629 views

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 ...
TeD van Loon's user avatar
1 vote
1 answer
126 views

Is there a 3.3V and 12V 18650 circuit?

Is there an all in one circuit which regulates charging, protects and steps up/down an 18650 battery to 12V and 3.3V at the same time, so I can power a sensor and my ESP32?
Dimitrije Vasiljevic's user avatar
0 votes
1 answer
372 views

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 ...
Rhu Pagal's user avatar
1 vote
2 answers
83 views

Will the L9823 work at 3.3 V with Wemos boards?

Or is it 5 V only? https://www.st.com/en/automotive-analog-and-power/l9823.html I see in the data sheet it says under Absolute Maximum: Supply Voltage: VDD -0.3 V to 7 V Then, under Electrical ...
Scott's user avatar
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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 ...
Roel's user avatar
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0 answers
190 views

using a digital pin on node mcu as an analog

i want to use volte and current sensors (ZMPT101B and ACS712) on node MCU these sensors are analog but node mcu has on analog pin can i use digital D0 pin for voltage sensor?
mohamed mansour's user avatar
-1 votes
2 answers
159 views

Connect 12V 38A battery to SIM800C GSM Module

I have a gsm module that is rated for 12V and 1A. And I also have a drone Battery that is 12V and 38A. Would it hurt the gsm module If I connect it to this high power Battery? I heard It's voltage ...
Abraham's user avatar
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1 answer
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Different Output Voltages from Same Source?

I'm wondering whether it is possible to wire multiple buck converters with different voltage requirements and amperage draws to the same power source (this idea is for controlling a radio-controlled ...
Denis G. Labrecque's user avatar