Hello guys i have some questions. First i am designing a commercial product and i am using arduino in it. Is it legal to use arduino inside of commercial product or do i need to get some permission e.t.c. ? And if i can use it, How can i print arduino to PCB. Are there some prepared drawings.
Also same questions for ESP8266.
You can use these in a product but if you are planning to market to the pubic, you may have to look at getting safety and electrical certifications.
These are not designed for medical applications.
Sounds like you are inexperienced in PCB design, maybe ask in 'Gigs and Collaborations' for someone to do this for you.
Search this site for past discussions.
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you could start here , there are some answers
and amongst them .....
.....
Yes, with the following conditions:
Physically embedding an Arduino board inside a commercial product does not require you to disclose or open-source any information about its design.
Deriving the design of a commercial product from the Eagle files for an Arduino board requires you to release the modified files under the same Creative Commons Attribution Share-Alike license. You may manufacture and sell the resulting product.
.......
but please read the page thoroughly 
You can download the Eagle files and any board fabrication house can make boards from those. The documentation for the Aduino Uno is [u]here[/u]. The designs are "open source".
There's not much "special" about the Arduino circuit and you could easily design your own ATmega circuit to meet your own particular needs. The things that makes the Arduino design special are the bootloader and the IDE. In a production item, you probably don't need the bootloader since there are other ways to program a chip and the cost of the programmer is not significant when you get into quantity, and with a separate programmer you can leave out the USB port if you don't need it for anything else.
Also same questions for ESP8266
As far as I know that's not an open source Arduino product. But, you can go to the chip manufacturer's datasheets to find the recommended design schematics and layout your own board from that. The chip manufacturer wants you to copy the schematic, but most board manufacturers don't want you to steal their PCB artwork.
You might want to do a careful cost analysis before you start "manufacturing" because for small quantities it's going to be cheaper to buy pre-manufactured, assembled, and tested boards. I'd guess your break-even point will be somewhere over 100 boards, and quite a bit higher if your labor isn't "free".
Also same questions for ESP8266.
That is an intentional emitter and while the raw module has been type approved once you incorporate it into something else then that something else needs certification. In the US it will be FCC an in Europe it will be CE.
It will cost you upwards of $2000 to get all the test house reports and file the paper work.
I have looked up the ESP8266 models and there are 2 types of esp8266 which is approved by wi-fi institute and we are using one of them. Also do i need that certificate for 433 mhz rf modules
Yes
caneradiyaman6:
I have looked up the ESP8266 models and there are 2 types of esp8266 which is approved by wi-fi institute and we are using one of them. Also do i need that certificate for 433 mhz rf modules
The module might be approved but when you incorporate one in a product it does not mean that the product is approved. The product as a whole needs retesting.
There was a case a few years ago when the FCC fined a company many thousand of $ because they changed the colour of an LED on a product and didn't have it retested.
wow 
i did not know them guys thank you so much for informations
LarryD:
You can use these in a product but if you are planning to market to the pubic, you may have to look at getting safety and electrical certifications.
Yes, safety is very important in that area.