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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.

0
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3answers
57 views

Arduino max power supply limit

What is the maximum current that can be supplied to an Arduino Mega board before frying/breaking? Basically i have several components connected to my board which draw a total current of 1.6A (which i ...
1
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0answers
8 views

Selection of External CT for my application

Here I have attached my ckt for my application. My application is Motor protection Relay. Based on Current sense of 3 CT tripping of relay will occur. Tripping might due to under/over/SC/Locked rotor ...
0
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0answers
34 views

Can I put a resistor in the ground connection of my DHT22 sensor?

I'm building a project that uses a couple of Adafruit DTH22 temp/humidity sensors. (https://www.adafruit.com/product/385) I have them wired into my project box through 3.5mm mini plugs (The kind that ...
0
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2answers
44 views

Can you current-limit Arduino 101 GPIO pins?

A number of questions ask about max possible in/out current on a GPIO pin, that's not my question here. I'm asking if it's possible to set a maximum current limit on a GPIO pin, such that any attempts ...
0
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0answers
33 views

Checking Arduino 5/3.3V under load

Is there a way to use common/cheap components to put the 3.3V and 5V pins on an Arduino under load, in order to measure if they are giving a correct and stable voltage? Can I calculate a certain load ...
0
votes
1answer
30 views

Trying to power multiple servos at once using a Arduino Mega

Recently I have been trying to do a project for my end of year project, it involved making a humanoid arm. I am still a newbie at these things, I usually have my friend do the wiring, but since he ...
0
votes
0answers
25 views

Question about controlling servos with PWM while being able to accurately read the current from a sensor

Hi I am hoping to design a custom board ATMEGA32u4 with practically a Arduino leonardo bootloader. I plan to control up to 12 servos while being able to read back the current sensor voltage of an ...
0
votes
1answer
60 views

Detect power interruption on NodeMCU

Im using a 5v 1A power supply and connected to VIN pin on the NodeMCU. I also use 18650 battery to keep NodeMCU running in case the power supply shuts off due to power interruption. I'm planning to ...
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0answers
48 views

Transistors to use for eight voltage sweeps from two PWM Arduino pins

On my Arduino Mega, there are two PWM pins open. There are eight analog voltage inputs to a datalogger. They are connected through a PCB, and I need test them with a DC voltage sweep. (There are many ...
0
votes
1answer
44 views

Addressable RGB LED Strip

I am looking to create an addressable RGB LED strip circuit with my NodeMCU v3 Wi-Fi. I am looking at a strip of 150 RGB LEDs, 5 meters long, so 30 LED/m. But I am only going to use about 50 LEDs for ...
2
votes
2answers
61 views

Arduino UNO socket

As I learnt so far is that Arduino UNO board has a socket for power input. The available power input range is between 7V - 20V, but the optimal usage range is 7V-12V. Here I am wondering: ---> if ...
1
vote
1answer
32 views

Powering arduino and node mcu [closed]

I want to power up my Arduino and my Nodemcu via 12 V , 1 A power adapter (it's an AC to DC power Adapter). Recently I have two voltages regulators: a 5 V for nodemcu and 9 V for Arduino Uno. The ...
0
votes
1answer
41 views

How to connect Mg995 and arduino nano since nano can only output 40mA at max?

Datasheet for Mg995 shows: Current draw at idle 10MA No load operating current draw 170MA Stall current draw 1200MA Maximum current that an arduino nano can output is 40mA. So, what ...
0
votes
1answer
63 views

Is it correct to use a 9V 1A transformer to power my project?

I have a quick question: I have a small alarm project running on an ArduinoNanoV3 (a chinese clon). Counting sensors, actuators and the arduino itself the consumed current (theoretically speaking, ...
3
votes
2answers
81 views

Controlling voltage and current from chip?

I'm well aware that this question perfectly showcases my spectacular ignorance, but oh well. It's a simple enough question, so here we go. I have a 595 chip (SN74HC595) wired up to an Arduino, fed by ...
1
vote
1answer
26 views

Motor shield not providing enough current to 2 12V DC fans

I have 2 fans and they require up to 3A current, but my motor shield (Arduino Motor Shield Rev3) on my Arduino MEGA can only provide 2A per channel (4A max). Is it ok to run the fans at a lower speed ...
-1
votes
1answer
53 views

Only one of 4 LEDs are lighting up

Before you ask - I've checked that the LEDs worked before putting them in my circuit. They all work. I've connected 4 LEDs, shown in the arrangement below, up to my Adruino Lilypad. Pin 9 was used as ...
-1
votes
2answers
63 views

Max current per pin is 40 mA. But it is always 40 mA?

