to make this prototype i decided to use the following components :

* arduino nano

* OLED display supplier

* HC-05 bluetooth module

then i started reading about the OLED display because i didn't use it before

after alot of reading, the first step was testing the OLED display :

i followed this tutorial to wire the OLED

According to the arduino library for the OLED i used u8glib

then i started testing bitmap, in order to get the C-hex bitmap i used this online converter PicturetoC_Hex_converter

now, let's play with the OLED display! :D

here is the arduino code i used to test the OLED finalface.ino

now it is time to wire the arduino, OLED display and bluetooth

i edited retro watch code, the final code available here

let's finalize the design, you can check it here in the final design page