Firstly, I will introduce myself. I’m a french student and I have to do a project for my school…
I explain to you my project :
I want to create a connected pen. The pen will send information to a smartphone via Bluetooth when I push (or turn) a button.
For example : I turn the button to the red color, I push it and the smartphone receive the information.
So I need a microcontroller with bluetooth chip and battery :
I decided to use “Light bean” product.
What is the "Light bean" product? Post a link to its datasheet.
I don't understand the role of a "pen" nor what you mean by a "connected pen". By the way I am assuming a "pen" is a thing you write with.
It is certainly possible to make an Arduino project that sends different messages via Bluetooth when different buttons are pressed. But an Arduino is not a pen.
The Bean looks like an interesting device, but this is the first I have heard of it. I can't quickly see if it can be programmed using code that would work on an Arduino Uno.
I know how to get an Arduino Uno to do what you want.
You have not answered my questions about your use of the word "pen".