I would like to inquire about purchasing parts related to power

Other Hardware Motors, Mechanics, Power and CNC
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  1. 5v/390MA
  2. 5v/70mA

I want to connect the above two power-requiring components.

Currently, I have a 12V power supply (12v, 240W) and a 5v Arduino supply line.
Since I plan to use the Arduino as a controller as well, I need one more wire to supply power to the Arduino (the one I currently have is planned to be connected to bbb).
In this case, what is the way to solve the three problems above?
There are many mistakes when buying blindly, so I plan to buy after listening to advice from seniors.
(
First, I'm wondering if it's ok to convert the power to 12v as well.

If not, I wonder if it is possible to use batteries.

I'm also curious if there are any other smart ways.
)

thank you so much for reading

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Welcome! You are on the right track doing the design to what you want, not to use parts you mistakenly bought. Your power supply will be fine and many others wish they had it. I highly recommend you hold off on parts for a short time and read the Arduino cookbook, it will give you a good starting point in the world of Arduino hardware and software.

Look at buck converters, and if you do not have a VOM meter purchase one, they can be gotten in the $5.00 range from china and they are OK for starting. Hint do not do current measurements until you understand the process, many meters are destroyed by doing current connections wrong.

This will get you started, keep asking questions and we will help you through the fun learning process. If you get time watch a few basic electronics tutorials and maybe some of the Arduino as well. Some are not very good but some are excellent.

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I use and recommend this efficient 5V switching converter, which can handle 500 mA total. If you need more current, Pololu carries a 1 Ampere version, as well as a wide range of other, well designed and efficient converters.

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Thanks for the reply. First of all, I think I have a few similar books, so I decided to try the Electronics Cookbook (O'Reilly) and the Arduino Cookbook. I think this will help me.
Luckily I have a vom meter. Not only are I short on time, but we are also short on money, so the only way to play it safe is to wait for the book.

I'm just grateful for the quick, kind, and detailed response.

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xl6009 -> xl4005

Thankfully, the product you mentioned was very efficient and the price was reasonable. However, when I searched for similar products on Ali, I was concerned about the long delivery time.
So, I looked for similar products in my country and came across the xl4005 (to 1.25~36V/5A) product at a low price.
I have a question about this. If I connect it to my own power supply(12V,240W) and use it, will the converter not break down due to overcurrent?

Thanks to the direct selection, I was able to narrow down the many options. thank you so much for your reply

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All circuits draw the current they require under normal operation. The power supply must be capable of providing more than the total required current.

If you don't abuse a converter (for example, disobeying the stated limits and overloading it), it will function as advertised.

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This is 5A and I need at most 1A for both products.
Do I need to connect an additional resistor?

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It is well and good that the power supply can provide more current than the project will draw.

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This question is the same as:

I have a 60W lightbulb (@ 230V) and connect it to the electricity of my house which is fused with 16A; do I need a resistor?

Do you ever use a resistor? I doubt it :wink:

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Wow, Very sharp.
I've never used it.
Can you recommend how to use it?

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I'm very embarrassed, but I want to show this side to you today and show others my perfect side. I would be very grateful if you could let me know.

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