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Questions tagged [current]

Use this tag to refer to the volume of electricity traveling through any given wire at any given time. It is measured in amps.

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1answer
802 views

Connecting ACS 712 30A to my Solar Panel with Arduino

I am trying to connect my Solar Panel (array of 2 x 265Wp 24v panels connected in series) to my Arduino UNO R3/Nano so that I can make a current/voltage measurement system that can be connected to the ...
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3answers
283 views

Can I drive an LM334(Z) from an Arduino with AnalogWrite()?

I need programmable current control, fading from zero to 2 milliAmps. I was hoping to use Arduino's AnalogWrite(), which uses Phase Width Modulation (PWM) to simulate analog output with a sawtooth ...
-1
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2answers
203 views

Can the Arduino be hurt by connecting too many LEDs in serial?

Today I learned about Vf for leds, after founding out that 3 leds in series driven by 5 V did not make them light up while 2 did. However, I also read that it is quite bad for a power source to use ...
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2answers
2k views

5V usb surge protection for circuit board?

I want to use a mini usb jack to power my device off board, but I want to make sure that the usb power coming in is not any higher than the 5V. I've read a bit about polyfuses but I am unsure if they ...
5
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2answers
26k views

Max current of Vin and 5V pin on Arduino Nano

What is the max current of the Arduino Nano's Vin (30) and 5V (27) pins?
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2answers
574 views

Voltage and Current and Arduino

I put a LED into 3.3V of the arduino and Ground, and it blew my LED violently, smoke was everyone, the whole half top of the led blew up across my room. However, when i program the arduino with Pin13 ...
4
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3answers
62k views

Powering up LED strip - How many amps?

I want my Arduino to drive a LED strip. The LED strip in particular is the 3528 non-waterproof type. To power this up, I need a 12V power supply. My LED strip is going to be 5 meters. Now my ...
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3answers
7k views

WS2812 - First are white and then they turn red/yellow/orange near the end

I'm trying to power about 150 WS2812 LEDs from my ESP8266 NodeMCU board (running NeoPixel Arduino code). The first few LEDs are white, but about half way down, the LEDs turn yellow, then they turn ...
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1answer
4k views

Is there any way to control current precisely with Arduino without using a DC-DC converter?

I have a circuit that consists of a torquer. Its torque is directly proportional to the current in the circuit. I want to precisely control the torque provided by the torquer and hence need to control ...
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1answer
459 views

SparkFun Monster Moto Shield current sensing issue

I am using a SparkFun Monster Moto Shield (PDF) for driving two DC motors. The shield is working fine and I am able to drive the motor in both directions. However, the current sensing is continuously ...
4
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1answer
243 views

Methods to prevent Accelerometer values changing from current spikes

I've connected an Arduino Uno to a MAX7219 IC, which is connected to only one standard 8x8 LED matrix, and an ADXL355 3-axis accelerometer. I use the matrix initially, and turn on all LEDs, while ...
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1answer
1k views

Formula for current through shift register

Hi I am programmer that just started learning electronics and Arduino. I built this simple circuit on Autodesk Circuits earlier. Originally I used 220 ohm resistors. Then when I ran the simulation ...
4
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1answer
26k views

Will 5V 2A current input to the power port kill my Arduino? [duplicate]

I want to power my Arduino with a mobile charger, the out put is 5V 2A, will it kill my Arduino? And what's the max input current as power source?
3
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1answer
2k views

What's Leonardo 5V pin current limit?

I'd like to know how much current can supply the 5V pin and the 3.3V pin on an Arduino Leonardo board. I've been lead not to trust the specs on Arduino's website. And, as an added question, can the 5V ...
3
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2answers
209 views

Arduino Uno VIN 2A

Trying to get started with the Arduino, so I'm trying to do something kinda simple. I'm following this tutorial: Build Your Own Dynamic Ambient Lighting For A Media Center However, I'm still confused ...
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2answers
1k views

How do you use an Arduino to control a 4 - 20 mA transmitter?

