Interfacing Arduino Nano and Sim800L with one step down LM2596

Using Arduino General Electronics
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Hello, I'm a programmer but I'm new to electronics.

My project works fine but I need your advice on how to use only one step down to power both, the arduino nano (5v) and the SIM800L (4v) and also I need to know if my connections (resistors, etc.) are acceptable.

Here's a video of my question: Question Video

And here are the schematics of my project:

sch
sch1134×1995 262 KB

My project needs to work with 12V, since it will be connected to a house alarm battery.

Thank You!

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The odds are high the Nano will work with 4 volts eliminating the second buck converter. Be sure to test it thoroughly. Be absolutely sure your grounds are good before powering anything. Check this link to find out why: https://lastminuteengineers.com/sim800l-gsm-module-arduino-tutorial/ The SIM800L requires ~2 amps during transmit.

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