Hi All I am switching from Arduino nano to pro mini need help with schematics for pro mini similar to the one I have uploaded which is for nano. Any help is much appreciated thx 
That’s not really a schematic and you ought to really move away from those sort of drawings for your projects IMO.
Some of the free PCB generation packages can make “ proper” looking schematics .
Assuming your Pro Mini is 5V 16Mhz, Vin on the Nano is RAW on the Pro Mini. And 5V on the Nano is Vcc on the Pro Mini. D3 and D4 are the same on both.
Why do you think the wiring of the Pro Mini would be any different? It has a Pin3 and a Pin 4. It has GND, RAW/VIN, and VCC/5V. Those are the only five pins you use.
What help is needed? The switch between the two is rather trivial - just make sure you have an FTDI cable at hand. No built-in USB adapter or ISP header on the Pro Mini.
Unreadable as a 'schematic'
But it is unwise to feed 12 V to "Vin" or "Raw" on a Nano or Pro Mini.
You really want to get a simple switchmode "buck" converter module to provide a proper and reliable 5 V to the "5V" pin as well as whatever other 5 V devices you intend to use. I very much doubt that the stepper motor and driver is the only thing you intend to connect as it can only perform a single repetitive task without any inputs.
Hi,
Welcome to the forum.
Please read http://forum.arduino.cc/index.php/topic,148850.0.html.
Then look down to item #7 about how to post your code.
It will be formatted in a scrolling window that makes it easier to read.
Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?
Can you please tell us your electronics, programming, arduino, hardware experience?
Thanks.. Tom...
Hi All, Apologies if I haven't uploaded the schematic image correctly, the one I have uploaded is a pic taken from Tv. I am total newbie to electronic world. I am looking to build a device which helps to capture images of stars called barn door tracker.
Hence I need to control the speed of the nema 17 motor with a potentiometer it will be of great help if some one can guide me on this.
The above schematic I found online while trying to get the motor spinning.
kumar4891:
Hi All, Apologies if I haven't uploaded the schematic image correctly, the one I have uploaded is a pic taken from Tv.
You may have misunderstood, what you have uploaded is NOT a schematic / circuit diagram, it is a piece of 'artwork' and is of no use to most of us here.
A schematic / circuit diagram looks like this:
Hey Thx, but m still not understanding the difference coz m a noob. 
please help me with my request with code and connections
To help with connections, you have to draw a schematic.
To help with code, you have to post whatever you have and explain what help you need.
Considering a Nano and Pro Mini are essentially the same, the same code will run on either just fine.
By the way, a Pro Mini is called "pro" for a reason. It's a lovely form factor, but not beginner friendly. Stick with a Nano or Uno, they're simply easier to deal with.
Check out this site for a Barn Door Tracker.
This guy has a lot of details, hardware, software, looks to be pretty well done. Check the tabs across the top.
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