Hi, I'm a highschooler. I want to start a new project which create a smart band for ADHD children. I would like to know what I need to build a whole smart band by myself.
If my topic is in the wrong category, please tell me! Thank you for reading my topic.
Try to clarify your question.
Do you going to use an arduino board in your project?
explain what is a smart band for you.
technically, its a smart device that has an operating system. It also has some programs depends on the use of the band.
My teacher told me to use raspberry pi board to install OS on it. I think it uses arduino ide
that's not a very helpful description..
what are the programs, what's the expected usage? Should it be very capable like an Apple Watch with lots of sensors, 4G, GPS, etc or more limited like counting steps and displaying the time? how big should it be? how will it be powered? ...
Like a smart watch? I'll warn you that it's VERY hard to miniaturize homemade or DIY electronics. 
The Raspberry Pi is unrelated to the Arduino. Except there is something called the Raspberry Pi Pico which is apparently compatible with the Arduino... I don't know anything about it.
The Arduino is a microcontroller. Typically, a microcontroller is use for a single purpose, special purpose, in an embedded system. Modern cars have many microcontrollers. You could build a car alarm with the Arduino.
Since a microcontroller is normally used for a specific purpose, there is usually no operating system and usually no keyboard or hard drive, etc. And without an operating system there is no standard way of connecting these peripherals, and there are no drivers.
Most microcontrollers are simply chips and you have to make your own board and it's usually very complex. The Arduino is a microcontroller chip on a board with bootloader and IDE and which makes it's very easy to use.
The Raspberry Pi is a single-board computer. It usually has an operating system so you load more than one program, and you can plug-in a USB hard drive, keyboard, mouse, a computer monitor (display), etc.
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look at lilygo wearables
at least you would not have to worry about the design, the battery etc and you can focus on the coding
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