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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3
votes
2answers
6k 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..
5
votes
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 ...
2
votes
1answer
56 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 ...
3
votes
1answer
4k views

Do I need to use a resistor if I am using a potentiometer to control an LED's brightness?

I am currently tinkering with an arduino, and am using a potentiometer to change the brightness of an LED. I understand that usually, a resistor is added to the circuit to limit the current flowing ...
2
votes
1answer
910 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 "...
2
votes
2answers
343 views

Does the square-wave nature of PWM dictate how much resistance you need?

I think the answer is yes, but I wanted to ask the question anyway for future common reference. And to check my understanding. Say I want to power 10 LEDs with PWM with my Mega 2560. I have a bunch ...
2
votes
1answer
415 views

Using Arduino Micro With 12V Buzzer

I have an interesting situation. I wonder if anyone can help? I have: 4x Arduino Micros loaded with the basic Blink sketch 5x 12 volt buzzers A desk full of completely fresh Duracell AA and 9v ...
2
votes
2answers
343 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 ...
2
votes
4answers
1k 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
3answers
611 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 ...
1
vote
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 ...
0
votes
1answer
203 views

How does an analog input pin work?

I have a potentiometer of 10k and I connected it this way: 5v -> potentiometer -> analog input pin of Arduino When I turn the potentiometer I change the resistance of the circuit but in the Arduino ...
0
votes
2answers
862 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 ...
-1
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3answers
95 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?
-2
votes
1answer
215 views

Infrared led and sensor: how it work [closed]

I am having a difficult time to understand how an infrared sensor and led work. I have an infrared LED (like the ones you buy anywhere), does it mean that the infrared LED has the frequency os 38khz? ...