I need to calculate resistor for a PNP transistor. To do this I need to know the voltage and current. I know voltage is 5 volts as it is easy to find in the internet, but how about current? I mean ...
3
votes
2answers
469 views

Attiny85 appears to be drawing 0.2mA current but battery running down more quickly

I am trying to get a temperature sensor (tmp36) working with an Attiny and if possible I would like it to run for several weeks. I have tried to power down the Attiny and it appears to be drawing only ...
0
votes
2answers
68 views

simultaneously read 16 hall sensor and maximum current allowed by Arduino

My question is about maximum current allowed by Arduino. I know it's 200mA in Arduino and 40mA in every pin (lower in arduino mini). Just wondering if simultaneously read 16 hall sensor (than can be ...
0
votes
1answer
48 views

Designing around Output pin limitations

I'm new to Arduino and am working on a project with my son. We are using the LillyPad USB board (schematic) to drive a bunch of LEDs (LED Datasheet). Our project is based loosely off of the 'Turn ...
1
vote
1answer
102 views

Circuit works on breadboard but has power problems on protoboard

I'm building a simple circuit that takes data from an IMU (using MPU6050), sends it to a microprocessor (Arduino Pro Mini 5V) to apply data smoothing and averaging, and then this data is sent using an ...
0
votes
1answer
37 views

Grove A12-200 current sensor

I am trying to measure current from an LFG with Arduino Uno and Grove current sensor (A12-200). I found a code at this link you can see Arduino code here. The code works, but there are some ...
0
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0answers
450 views

Power supplied by WeMos D1 R2

I've tried to measure power supply from a WeMos D1 R2 to devices connected to it (sensors, relays, servos) but could not reach a limit where the microcontroller stops working in order to know its ...
0
votes
3answers
1k views

Combining code for multiple sensors (Current and Voltage Sensors) in one program

I need to operate 2 different sensors (Current and Voltage) simultaneously. I have managed to run each one of them separately and I don't know how to manipulate the code so they could work together. ...
0
votes
1answer
48 views

Light Powered Motor Troubles [closed]

I'm working on a small car (<1 kg) which will drive when there is light and stop when there isn't. Below is a plan with code drawn up (the only numbers I know for sure are the current gains for the ...
0
votes
2answers
61 views

Arduino Voltage Divider

So am doing a project which involves the reading of voltage and current generated by Solar Panel. Now I learnt that Arduino cant Read Voltage directly above 5V. To read above that you need to add a ...
1
vote
2answers
331 views

Unstable ESP8266 - flickering lights

A while ago I have bought NodeMCU board along with few sensors to play with. I have coded everything, and, when powered via USB, works like a charm. Problem begins, when I try to use my contraption as ...
0
votes
1answer
88 views

Non intrusive current sensor with unreliable (strange) readings

I have a project where I will mount 6 non intrusive current sensor model SCT013 (100A/50mA) manufactured by yhdc.com on an Arduino Mega. Virtual ground and Burden resistors are 1% tolerance. To ...
0
votes
1answer
82 views

Voltage divider for 6 non intrusive current sensors

I have an Arduino project where I intend to use 6 non intrusive current sensor model SCT013 (100A/50mA) manufactured by yhdc.com As reference voltage on examples I find at the internet it is ...
0
votes
1answer
51 views

Powering arduino sensors - what resistor should I use?

Recently I have asked a question, why my sensors do not work on external power supply (link). I have found out, that I was limiting the current too much with the resistors. I have tried using two ...
0
votes
2answers
126 views

Arduino current output [closed]

Simple question: I'm researching before buying. Can any of the Arduino products output current on a 4-20mA scale? I've seen them with Analog inputs but not outputs. And if they do not, are there add ...
0
votes
0answers
626 views

ACS712 wrong output (AC current)

I'm trying to measure current with arduino Mega 2560 and ACS712 module. First i just wanted to see a graph of input when nothing is connected so i used this code: int sensorValue; void setup() { ...
0
votes
2answers
76 views

Detect if a 3 phase AC submersible pump is on

I need to know when a 3 phase AC submersible pump is turned on, for the sake of logging it to a online database. Thing is, I do not know how tell if it is ON, or OFF. I've given a thought to using a ...
0
votes
2answers
381 views

Setting reading frequency SCT013 current sensor code using Arduino Uno

I found this code below for the Arduino platform to obtain current measurements from the SCT013 sensor, and I am wondering how can I define the 'delay' or 'frequency' of my readings? I'd be looking ...
0
votes
1answer
129 views

In a circuit with a switch and a pull-down resistor, why does the high impedance of the input not discourage current from flowing into pin?

