Questions tagged [electricity]

Use this tag to indicate the flow of electricity at higher voltage than that used in Arduinos themselves. Examples can include having an Arduino use a relay to switch the electricity for a 120 Volt device like a fan or a light.

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18 views

Touching a capacitive button, non-mechanically

This is not about using a capacitive button to control an Arduino; it is the opposite. I would like to "touch" a capacitive button on another conventional device. There could be a way like ...
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1answer
65 views

Is this circuit risky for an Arduino Uno?

I will show a connection diagram between my Arduino Uno and a DSC HS2032 panel (alarm system). The DSC panel uses 12V and I don't know the voltage fluctuation. The yellow and green are RX/TX ports. ...
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1answer
55 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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1answer
63 views

CH340 chip getting fried after connecting Arduino to a powerful 12V souce

I'm using a 120 W DC power supply connected in parallel with ESC and Arduino nano through Vin. However, somehow the Arduino get fried near the CH340 chip, i.e. around the big black square chip near ...
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0answers
32 views

line following IR sensor not giving readings at 3m wire length?

I am using line following IR sensor with arduino mega. I need the sensor 2-3m away from arduino since the length of rover is 2m (sensor front & motor back). However, I cannot get accurate analog ...
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3answers
105 views

arduino circuit review/ safety review

I have the following circuit It has a simple dc motor that is OFF, and switches ON once a day for 2 seconds. I use MOSFET IRF540N as a switch I use L7805CV as a voltage regulator I would like to ...
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2answers
228 views

12V but what Ampere?

So if my arduino will draw around 800mA @5V and the dc-dc buck converter around 266mA @5V plus solenoid 1.2A @12V, is it a good idea to get 12V 4A (48W) power supply? Since Filip Franik told me that ...
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2answers
410 views

Nodemcu is connected to 5v relay with logic converter but still not working

I am using a bi-directional 3.3-5V logic converter to control 5V relay with 3.3V D5 pin of nodemcu. link of logic converter is here However, I expected to control the relay but it didn't work. I don'...
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2answers
82 views

Arduino Micro & Thin polymer lithium batteries [closed]

Is this battery: Polymer Lithium-ion Battery Model Number: PGEB014461 https://www.powerstream.com/p/PGEB014461.pdf Producing enough energy to power the following Arduino-micro project: ...
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2answers
57 views

Whats the maximum external voltage/current i can apply through an Arduino Uno ? + a couple mini questions

i'm just starting out with electronics and Arduino's and was wondering about the extent of an Arduino's ability. Will i eventually be able to program and power very high voltage/current requiring ...
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1answer
61 views

Help with coding Arduino Nano to run fan through slide switch at specific intervals

I’m trying to use Arduino Nano to run my 5 V PC fan, which, I know it sounds crazy, it’ll be mounted on a piece of Tupperware that’ll control the airflow through it via the fan. However I have no ...
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1answer
66 views

Calculate burden resistor value of current transformer and measure ac current with arduino

I Want to measure AC current with current transformer but i dont know exact value of burden resistor or calculation formula...i want to measure current of borewell pump. company specified pump as 1....
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4answers
105 views

Weight Measurement System using arduino and load cell

I want to use a load cell (Capable of measuring up to 1 ton) connected to a arduino board. I am a beginner, my questions are as follows : 1. How to calculate the current generated by the load cell ? 2....
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1answer
153 views

Attiny85 route vcc though output pin

I'm still learning the basics so please bare with me if something seems unclear ;-) I want to hook up an Attiny85 to a WiFi module (esp8266) and 2 sensors. The VCC will be provided by a battery pack ...
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1answer
1k views

Electric meter pulse counting using LLC

I am trying to create an electric meter reading setup for Arduino, and I have been searching for it and almost every posts available is using LDR sensor. http://www.reuk.co.uk/wordpress/solar/...
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2answers
9k views

How to measure electrical conductivity using Arduino?

I want to measure TSS(Total soluble salt) in soil. I have found in some literature that, through measuring of electrical conductivity, it is much easier to measure TSS. So, I thought, If I can measure ...
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3answers
70 views

How to embed a 5V-range Arduino-based controller in a 12V-range DC circuit?

We have an installation that provides: a common line (C), which divides into two wires; an input line (I), which carries the signal from a button (between I and C there's normally 0V, and 12V when ...
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0answers
60 views

check if a fuse is good or bad in an ac circuit using arduino [closed]

I have a fuse in a ac circuit of which i want to check if the fuse is ok or not. I'm wishing to wire up two nodes of the fuse holder and determine the fuse status. I have a plan of notify user if the ...
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2answers
2k views

Can you use an input pin instead of ground in Arduino circuitry?

Beginner here: Would the circuit in the picture work or do input pins not absorb the energy as ground does? I know setting the pin as an input makes the direct 5V connection safe but maybe I'm ...
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2answers
97 views

Grounding for arduino, measuring phase controllled 240V

I would like to measure a phase controlled 240Vac waveform as a digital PWM input for an arduino. The signal would look something like this: My intent was to use a zener clipping circuit to limit the ...
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3answers
136 views

Powering on the PC

I located the two pins that are responsible for powering up the PC. They are connected to the Power On button and one pin has an output of 5 V while the other is the ground. So far so good, the ...
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1answer
64 views

Simple Ground circuit layout

I am making a circuit without using a PCB or perfboard and i am unsure if i am running the ground wire correctly. I usually prototype on a breadboard with the ground all joining on the far right, is ...
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2answers
272 views

Arduino Nano Circuit grounding

I am making an LED circuit for a Lobot (from star wars) costume headset that will not be on a PCB or stripboard. It will all be running inside the walls of the plastic shell I am making. Please see ...
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2answers
70 views

Easy bipolar motor control?

