Two Arduinos NANO dead

Hello,

I have a project of Autofocuser for astronomy telescope using a stepper motor and a driver and I happend to kill two arduinos on it. I don´t really know where do I make mistake so maybe you can help me.
I send you a diagram of the wireing and some photos for the idea of how it looks.
Also I measured resistance of 0.4 ohms betwean VIN and GND. Is it normal?
See the photos on this google drive storage: Pictures
I want to use 12V adapter for powering the arduino and the stepper motor at the same time. The arduine get very hot when I plug in the 12V adapter and dies. Before, when I try to program it using the USB cable, it worked.
Any help would be apreceated.
Thanks.
Sincerely,
Milan

5 V adapter is the choice. 12 V, seems too much.

1 Like

Schematics my friend.

Don't do measurement like that. There's all kinds loads, different circuits, semiconductors..... It just doesn't work.

That can be done using a proper design.
Schematics are needed.

The (classic) Nano design should have had a diode inline with V-in, like the Uno DC socket has.
Not having one could back-power the 5volt regulator if you remove 12volt while programming.
Back-powering will kill the regulator, and then kill the rest of the Arduino.

Drawing any current from the Nano when powered with 12volt could also kill the regulator.

I see you have a removable connector for the motor.
Pluggin/unplugging that while the driver is powered will kill the driver.
Leo..

You may be getting away with the soldering you are doing, but it looks like crap. Technical term there.

Nothing I would fly to the Moon as we say around here.

Get some wire and solder and a piece of veroboard and some components you have plenty of, dial up and watch a few "how to solder" videos and practice practice practice until you can make reliable good looking solder connections.

There are no pictures of my first projects, but my Mom did once tell me she saw the things I made get better and better looking - I saw more of the things I made actually work. :expressionless:

a7

Tech term is "feces". :grimacing:

12V on those 3 for $5 clones is a killer without anything else connected.

I will try my best but not how to do propper schematics. The picture I provided is not enought?

This is a propable cause. What do you suggest I use for power both the arduino and also the driver with same 12V adapter?

I tryed this with the breadboard and it worked OK. I didn´t kill the driver. This is propably not the cause.

Thaks for the imputs.

I have seen all the videos about this on the internet :smiley:
I know my soldering is very amateur, I will try my best on my 3rd attempt.
Thanks for the feedback.

You think? I have tryed it on the solderless breadboard and it worked. But I will give this idea a try and next time I use the original nano.
Thanks for feedback.

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