@Shamonto Hasan Easha, but you've done this project before! you had spmething clear in mind about what you gonna do with your project at the begning of this post, & it was a year ago :/

 

Well, thank you so much ... my problem now is that i've reached a dead end, i need an android app for my ssmartphone so i can read through an OTG cable linked to an arduino ... & i'm not an android expert nor java! i'm just stuck now

 

There is a new question moved to -- I have an idea to convert ethernet to TTL, but I don't know how it's it.