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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19 views

WS2812B Power Supply

I have a WS2812b addressable RGB led ribbon that is 5m (150 RGB leds). I purchased a 5v 10amp power supply to power it; however, whenever I try to use it to power the LED strip the leds start flashing ...
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2answers
48 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
35 views

ESP8266 NodeMCU 3v3 current for fingerprint sensor

From what i see that 3.3Vpin provide 3.3V and 400mA. The fingerprint module i use is AS608. Connecting the fingerprint module power pin to 3.3V of the nodemcu. From the datasheet it only can handle 3....
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1answer
57 views

What is the maximum “wattage” can be pushed into an ATMega328 ADC pins?

I was doing some Ohm's Law calculations to calculate the voltage output from a 2-resistor voltage divider, the input will be with a maximum of 12 volts, I want the ATMega328 to measure that voltage, ...
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1answer
40 views

Motor cutting out when using HC-05 Bluetooth module

I'm using an L293D motor driver chip along with an HC-05 Bluetooth module. The two work as expected separately - I can send a string via a Bluetooth terminal app on my phone to the HC-05 and I see it ...
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1answer
41 views

Understanding the variation of Arduino's current consumption with respect to the voltage supply

Even though this is already a well-debated topic, I couldn't find an extensive discussion about what really is drawing so much power in Arduino's board. Here is the preamble: I have an Arduino Mega ...
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1answer
56 views

Is it possible to overload the digital pins for an Arduino?

I worked on an Arduino project for school that was a self-driving security robot that also acted as a smart home system. It was essentially a self-driving Roomba-like car that included several LED's(...
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1answer
50 views

What current is safe for Wemos d1?

I've got 12V / 400mA power supply for my Wemos D1 R1, and I'm using VIN output(I need 12V for led strip). I need to change this power supply because of color, and I can't find similiar with the same ...
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0answers
40 views

External vs arduino power supply for servo motors?

I recently created a project that involves the control of three SG90 servo motors. I started off by controlling this through the 5V output pin of the Arduino Uno, with the Arduino powered through the ...
0
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1answer
34 views

How to control one Mosfet with another mosfet

I've got 4x 12V 6a peltiers and some 3d printer mosfet controllers to drive them using PWM with my arduino. But I've found the mosfets need ~7V to switch on, so I'm now wanting to control them with ...
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1answer
52 views

Reading sensor with current ouput with Arduino

I am having diffuclt times with this sensor, so I kndliy ask for your help! The sensor is named "SPUVA-CS-C3535-A", datasheet here. The sensor I use (cs3535) has just two pins (+ and -). From my ...
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1answer
40 views

Why does per-led current consumption diminishes when more leds are on?

I'm rather new to Arduino. I've been performing some current consumption measurements lately, with a INA219 current sensor, on the blue LEDs from a starter kit. I plugged three LEDs, on pins 2, 3, ...
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1answer
63 views

Which board has the highest max current via 3.3v pin?

Is there any arduino board which can deliver 600-800ma via 3.3v pin? Maybe the Arduino due or the nano 33 ble?
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2answers
200 views

LCD is supplied more than required current [closed]

So, i am trying LCD 16x2 module for the first time and don't how solve this problem. I know the current is more, also I've tried using Resistors, etc. but to no avail. Please suggest a solution. Also ...
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1answer
188 views

Measure current across shunt resistor (Power Analysis)

I am trying to reproduce the side-channel power analysis attack described in this paper: https://pdfs.semanticscholar.org/7946/a8ee82658e2ffb017270331f220a55f5ace6.pdf for educational purposes. The ...
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1answer
76 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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3answers
345 views

Digispark Attiny85 draws more power for digital input than expected

I'm trying to figure out why my attiny85 (on a digistump developer board) draws around 3mA at 3V when setting up a pin as INPUT and connecting it straight to ground. The current is measured with a ...
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2answers
146 views

Measuring current directly with Arduino

Is it safe to measure current like this as long as measured voltage drop don't exceed 5V? I'm asking this because in almost all current sense circuits they used an opamp in their design. Do I need a ...
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1answer
55 views

