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4 votes

Arduino UNO Power interruption

Do you have to upload the UNO after the applied power is disconnected? No. Does the UNO retain the code without any power? Yes. And when the power is disconnected, if the code is retained, will ...
VE7JRO's user avatar
  • 2,559
3 votes

Nema 17 stepper motor speed problem

Stepper motors need to be gradually brought up to speed. If you try to go from zero rpm to anything over a few hundred rpm they will often just sit there and hum. Try AccelStepper (https://www.arduino....
Brian Robertson's user avatar
2 votes

Arduino | external power supply and USB at the same time

Assuming your question is more along the lines of "How to prevent back driving a USB connected RPi through an externally powered Arduino". Consider cutting the positive power wire in the USB ...
st2000's user avatar
  • 7,315
2 votes
Accepted

AA alkaline batteries on firebeetle?

The following is based purely on the small amount of information in your question. You haven't described your code or your setup, which would allow this answer to be more specific. According to the ...
StarCat's user avatar
  • 1,607
2 votes

How to produce multiple DC voltages for a single project with different dc requirements

If it wasn't for the LED panel then I'd say use a mains to 12V DC power supply. You can then get small off the shelf switching regulator modules that with the addition of a couple of capacitors will ...
Andrew's user avatar
  • 1,050
2 votes

ATtiny25 - assembly - BOD disable for sleep mode - error

The Microchip Studio uses the GNU toolchain or the XC8 toolchain. Unfortunately you did not tell us, which you use for your project. The common solution is to include the corresponding header file to ...
the busybee's user avatar
  • 1,991
1 vote

NodeMCU V3 GOT OVERHEATED AND DIED

Based on https://lastminuteengineers.com/l298n-dc-stepper-driver-arduino-tutorial/, you have wired your servo incorrectly. The third pin on the bottom blue connector (VSS) is the second input, not the ...
Draco-S's user avatar
  • 111
1 vote

Arduino UNO Power interruption

This answer simply add some detail to that provided by VE7JRO to make it more generally applicable but this does look rather like a school assignment. Program code is stored in flash memory and this ...
6v6gt's user avatar
  • 1,028
1 vote

Run Arduino Uno with battery AND use 5V output

You could certainly use a 9V battery into the VIN port on your Arduino, but the built-in power supply uses a "linear voltage regulator", which is quite inefficient. If your goal is long ...
Duncan C's user avatar
  • 5,682
1 vote
Accepted

Run Arduino Uno with battery AND use 5V output

It is almost always better to add a schematic to your question. Backwards engineering from a picture can be confusing at times and lead to incorrect assumptions. What you want to do appears to be ...
st2000's user avatar
  • 7,315
1 vote

Run Arduino Uno with battery AND use 5V output

Yes, that should work, albeit inefficiently: for every milliwatt of power consumed by an LED, you will have roughly 0.7 mW dissipated in the series resistor, and 1.3 mW dissipated in the Arduino's ...
Edgar Bonet's user avatar
  • 42.8k
1 vote
Accepted

How much maximum current do the Arduino Wemos D1 (R1 & R2) consume?

It is possible to measure how much it is using from any of the pins? Put an ammeter (multimeter in current mode) in series with the power supply and measure it, when configured in the way you intend ...
Nick Gammon's user avatar
  • 38.1k
1 vote

Powering a NodeMCU as well as a GSM module

After a bit of researching, I have found the following solution:- A DC-DC buck converter (such as the LM2596) can convert a 12 V 2A rated power supply down to 4 V (the value is adjustable) which can ...
vasantha raj's user avatar
1 vote

Program work when used Delay() but same program doesn't work with millis()

I am not sure I quite understand what the requirements are for this program. However, they do not do the same thing. I tried to represent their behavior as state diagrams, and here is what I got: ...
Edgar Bonet's user avatar
  • 42.8k
1 vote

The Arduino UNO Pin 3V3 have OUTPUT 5V (measured with meter)

I guess either the regulator has failed creating a short or the 5v rail is shorted to the 3v3 rail elsewhere. Removing the regulator and checking the 3v3 rail is no longer 5v should tell you. The only ...
RedGrittyBrick's user avatar

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