I am using an Arduino Mega to control the speed of an AC pump. This can be done by connecting to the variable frequency drive. Here is a link of the relevant datasheet, pages 66 and 67 relate to what ...
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1answer
2k views

ACS712 Not working correctly with Arduino

So I have the basic setup ready with one relay that is controlling a 200W bulb. The Phase of this bulb is passed through a current sensor acs712. While running a simple analog read example sketch, I ...
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1answer
3k views

Understanding flow of current with pull-up and pull-down circuits

I am new to all of this and was trying to figure out what was happening with pull-up/pull-down circuits. I think I understand what happens when the board handles the pull-up/pull-down but I wanted to ...
0
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1answer
286 views

Peristaltic Pump Project

I am designing a peristaltic pump and need some advice for parts. I am using an Arduino Leonardo and also have an UNO and am planning on adding a temperature and pH sensor as well. I have two ...
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1answer
2k views

Is it safe to power the Uno with 18v?

So I'm aware the Arduino Uno can take 6-20 volts, with a recommended voltage of 7-12. But I have an unregulated 12v power adapter, which puts out about 18v with no load. Most of the time the Arduino ...
2
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1answer
2k views

What happens if I draw too much current from ATMEGA IO pin?

I revisited an older device that I made and discovered, that I had an 8 Ohm speaker connected directly to ground and an IO pin of an Atmega328P. According to my calculation that means that the pin ...
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1answer
2k views

How to convert voltage to current from ACS712-20A?

I've been used the ACS712-20A to measure the current flow. Actually I used LIFA program (LabVIEW interface for Arduino). I used this equation: current = ((analog read)-2.5 )/ 0.1 But I am still not ...
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1answer
35 views

What would the total current requirements be for these items?

I'm using 5 of those 8mm NeoPixels + a 5V Trinket. I'm trying to get a rough estimate of the current requirements that would have, assuming all 5 NeoPixels were running at full brightness "white" (...
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3answers
545 views

Low current in a motor used in a line following robot

I'm trying to make a line following robot for my students, the problem is that I have not done any calculations (I don't know how). The motor can't move the robot unless I connect it directly to the ...
0
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1answer
157 views

Measure current and consumption

I'm trying to measure kWh with an Arduino that I have connected to a ESP8266 that communicates this value to a web server I have. And I've been trying to find the best and easiest way to go about this....
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1answer
279 views

How to reduce current from a AC TO DC power supply for arduino use

I have a AC to DC converter that was originally used for recharging the PSP, I stripped the 2 wires of the output and was wanting to use it for my arduino instead of using a 9V battery, it's output is ...
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3answers
102 views

Is that correct that input and output pins are not supposed to have current through them?

Are input and output pins not supposed to have current through them and only either apply voltage or "measure" it?
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2answers
801 views

What minimal resistance should be between an input and output pin not to burn Arduino?

So, I'd like to put a button between input and output pins to read when button is pressed. What minimal resistance should I add to the scheme not to burn Arduino when the button is pressed? Does this ...
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1answer
512 views

How to use unregulated VIN voltage?

I have recently bought an Arduino Mega, and I am powering it with a USB charging port, 5V at 1A. I need to use the 1A with a transistor, since the Arduino itself can only supply a maximum of 20mA ...
2
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3answers
19k views

Max current through an Arduino Mega?

How much current can I put through the pins of an Arduino Mega at the same time? The situation: I am building a 7x7x7 LED cube, and my plan was to multiplex in 7 layers of 49 pins, lighting each ...
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3answers
751 views

The importance of I/O pin DC current

I am thinking about buying Arduino or Raspberry Pi. I generally know Arduino advantages (fast start-up, low consumption, ADC converters) and disadvantages (low memory, low connectivity, hard ...
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1answer
144 views

Issues on Arduino, LiPO battery and two mottors setup

My main objective with this project was to control these two DC motors with an Arduino Nano (it is not a UNO), powered by a 3-Cell 750mAh LiPO battery (both the motors as the Arduino itself). So, I ...
0
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1answer
122 views

Sizing relays for audio circuit?

