11
votes
Will 5V 2A current input to the power port kill my Arduino?
"I want to power my arduino with mobile charger the out put is 5v 2apms will it kill my arduino?"
No! It won't. Even tough the reason has been already explained in this other post, I want to add ...
- 454
9
votes
Accepted
Max current of Vin and 5V pin on Arduino Nano
It's hard to say. The maximum the on-board regulator can provide is 800mA. However the actual amount it can provide at any time depends on other external factors - most notably:
The voltage of your ...
- 105k
8
votes
Accepted
Powering up LED strip - How many amps?
Usually strips have not individual LEDs, but are composed of a lot of "pieces" in parallel, and each piece is composed by three leds in series along with a resistor.
Usually the strips are composed ...
- 2,721
6
votes
Accepted
Circuit doesn't work when multimeter/current meter is attached
Multimeters have something called a "burden voltage". See this PDF: uCurrent - A professional precision current ... - EEVblog.
Also see Dave Jones' video: µCurrent
Meters measure current by dropping ...
- 37.6k
6
votes
Arduino Power - DC adapter
Don't worry about the current limit. The board will only draw what it needs. The spec is telling you that the board can draw as much as 1 amp, so in general the power supply should be able to supply ...
- 1,651
6
votes
Accepted
What is the Maximum Current an Arduino can Supply?
40.0mA.
The Arduino UNO Digital IO pins are connected directly to the IO pins on the ATMEGA328P processor.
From page 299 of the data sheet for that processor...
Note that there is also a total ...
- 1,553
5
votes
Accepted
Arduino potentiometer example: what limits the current?
A0 input is high impedance, so very little current is flowing into A0. The value is so small that you can simplify that it flows only from +5V through the potentiometer to GND.
For some applications, ...
- 621
5
votes
Accepted
Will this AC-DC converter chip really work with arduino?
What do you think about it ?
If you have to ask, don't do it. Mains voltage can be dangerous and should only be done if you know what you are doing and how to be safe. The best choice is to just use ...
- 1,099
5
votes
Accepted
What happens if I draw too much current from ATMEGA IO pin?
There's a few crude calculations you can do using some numbers from the datasheet.
This graph is in the datasheet:
It shows the voltage dropped by the high-side MOSFET driver in the IO pin for ...
- 105k
5
votes
Accepted
WS2812 - First are white and then they turn red/yellow/orange near the end
See Powering NeoPixels.
Each individual NeoPixel draws up to 60 milliamps at maximum brightness white (red + green + blue).
...
To estimate power supply needs, multiply the number of ...
- 37.6k
5
votes
Accepted
Attiny85 appears to be drawing 0.2mA current but battery running down more quickly
2.9V doesn't sound too bad. See a datasheet for the CR2032 I found:
It looks like slightly more than 2.9V would be the expected voltage for up to 600 hours.
3.2V looks like it is fully charged, and ...
- 37.6k
5
votes
Accepted
Controlling voltage and current from chip?
You're misunderstanding what you need to drive a transistor.
A transistor will allow up to a specific amount of current through the collector depending on the current that flows through the base. If ...
- 105k
5
votes
Accepted
Is it correct to use a 9V 1A transformer to power my project?
in all places recommend not to use sources that give currents greater than 500mA when you are going to feed it by the pin VIn with 9V.
Nowhere says that. They say you should not draw more than 500mA ...
- 105k
5
votes
Arduino max power supply limit
1A coming in thru the barrel jack connecor, then you risk blowing the 1A rated reverse polarity protection diode. The 5V regulator will overheat at high currents above 7.5V. The chip itself can have ...
- 2,407
5
votes
Accepted
Understanding the variation of Arduino's current consumption with respect to the voltage supply
There is a basic error in your methodology which leads to incorrect conclusions.
You cannot determine what is going on from just two data points. Instead you need far more.
Here is a voltage sweep ...
- 105k
5
votes
Dimming this ~30V led with PWM, what do I need?
It will not be possible for you to PWM dim your LED with that LED driver (power supply).
That is a constant current driver with under/over-voltage protection. It delivers a specific amount of current (...
- 105k
5
votes
Do the I/O pins on Arduino read current or voltage?
They read voltage. When you close the pushbutton switch the input should have a 0V or digital "0" on it. When you open the pushbutton the resistor should pull the input to 5V or digital &...
- 1,035
4
votes
Accepted
ACS712 sensor reading for AC current
Measuring the peak-to-peak current and scaling the result will get you an answer which will at least go up and down with the magnitude of your average AC current, so yes it is NOT incorrect. As you ...
- 136
4
votes
Arduino Power - DC adapter
Make sure that the adapter you have is the correct polarity for the arduino or it won't work.
The barrel jack is centre positive, so look for this symbol on your adapter:
The barrel jack should have ...
- 304
4
votes
How to reduce current from a AC TO DC power supply for arduino use
You don't need to reduce the current.
2000MA (2 amps) means the power supply is CAPABLE of supplying this (without overheating). Anything less than this, and your device will work perfectly.
Your ...
- 2,373
4
votes
Powering up LED strip - How many amps?
1) Is it important on how many amps, my powers supply will feed?
Yes. You need the PSU to be able to supply as much current as you will need for everything you are powering form it.
You don't say ...
- 2,181
4
votes
5V usb surge protection for circuit board?
A polyfuse will limit current not voltage.
There are transient protection diodes which switch on if voltage exceeds a given level, which are often used in conjunction with a polyfuse. The diodes ...
- 1,645
4
votes
Accepted
Can the Arduino be hurt by connecting too many LEDs in serial?
The forward voltage of an LED or diode is the applied voltage of the "knee" in the exponential characteristic at which it starts to substantially conduct, and in the case of an LED, produce light.
...
- 5,390
4
votes
Accepted
Arduino Pro Mini maximal and recommended current per pin
It is the amount of current the pin can source or sink when in OUTPUT mode.
That is, the amount of current that can flow from the pin to ground, or can flow from VCC into the pin.
You can understand ...
- 105k
4
votes
Accepted
What's wrong with the ACS712 sensor?
Your problem is that you are trying to measure motes of dust with a yard stick. The yard stick is great at measuring things in inches and feet, but when you want to find the size of something that's ...
- 105k
3
votes
Accepted
ArduinoMEGA: 64 digital inputs cause random digitalRead values
After seeing your schematic, I think the general problem here is that you need to more closely read and follow the datasheet for this part. A lot of times, when you are hobbling a project together at ...
- 1,099
3
votes
The importance of I/O pin DC current
I bought a Pi a while back, and found it so tedious to use I put it in my parts drawer and haven't used it since. A Pi is like a small Unix PC - you have to install an operating system, boot it up (...
- 37.6k
3
votes
The importance of I/O pin DC current
Bottom line is: the controllers are just not meant for supplying power.
They do have the ability to do so, within limits - fairly stringent limits for a controller chip itself, and slightly more ...
- 15k
3
votes
Accepted
The importance of I/O pin DC current
The simple answer is: It doesn't matter.
Both Arduino and the Raspberry Pi, and every other common microcontroller board, are designed to control things, not provide power to things.
Digital IO pins ...
- 105k
3
votes
Accepted
"tamper" circuit of a reed switch: can I connect the two wires to an INPUT and an OUTPUT pin?
So I would like to have the current flowing ONLY during the "checking-timeframe".
Turn off the pull-up until just before checking. Allow a few milliseconds for the pull-up to raise the voltage.
...
- 37.6k
Only top scored, non community-wiki answers of a minimum length are eligible