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.

Filter by
Sorted by
Tagged with
0
votes
1answer
64 views

Driving higher loads with PWM

My Arduino Pro Micro can source 500mA from 3.3V VCC, when it is USB powered. The chip itself, is rated for 200mA, though, and its output pins for 20mA recommended, 40mA max. I am looking to have 3 PWM ...
0
votes
2answers
75 views

How do I find out the maximum current through VIN on a NodeMCU board?

I read this answer https://arduino.stackexchange.com/a/51878 to a different, but related question. It seems like VIN on the NodeMCU is directly or via diode connected to the USB connector. Image ...
2
votes
1answer
53 views

Pull more than 250 mA from powerbank-powered Teensy 3.6

I'm using a powerbank speced 5V at 2.4A to power my Teensy 3.6 via the USB port. However, Teensy recommends to not pull more than 250 mA from its 3.3V pin. Is there any way I can pull more current, at ...
1
vote
0answers
42 views

PZEM-004T can't read current

I'm trying to measure the current, voltage, and power of AC load using Peacefair PZEM-004Tv3.0 module. For the serial communication of this module, I'm using SoftwareSerial Pins 2 and 3 on Arduino Uno....
0
votes
1answer
78 views

Safe to power LED strip via ESP32 GPIO

I want to rewire a battery powered LED strip (as shown in the picture below) to power via an ESP32's GPIO pin. I have a ESP32 NodeMCU Development Board, powered via USB. The LED strip has specified 3,...
1
vote
1answer
40 views

LEDs not lighting up even though current is flowing through them, problem with ground?

I'm using a 74HC595N shift register to light up 8 LEDs but for some reason they won't turn on even though current is flowing through all of them. I provided an image of my circuit below, there is a ...
0
votes
1answer
38 views

Is it possible to use the same power source for the arduino and a high current

I've need to control some leds which draw 300mA with an arduino (actually an atmega) and after some searching I think the following is the circuit I need, but I'm not really sure if the power source ...
0
votes
1answer
103 views

MAX471 giving too high current readings

I want to measure current using the MAX471 sensor that outputs voltage proportional to the current (1V/A according to the datasheet). To test the module, I connected a 330 ohm resistor to the sensor ...
0
votes
1answer
26 views

Can I run 3 motion sensors with a voltage regulator?

I want to power 3 hc-sr501 PIR motion sensors with a voltage regulator that can output 5v-1A. If I make such a system, will there be a noise?
0
votes
1answer
84 views

What's wrong with the ACS712 sensor?

I have two ACS712 sensors, one rated for 5A, another—for 20A. I wanted to test how precise they are, and played with different devices (in my case, old PC fans). I copy-pasted the source code from ...
0
votes
1answer
102 views

INA219 with L298N POWER LOGGER

I Have been working on a power logger with INA219 and L298N the thing is, the voltage and current displayed on Serial Monitor is not the same on my multimeter. the Arduino is connected to the pc to ...
0
votes
1answer
91 views

Weak Arduino Output Pins

Sorry if this is a newbie question, but I'm really struggling with this and I can't seem to figure it out. I've been learning Arduino for a while, and for my next project I'm attempting to build a ...
2
votes
0answers
59 views

Possible impedance problem when moving to new power supply

I'm working on building an LED matrix and I'm using an LED strip to create it. I've worked through a simple wiring setup using my bench top power supply and got a strip test working. Now that I have ...
0
votes
1answer
74 views

Variable Fan Controller - Properly Sized Transistor

I would like to a build a temperature sensing variable speed fan controller for my truck. Currently using a purchased 2 speed on/off relay based controller, but my fans are overloading the whole ...
1
vote
0answers
76 views

To reduce the Attiny85 current consumption

I am using Attiny85 to control 4 LEDs parallelly with a programmable switch. But even though when the LEDs are in OFF state, current consumption is around 7-8mA. I am using a 200mAh battery in my ...
1
vote
0answers
73 views

using a digital pin on node mcu as an analog

i want to use volte and current sensors (ZMPT101B and ACS712) on node MCU these sensors are analog but node mcu has on analog pin can i use digital D0 pin for voltage sensor?
-1
votes
2answers
64 views

Connect 12V 38A battery to SIM800C GSM Module

I have a gsm module that is rated for 12V and 1A. And I also have a drone Battery that is 12V and 38A. Would it hurt the gsm module If I connect it to this high power Battery? I heard It's voltage ...
1
vote
1answer
174 views

Current Sensor ACS712 not changing its value even when connected bulb is lit

My task is to find the amount of current a light bulb uses, with that motive I used ACS712 current sensor of 30A connected all the connections properly as shown in the circuit diagram below I tried ...
2
votes
1answer
57 views

Do the I/O pins on Arduino read current or voltage?

So I've recently started Arduino and I just had a question about the digitalRead() function. Does the IO Pins read Voltage or Current? The reason I'm asking is because of the attached circuit. So IO ...
0
votes
2answers
179 views

Dimming this ~30V led with PWM, what do I need?

I have a street lamp with a led and simple driver in it, I don't know the exact led voltage but the driver (image attached) says 27-36V DC output, MODEL: 50W. Is there a part I could place between ...
0
votes
0answers
121 views

LEDs lighting up when off due to servo motor being on

Within my arduino project I have began to run out of GND ports on my arduino so I am having to resort to using 1 GND port for lots of electric components. I have 2 LEDs that are each connected to a ...
2
votes
0answers
41 views

How to make 16 coin vibration motors and 5 servos work at the same time on a Arduino Mega?

I saw in Arduino Mega's datasheet that the sum of currents out of all input/output pins combined should be maximum 200mA. But I want to make 16 vibration motors and 5 servos work together on the same ...
2
votes
1answer
86 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 ...
0
votes
2answers
159 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 ...
1
vote
1answer
171 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....
3
votes
1answer
92 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, ...
0
votes
1answer
186 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 ...
0
votes
1answer
53 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 ...
1
vote
1answer
80 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(...
1
vote
2answers
304 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 ...
1
vote
0answers
52 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
votes
1answer
188 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 ...
-1
votes
1answer
69 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 ...
0
votes
1answer
43 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, ...
0
votes
1answer
93 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?
-4
votes
2answers
938 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 ...
1
vote
1answer
410 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 ...
0
votes
1answer
219 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 ...
0
votes
3answers
799 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 ...
1
vote
2answers
274 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 ...
0
votes
1answer
93 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 ...
0
votes
1answer
815 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 ...
1
vote
2answers
352 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
votes
1answer
260 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 ...
1
vote
2answers
3k 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 ...
0
votes
2answers
83 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 ...
1
vote
0answers
72 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....
1
vote
0answers
68 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 ...
0
votes
2answers
92 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 ...
0
votes
1answer
149 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 ...