Non-technical person here, so please be gentle. I moved into a place that has ceiling speakers in each room (I tried, but they don't come apart, aren't marked other than manufacturer, and that is a ...
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2answers
136 views

Driver shield providing 24+ pins at 100mA (for Mega 2560)

Do any shields (or similar boards) exist to let the Mega 2560 (or Due) output a full 100mA per pin on at least 24 pins, in a digital on/off fashion? I know there is a motor shield, but it looks to ...
2
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1answer
995 views

"tamper" circuit of a reed switch: can I connect the two wires to an INPUT and an OUTPUT pin?

While working for the automation side of my new house, I'm currently in the process of installing several reed switches on top of external doors and windows. Even if this could be used as a "...
5
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2answers
1k views

Arduino potentiometer example: what limits the current?

I have a question regarding potentiometer example: https://www.arduino.cc/en/Tutorial/AnalogReadSerial If I turn the potentiometer to the marginal position and have 5V at A0 (and almost zero ...
0
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1answer
655 views

Will this AC-DC converter chip really work with arduino?

I am looking for a compact solution to convert some 220V/20amp AC to something edible by our arduinos (like 5V/2amp DC). I would like to plug directly my arduino to the wall. I found many things like ...
2
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1answer
65 views

What is the Proper Voltage to supply an enough Current to the Arduino

I'm just confused about the supply that I should use in driving my arduino. Is it okay to use a 3.7V with a 1000mAh to supply it? I will be using a Lilypad Arduino. Your replies would be a big help ...
5
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1answer
4k views

ArduinoMEGA: 64 digital inputs cause random digitalRead values

I have 64 hall effect sensors (magnetic field sensors) (DRV5023AJQLPG) connected to an Arduino MEGA 2560. For that, I use 48 digital pins and 16 analog pins as digital input pins. The program in the ...
3
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1answer
505 views

What is the Maximum Current an Arduino can Supply?

I was wondering how much my Arduino I/O pin can output when it is set at Output and is at High. I am using an Arduino Uno R3. Thanks in Advanced.
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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 ...
4
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2answers
7k views

Arduino Power - DC adapter

I have a 12V 2.5 ampere Dc adapter.Can i use it to power arduino uno board? It says on the arduino website that i can use 9-12V and upto 1 ampere. I am concerned with current limit here..
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1answer
5k views

Can I use 5V 1A Adapter to power Arduino UNO?

I have two Adapters, one is rated as Output 12V 500mA (used to power an old modem) and another one is rated as 5V 1A (old mobile phone charger). My question is can use any of these to power my ...
1
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1answer
502 views

How can I power an Arduino in a 3-phase environment?

I am working on a project which uses an Arduino board. Currently I am testing my device using 2-phase power and it works fine. I want to use that device in agriculture fields where 3-phase power is ...
0
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1answer
4k views

How to measure relay current draw from Arduino

How does one measure the amount of current a relay is drawing from an Arduino? Do I connect a multimeter in series with the digital pin to which the relay 'IN1' is connected (in this case pin 7), ...
2
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2answers
2k views

Circuit doesn't work when multimeter/current meter is attached

I'm working on a battery-powered data logger, using a bare Atmega 328. I'm using sleep between sensor readings, via the Narcoleptic library. Everything seems to work fine, until I connect my ...
0
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1answer
43 views

How much voltage/current do I need for multiple chips?

I have a Huzzah ESP826 Wifi breakout chip which requires 3.3V power voltage and peaks at 500mA of current, and an LED strip which requires 12V and 1A. How can I power both with one dc jack (I have a ...
0
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1answer
2k views

Powering multiple servos on external battery

I am working on a project with my school's 3D Printing Club where we are making a humanoid robot and I am attempting to wire the arm at the moment, and program the hands to translate text to sign ...
0
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1answer
133 views

how much current does Arduino Nano draw when only using 8 digital pins?

I want to connect an Arduino Nano to an Intel Minnowboard Max (it's like a Raspberry Pi). I know Arduino can draw up to 500 mA current through the USB connection. Since I already need the USB to ...
2
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2answers
381 views

Deviation of power consumption between datasheet and real world?

According to the Atmega328P-PU Datasheet (side: 589) the current consumption of the microcontroller should be around 9.5mA (at 16MHz and 5V). But I measured 15mA. (Nick Gammon who did some pretty good ...