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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Using L298N with mini n20 dc motor [closed]

I need a motor driver to drive two n20 dc motors at max speed. I was wondering whether the L298N motor driver will supply the correct current and voltage necessary to power the 2 n20 motors at max ...
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64 views

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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1 vote
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67 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 ...
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2 answers
288 views

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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0 votes
1 answer
51 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 ...
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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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1 vote
1 answer
185 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....
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1 vote
1 answer
118 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 ...
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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 ...
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2 answers
207 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 ...
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1 vote
2 answers
65 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 ...
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1 vote
1 answer
162 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) ...
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2 votes
1 answer
103 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 ...
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1 answer
119 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: ...
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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 ...
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2 votes
1 answer
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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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2 answers
113 views

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 ...
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0 votes
1 answer
46 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, ...
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1 answer
26 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?
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3 votes
2 answers
247 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 ...
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1 vote
1 answer
82 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?
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0 votes
1 answer
192 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 ...
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0 votes
1 answer
326 views

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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1 vote
0 answers
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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?
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-1 votes
2 answers
81 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 ...
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0 votes
1 answer
21 views

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 ...
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1 vote
2 answers
43 views

Module that can both detect Voltage (12V) and Control current [closed]

I need a module for ARDUINO that can both detect Voltage (12V) and Control current between 2 pins (12V), like a relay on another device I have found relay modules to control pins and another module ...
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2 votes
1 answer
78 views

Do the I/O pins on Arduino read current or voltage?

So I've recently started Arduino and I just had a question about the digitalRead() function. Does the IO Pins read Voltage or Current? The reason I'm asking is because of the attached circuit. So IO ...
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0 votes
2 answers
332 views

Dimming this ~30V led with PWM, what do I need?

I have a street lamp with a led and simple driver in it, I don't know the exact led voltage but the driver (image attached) says 27-36V DC output, MODEL: 50W. Is there a part I could place between ...
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2 votes
2 answers
142 views

Is it possible to have long wire connections from an NodeMCU to a servo motor or button?

For my proyect, I need to conect my NodeMCU to a servo motor as well as a push button, the thing is, the distance from the NodeMCU and both components has to have a distance of around 6.10 meters (or ...
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1 vote
1 answer
52 views

voltage regulator

This may not be the best pace to ask this but I have to use a 3.3v regulator with this esp12 . For that I have selected this regulator 3,3v regulator and in the discribtion it is saying to use two ...
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-1 votes
2 answers
45 views

Certain componenet does not seen to respond when given voltage

I am using a part off an electronics set I got a long time ago. It is off a electronic set called snap circuits rover deluxe Its a disc launcher and I have wired it to how it seems to want to be ...
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0 votes
1 answer
268 views

9 volt battery not being able to power motor driver [duplicate]

Currently I am using a 9 Volt Duracell A one like this: I am using it to power a motor driver which contains 2 motors within. I can see where the main problem is coming and that is to do with that ...
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0 votes
4 answers
1k views

Why is my transistor switched output so low?

Help needed! I am using an Arduino Nano and a general purpose npn (2n2222a) transistor to provide a 12v signal to a low current 12vdc load in an automobile. The Arudino code is set to pulse D2 at ...
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2 votes
1 answer
588 views

Inaccurate and non-precise voltage reading from Arduino Analog pin

float get_volt() { rawVolt = analogRead(voltageSensor); vOUT = (rawVolt * 4.6) / 1024.0; vIN = vOUT / (R2/(R1+R2)); //if(vIN>12.0){vIN=12;} //if(vIN<11.12){vIN=11.12;} //return (vIN -...
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8 votes
3 answers
334 views

Measuring li-ion that arduino is running from

I am using a 5v Arduino pro mini (with regulator and power led removed). I have been reading how to accurately measure Li-ion batteries when powering from the same battery you are trying to measure ...
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2 votes
1 answer
342 views

Measure Vcc on ATtiny13a?

I am trying to figure out if I can measure the Vcc of attiny13a, but the code I use for arduino's and attiny85 does not work. This is where I got the code from. I know that it works by using the 1.1v ...
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2 votes
0 answers
63 views

Arduino Voltage Reading Problem

I was trying made a gear indicator for my bike, with manually sensing the gear shift. But failed, cause my bike has no separate "neutral" wire, instead there is gear sensor in-built...!! ...
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-2 votes
1 answer
365 views

BJT - BC547 not working with LED strip

I'm connecting an LED strip that takes 12V input to an Arduino Uno R3's 5V VCC using a B547 transistor. Here's my circuit: Base -> 1K ohm resistor -> DO13 Collector -> -ve of LED strip ...
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0 votes
2 answers
257 views

Is it bad to power a arduino mega with 6V via USB?

I'm working on a project where there is no external 5V voltage regulator available but only 6V. I can not power it through the power jack because via this way I do not have enough current and get ...
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1 vote
1 answer
3k views

Power supply for Seeeduino Xiao

The Seeeduino Wiki claims that it can run on 3.3V/5V. It doesn't specify if it can step down higher voltages. I am looking to power the XIAO using a battery. It usually uses a USB-C cable which can ...
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1 vote
3 answers
2k views

Why is my passive buzzer clicking instead of buzzing when set to HIGH?

everyone. I am working on learning Arduino from scratch and I am on the buzzer lesson. The tutorial I am following consists on writing a code to get an input from the user in the form of an integer ...
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0 votes
0 answers
129 views

Convert 1-5V to 4-20mA using Arduino

I am trying to convert 1-5V to 0-20mA which is then used to drive VFD. Actually, I want 1-5V Variable output from Arduino. I am using PWM but its output 0V or 5V depending upon the duty cycle. Is ...
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-1 votes
1 answer
670 views

How to power 6 servo motors using battery to create a robotic arm?

I am trying to create a robotic arm. The problem is that I could not run all 6 servo motors -3 MG966r servo motors and 3 MG90S servo motors - simultaneously, using 12V and 3A AC to DC adaptor. Last ...
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0 votes
1 answer
48 views

Arduino voltage connection pins

On the Arduino power connector jack, which is the positive terminal pin and the negative pin?
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1 vote
1 answer
134 views

how do i know what battery(how much ampere and voltage) my circuit needs to work perfectly?

i really love to make a lot of things but i always have this problem that i don't know how can i determine what battery(with how much voltage and amp)my circuit must have to work perfectly! please ...
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  • 13
0 votes
2 answers
98 views

5V on HIGH Digital Pins, Only While Using USB Power

So I have a small problem with my Arduino Pro Mini here. May be worth noting that it is a clone, but otherwise this is still some weird functionality. I have done some experimenting so I'll just set ...
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-1 votes
1 answer
73 views

Dynamically control the output voltage of a 60V DC input

I am hoping to control a 60V DC input source dynamically using my Arduino so that the output voltage could vary between 0v to 60v. At first i was looking into digital potential meter, however I couldn'...
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0 votes
1 answer
191 views

Does using multiple HX711 amplifiers change the supply voltage of an Arduino?

I’m creating essentially a load cell using an Arduino Nano and an HX711 amplifier. However, I want to have two HX711 amplifiers running off the same Arduino. Will that change the supply voltage since ...
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2 votes
1 answer
66 views

Thermocouple and multimeter

I've put together this script that should allow my Arduino Mega to be show thermocouple readings on the serial monitor, whilst also showing readings of voltage and ohms across a given component. I'd ...
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