Homemade ring watch on ATtiny85

Chinese maker Chen Liang (陳亮) has published step-by-step instructions on how to assemble cute ring watches on the ATtiny85 microcontroller.

Compared to the previous ATtiny Watch Core project , the author decided that the system will work at an electric voltage of 2.0 V, so the small ATTINY85V-10SU microcontroller will come down. To him - the tiny debug board Digispark.

The CR1220 batteries should last for six months.

For the display, the author took the OLED display SSD1306, the smallest such screen has a resolution of 64x32 pixels.

The case is easiest to print on a 3D printer, and cover the display with a transparent piece of plastic.

For assembly, you will need three more M2 screws, three buttons, two resistors (more than 1k), copper wires with insulation, a thin plate, an adapter board from SOP8 to DIP8, and a small piece of the multipurpose PC board.



The author describes in detail the installation and configuration of Arduino , provides links to the sources of all the software necessary for the watch to work, he also uploaded files for 3D-printing the watch case.



Further, see instructions for soldering contacts .







Connect buttons and display .





In the end, you need to make fasteners for the battery and program the microcontroller by connecting the board to the computer, configure the display andset the time .



It's almost done! After installing the case, you can brag to your friends with a cool watch, which no one else has.