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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21 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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0answers
21 views

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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1answer
42 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 ...
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2answers
51 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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1answer
39 views

LED Music Visualiser

I am trying to create my own LED music visualiser for a university project but I can't seem to find anything I am looking for in terms of circuitry that I need for the project. I am using a teensy ...
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1answer
38 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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1answer
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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2answers
145 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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1answer
63 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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1answer
56 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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0answers
39 views

What Kind of relay module to use if i want to turn on or off high voltage appliances like AC? [closed]

What kind of relay module to use if i want to turn on or off my AC (which is a 1.5 ton bluestar) using arduino. Like we use a 5v relay for small appliances like fan and lights, what to use if i want ...
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113 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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44 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?
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2answers
51 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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1answer
20 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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2answers
34 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 ...
2
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1answer
50 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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2answers
83 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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2answers
59 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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1answer
37 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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2answers
43 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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1answer
103 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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5answers
831 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 ...
2
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1answer
299 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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1answer
67 views

I just want to control a 48 volt and 30 amp current with pwm singnal…i don't nkow what components is needed for this [closed]

I just want to adjust voltage of a dc dc converter output with pwm signal...i used MOSFET but i get some heating effect..please tell me what model of MOSFET or ijbt or anything else which components ...
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3answers
241 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 ...
2
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1answer
187 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 ...
2
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0answers
49 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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1answer
156 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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2answers
80 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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1answer
1k 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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3answers
371 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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0answers
85 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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1answer
298 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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1answer
47 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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1answer
69 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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2answers
73 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 ...
-1
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1answer
41 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'...
0
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1answer
153 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 ...
2
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1answer
52 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 ...
2
votes
1answer
740 views

Lolin NodeMCU V3 and 5V sensors

I am new to Arduino and electronics so please correct me if I made a mistake. Many sensors and actuators require 5V. The Lolin NodeMCU V3 has outputs of 3.3V. I want to have them working together. ...
0
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1answer
129 views

How to get the overall average of the data received

I have an arduino uno with two sensors. Voltage and current sensors. I need to get the average value of voltage and current each time the data is received. But i don't know how to add up the current ...
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0answers
125 views

Logging PAR with quantum sensor and Arduino

I want to link a PAR quantum sensor (either Licor or Skye Instruments) to Arduino to log PAR, in order to measure light in a forest. I have an Arduino Uno + data logging shield (with RTC, SD card and ...
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2answers
92 views

need at least 5 volts but 3.7 lithium polymer battery does not supply enough Voltage

I am building a device using an Arduino Nano, an OLED display and infrared thermometer sensor. I want to make it rechargeable so I am using a 1 cell lipo battery and a tp4056 circuit protection board, ...
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1answer
102 views

How to Measure many voltages (Uno) - Analog extenders a good option?

I am trying to make a battery capacity tester (3.7v li-ion 18650 battery) using arduino uno. If possible i'd like to test 20 or more batteries at the same time. I need to measure the voltage of each ...
0
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1answer
46 views

How much current needed to power arduino uno?

I am planning to build an rc car based on arduino uno. I will use 3S 11.1 V Li-po to power whole circuitry. So my question is; First, can arduino be powered directly with 11.1V from its Vin pin? ...
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1answer
54 views

Have I fried my arduino uno?

I made a smart dustbin using arduino, servo motor, & ultrasonic sensor. It worked pretty well for a few number of days. But once I don't know how but the Arduino 'ON' light started to become dim ...
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1answer
138 views

Why Arduino pins don't output 0 volt?

void setup() { pinMode(5, OUTPUT); } void loop() { analogWrite(5, 0); // or //digitalWrite(5, LOW); } Output is 0.003V and the tiny voltage causes the circuit to draw 20uA. Is there anyway ...
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2answers
107 views

Turn on/off low current device (LED) with Arduino

I am just starting with Arduino and my first project consists in switching a LED light with Arduino. I know a relay must be use to control AC high voltage device (i.e. 240V), however, as my LED seems ...
-1
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2answers
176 views

Why voltage drop cause changes in analog reading of hall-effect sensor?

The sensor is a hall-effect UGN3503 sensor and I'm using a TL431 shunt regulator as voltage reference for analog readings. I'm using analogRead() with setting the analog reference to external ...