user77438: 
I need help to draw a diagram of this picture
the project include an Arduino nano, dht11 sensor, power module IRF520, 12V power supply and a fan

user316: See Rules and guidelines for drawing good schematics on electronics.stackexchange.com.
I'm no expert but perhaps some of what I have found will be of help.
To produce a clear easy-to-read useful schematic it doesn't really matter what tools you use. This website has a reasonable schematic editor so I suggest you could try that to start with.
Other tools I have tried include KiCAD, EasyEDA and Fritzing. KiCAD is maybe a bit hard to start with and Fritzing I find is very troublesome - It's good for the kind of breadboard layout diagram it was originally designed for. I have really enjoyed using EasyEDA. Other notable tools include Eagle. All these are free or have free versions for hobbyists. Beyond that are more capable and sophisticated professional tools.
Drawing a good schematic is an art and taking care of small details makes a big difference to how useful the diagram is.
The main features that I find make schematics for me to read are

Ground connections at bottom edge of diagram.
Positive voltage connections at top edge of diagram.
Left to right flow for signals and power (e.g. battery at left, microprocessor in middle, LEDs, motors etc at right)
Avoid having wires cross. Adjust the pin positions on an IC symbol to make this possible.
Label everything clearly but don't let text overlap with anything else.


simulate this circuit – Schematic created using CircuitLab
The way you appear to be powering these modules seems a bit eccentric but this would be how I might draw that as a block-level schematic.

77438: <p><a href="https://i.stack.imgur.com/ohTYt.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ohTYt.png" alt="How can i draw a diagram out of this?" /></a></p>
<p>I need help to draw a diagram of this picture
the project include an Arduino nano, dht11 sensor, power module IRF520, 12V power supply and a fan</p>
 316: <p>See <a href="https://electronics.stackexchange.com/q/28251/2191">Rules and guidelines for drawing good schematics</a> on electronics.stackexchange.com.</p>
<p>I'm no expert but perhaps some of what I have found will be of help.</p>
<p>To produce a clear easy-to-read useful schematic it doesn't really matter what tools you use. This website has a reasonable schematic editor so I suggest you could try that to start with.</p>
<p>Other tools I have tried include KiCAD, EasyEDA and Fritzing. KiCAD is maybe a bit hard to start with and Fritzing I find is very troublesome - It's good for the kind of breadboard layout diagram it was originally designed for. I have really enjoyed using EasyEDA. Other notable tools include Eagle. All these are free or have free versions for hobbyists. Beyond that are more capable and sophisticated professional tools.</p>
<p>Drawing a good schematic is an art and taking care of small details makes a big difference to how useful the diagram is.</p>
<p>The main features that I find make schematics for me to read are</p>
<ul>
<li>Ground connections at bottom edge of diagram.</li>
<li>Positive voltage connections at top edge of diagram.</li>
<li>Left to right flow for signals and power (e.g. battery at left, microprocessor in middle, LEDs, motors etc at right)</li>
<li>Avoid having wires cross. Adjust the pin positions on an IC symbol to make this possible.</li>
<li>Label everything clearly but don't let text overlap with anything else.</li>
</ul>

<p><img src="https://i.stack.imgur.com/0RdSj.png" alt="schematic" /></p>

<p><sup><a href="/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2f0RdSj.png">simulate this circuit</a> &ndash; Schematic created using <a href="https://www.circuitlab.com/" rel="nofollow">CircuitLab</a></sup></p>
<p>The way you appear to be powering these modules seems a bit eccentric but this would be how I might draw that as a block-level schematic.</p>