Running many devices on 5V pin. How to provide external power

I'm using my Arduino DUE 5V pin to power a lot of sensors and I'm worried about the drop in current. I'm powering the board using the USB port. Is this the correct way or is there a different way of ...
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1answer
416 views

ADS1115, ACS712 and ESP8266

I have an ACS712 (5v sensor), an ADS1115 (5 or 3.3v) and an ESP8266 board (3.3v). I know I can't directly use the ACS with the ESP without a voltage divider on the analog pin. So I figured I could ...
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2answers
207 views

Feeding microcontroller and linear actuators (motors) with the same power supply

I have already made a diagram using a motor controller. I want to use only one power supply to feed arduino and motors. I want to use MDD10 dual motor driver. The details of the actuators each one is:...
0
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1answer
163 views

Problems / doubts on battery-powered Arduino Nano WiFi weather station I built

I've almost finished my first Arduino project and I'm realizing I might have gone a bit over my head - I'm a web programmer, I have a very basic electronics knowledge and started tinkering with ...
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0answers
143 views

Can too much power consumption cause NodeMCU to trip?

I made a home automation setup that involves a NodeMCU and a 5v relay module. Now, this setup automatically disconnects from the WiFi randomly. It sometimes connects immediately, sometimes it takes a ...
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2answers
1k views

Current consumption of a buzzer

I want to use the buzzer KPEG2000 in my Arduino application. I would like to know if a GPIO can directly drive this buzzer, without destroy the uC (a GPIO can deliver 40 mA max). In the datasheet, we ...
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2answers
78 views

Handling arduino output current

I need to power an actuator that requires 12 volts and consumes between 5 and 10 amperes depending on the weight it is charging. Therefore I bought a power supply of 12 volts and 10 amperes. My ...
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0answers
53 views

ACS712 Module inaccurate reading in some devices

I'm currently trying to isolate what's the problem with a current sensor build I'm working on right now. I'm using a ACS712 that can handle 30A, I've used the code at http://henrysbench.capnfatz....
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0answers
36 views

Min/Max current for supply input of mega2560

What is the min and max current the mega2560 can take for the 5v supply input voltage of the chip itself, not just the arduino mega?
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0answers
41 views

Shall an active piezo buzzer module draw as much as 10mA on its signal pin?

I have connected an active piezo buzzer to my arduino: KY-012 Active buzzer module. I was a bit surprised that it drew like ~10mA on the signal pin from my nodemcu, which I find a bit weird, since ...
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2answers
48 views

How many Amps can a Nano Arduino hold for LED project

I'm really new at this, and here is my doubt. What if I need to light 120x WS2812B (5v)LEDs (link: LEDs) using an Arduino Nano? if it takes 60 mAh each pixel, the total amount needed should be around ...
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1answer
96 views

Connecting DAC output from Arduino Due to another arduino

I have an Arduino Due and I want to connect the output from the DAC as an input to an Arduino Uno's analog input pin. From this link http://forum.arduino.cc/index.php?topic=164763.0, user DuaneB ...
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2answers
78 views

How do I provide a negative current?

I'm trying to use an ATMega328 board to control a board of a broken UPS device. I replaced all the internals of the UPS by custom components, so the only things which remain are the chassis and the ...
0
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2answers
498 views

Outputting 400 mV using Arduino Nano PWM pin

I am trying to output analog voltage (400 mV) using Arduino Nano PWM pins. Is it okay to directly connect (using jumper wires) the PWM pins to the Vin+ of the INA219 current sensor? I badly need it ...
0
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3answers
147 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 ...
2
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0answers
23 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 ...
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1answer
78 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
161 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 ...
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0answers
42 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
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1answer
264 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 ...
1
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0answers
55 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
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1answer
478 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 ...
1
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0answers
96 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
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1answer
139 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
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2answers
77 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
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1answer
45 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
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1answer
251 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
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1answer
116 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, ...
2
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2answers
145 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
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1answer
61 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
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1answer
62 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
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2answers
312 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 ...