Is here some easy way to control bipolar motor without using any other external devices, drivers or shields? I have small motor from CD-ROM so I expect it's low voltage. By control I mean just ...
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1answer
309 views

Arduino connection to brainwave analyzing module

I want to connect a TGAM module (detecting brainwaves) to an Arduino Uno. I know little of electronics, can someone advise me? To which pin of the Arduino should I connect the TGAM? How to get the ...
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3answers
1k views

How to power my Arduino mini using wall socket?

I am trying to power my Arduino Mini (which is connected to IR receiver and a relay board). The idea is to hide the entire setup behind the electrical board including the power supply. I have hacked ...
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4answers
1k views

Pulldown resistors and multiple switches

Maybe this is a question for Electronics SE but I’m not a member there yet so hopefully someone will have an answer here. I did an experiment with having some push-to-make buttons connected to my Uno....
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3answers
437 views

How safe is it to use my body as part of a circuit?

I have two polystyrene balls wrapped in copper tape. When the balls touch, the tape completes a circuit from a digital pin on an Arduino inside one of the balls to an Arduino inside the other (both ...
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2answers
1k views

Making three led's blink at different times in Arduino

I have a breadboard connected to an Arduino Uno, 220k resistors connected to an led, of course it has a common ground and a pin connected to 5v. All pins are digital. Now, I want led 1 to turn on ...
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2answers
505 views

Split Power supply in voltage and gnd?

I am new to electronics and arduino in general. I need to split a power supply in gnd and voltage. Basically, the power supply has one single wire (with the voltage and the gnd passing through it i ...
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2answers
176 views

Proximity sensor without proximity sensor; is my hand magic, my competency crap, or my arduino fried?

here is a very simple circuit, with a LED between pin 2 and ground, and a loose wire in pin 8. Here is the sketch that was intended for use with a small 4-contact switch like these in every arduino ...
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5answers
9k views

LED fading effect using a push button

Guys please help me out in verifying my program for my project -- led fading effect using a push button. My project is simple, I want to start the LED fading effect (i.e., glowing and dimming one ...
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2answers
52 views

Opto Isolator question

I'm building a CANBUS network based on an arduino to go into an offroad racing truck. The vehicle has two separate battery systems, and I would like to monitor the voltage while still electrically ...
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2answers
47 views

Power converting - up or down?

Sorry if there is an obvious answer to this - I'm pretty new at Arduino and electronics. I've searched a bunch, but I think I'm too vague - and don't know what terms to look for. I have a pretty ...
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1answer
8k views

ACS712 sensor reading for AC current

I'm trying to track down a clearly/simply articulated piece of code to take a reading from the ACS712 current sensor (link to download PDF data sheet). I understand that these sensors are noisy, and ...
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4answers
12k views

Connect HX711 to a three wire load cell

I have the following load cells: I'm using the following HX711 amplifier Every guide i can find on the internet describes how to connect a load cell with four wires to the amplifier. How can i ...
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2answers
942 views

Powering arduino and 12V Fan from same supply

I have found a relatively small 12V switching power supply that I want to build into my device, using it to power both the Arduino Pro Mini and a couple of 12V cpu fans. Am I correct in assuming that ...
2
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1answer
375 views

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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2answers
756 views

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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1answer
147 views

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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2answers
328 views

Can I use relays with 10A125V~ for my 220V~ applications, safely?

I am using the TinkerKit Relay Module and recently they changed the relay mounted on the board from a white one with 10A250V~ to a black one with 10A125V~. In my country the voltage is 220V~. Can I ...
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1answer
4k views

Arduino output pin from 5V to 3.3V

I just have a question regarding Arduino output-pins and Voltage divider, because I am getting other results than what my calculations are giving me. I have measured the output-pin (from the Arduino) ...
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1answer
803 views

Why does arduino work on usb power?

The arduino website states that the operating voltage of an arduino is 7-12V. Why does the arduino work powered on just usb then? As usb only outputs 5V and 500ma. Is it preferable to say run the ...
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2answers
1k views

What sensor would detect the black stripe on an analog electricity meter?

I have an analog electricity meter (AEM) and I would like to track my usage of electricity. I've attempted to use the EE-SY310 photo sensor, but that's not sensitive enough it seems. I suspect the ...
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2answers
2k views

How to measure voltage with Arduino analog input

I'm totally new to Arduino and to electrodynamics in general. I'm wondering what happens if I connect my digital pin to an analog input on Arduino, and make digitalWrite and analogRead on the ...
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1answer
258 views

How can Arduino control with a servo with only one wire?

I was playing with getting my servos to be on dedicated power, separate form the Arduino entirely, but obviously controlled by the Arduino. I originally had the ground of the Arduino joined with the - ...
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14answers
49k views

Most compact method of powering Arduino from wall socket

There are a lot of methods to power an Arduino from a large range of voltages: USB cable from PC or from a phone charger or an USB hub step down converters step up converters switching power supply ...
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1answer
142 views

Circuit diagram interpretation and electrical flow

I'm new to Arduino and consequently, to circuits. I've been reading Arduino Robotics by Warren and this was a circuit present in the book. From what Warren has said, electricity in the circuit ...