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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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1answer
28 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
57 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
27 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
18 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
49 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
74 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
18 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
52 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
51 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
324 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
63 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
46 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
89 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
36 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
votes
0answers
376 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
987 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
47 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
53 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
286 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
72 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
74 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
48 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
116 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
559 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
58 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
328 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
113 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
65 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
188 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
vote
0answers
313 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
617 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
25 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
862 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
477 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
86 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
4answers
406 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
58 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
321 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
737 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
2k 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 ...
2
votes
4answers
722 views

Power suply for MicroSD card breakout board

I'm developing a project and I need to connect to my Arduino Mini with a SD card breakout board. The problem is that I can't plug it directly to the Arduino since it is already powering some sensors ...
1
vote
2answers
1k views

Run 5V/2.3W water pump on Arduino Pro Mini 5V

I want to build up my automatic water pump with an arduino pro mini 5v and a 5v usb water pump (2.3 W). As I understand, I cannot power the pump directly through the vcc pins of the board, right? ...
4
votes
2answers
266 views

7805 powered Atmega328 Stops working when input of 7805 exceeds 7volts

I am developing a circuit with atmega328, the MCU is powered by a LM7805. The input of 7805 is given by a variable supply. Till the input of 7805 is 7volts, the output voltage is 4.9volts and current ...
0
votes
1answer
356 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 ...
0
votes
3answers
113 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 ...
0
votes
2answers
97 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 ...
0
votes
2answers
635 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 ...
0
votes
2answers
7k 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?
1
vote
2answers
339 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 ...