I'm a beginner to Arduino and circuits. I've spent the last couple hours hung up on the concept of how current flows through switches and pull-down resistors, having read every thread and watched ...
0
votes
2answers
77 views

Current Draw for LED Projects

I am working on a project with LED strips that would consume 12V and 20A. The problem is that the household wall outlet limitation is 15A, and 20A current draw would potentially start a fire. I have ...
0
votes
0answers
202 views

acs712 zero point problem

I have Arduino Uno R3 with: Ehernet shield 4x ACS712 20A boards measuring AC current 4x relay board. Power supply is wall mount USB adaptor 5V 2A. If all relays is off, measured voltage in arduino ...
1
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0answers
373 views

PWM output maximum current

i made a project with arduino in wich I used arduino to activate 18 n-ch mosfet with PWM. I used the softPWM library to use PWM in 18 output pins, I used a nano v3. The question is about the maximum ...
0
votes
1answer
661 views

Controlling ceiling fan speed using Arduino [closed]

Reference: https://arduino.stackexchange.com/a/12000/37585 Based on this post, if I want to control a 120V AC ceiling fan with an Arduino, there's a complicated bit of electronics that needs to be ...
1
vote
0answers
26 views

Arduino Mega and other modules power consumption [duplicate]

I have an Arduino Mega 2560 to which I have connected: Arduino GSM Shield 2 Waveshare 10 DOF IMU sensor Waveshare NEO-7M-C (B) GPS module HC-05 ZS040 Bluetooth module I am feeding my Arduino a 12V ...
1
vote
1answer
1k views

Arduino digitalWrite not working

I am trying to control this OWI Robotic Arm using the Arduino's digital outputs (I am using pins 12 & 13). If I wire up the wires to ground and 5V it goes one way, if I switch the wires, it goes ...
1
vote
3answers
1k views

Arduino Pro Mini maximal and recommended current per pin

In Arduino Pro Mini (3.3V) specs indicated the maximal and recommended current per pin, 40mA and 20mA respectively. Does these values means input current (i.e. safe input current Arduino can handle) ...
2
votes
1answer
540 views

Problems with ACS758 Hall Effect Current Sensors - Calibration and no Signal

I purchased 3 ACS758 Hall Effect Current Sensors datasheet on ebay. A 50,100 and 200A, all three are bi-directional. They look like this. With no current the 50A outputs 477 on the analogue input (2....
0
votes
2answers
96 views

Getting more current through an LED array

I have an Arduino Uno controlling an array of 24 LEDs (datasheet). I understand these LEDs are ultraviolet and have a forward current of 0.5A. My power source (12V 2A) is wired to a switch which is ...
1
vote
3answers
513 views

Turning on many (30) leds arduino mega

I´m new working with Arduino. Right now I have a project thar requires to turn on 30 LEDs at the same time with an Arduino Mega. The problem is that it would exceed the max current that the chip can ...
0
votes
1answer
60 views

Powering leds from arduino with adapter

Sorry for having (again) a beginners question, but I was wondering something. If I would want to drive like 20-30 LEDs from an Arduino (Uno), and I want to use an external adapter (12V, 1A), going ...
4
votes
1answer
336 views

Measuring voltage from -12 to +12 VDC

I'm making a -12 to +12V DC regulated power supply, on which I want to measure voltage and current with Arduino (through a voltage divider, of course). I'm not sure, how to either detect nor measure ...
0
votes
1answer
794 views

ESP8266-01 connected to Arduino Mega - Current output?

I was thinking of powering my arduino with an external 9 V power source, but I am still trying to figure out the best way to get the right amount of current for the Wi-Fi module. Should I use an ...
2
votes
2answers
3k views

Can I share the VCC (5V) on my Arduino Pro mini with multiple modules?

Right now I am onto a new project where I am building an obstacle avoiding landrobot. I use an arduino pro mini as my board and I have a few hc-sr04 sensors here at home. The problem I have right now ...