If you are looking for a project to keep you busy this weekend you might be interested in a new 3D printed ring watch that has been created and published to the Instructables website and uses a ATtiny85 development board.
The latest ring watch has been based on previous designs such as the ATtiny Watch Core and more and full instructions have been published to the Instructables website for you to create your very own.
The creator of the ATtiny85 Ring Watch ‘mooncl’ explains a little more about its designed the companies you require.
MCU :Today core subject, ATtiny85. Someone suggest me to use SOIC version to reduce the watch size and I found the coin cell mAh calculation method will count the battery voltage down to 2.0 V, so this watch require a low voltage version MCU to keep it stable. So I have ordered an ATTINY85V-10SU. (much expensive $_$)
ISP :Any ISP that can program ATtiny85, this time I am using a Digispark act as a littleWire.
Battery :In order to meet the ring size, I choose CR1220, I expect it can last over half an year.
Display :Since the number of IO pins of ATtiny85 is very limited, I design display and further modules should all run in I2C. Power consumption and source availability are also important factors. I choose an OLED screen drive with SSD1306. It can find in 4 different sizes, 64×32 is the smallest one. (another sizes are 128×64, 128×32 and 64×48)
Watch Body :It should be more stylish if make it by wood, but I am lazy one, so just print it out.
Transparent Cover : A small piece of transparent PET plastic plate. It is transparent, provide enough support and very easy to get from many product packing.
– A SOIC ISP clip for program ATTINY85V-10SU
– 3 pieces of M2 screws
– 3 buttons
– 2 various resistors (more than 1k)
– coated copper wires
– thin mental plate for making a tailor-made battery holder
– a SOP8 to DIP8 board
– a little piece of multipurpose PC board for building button panel
Jump over to the Instructables website via the link below for full instructions.
Source: Adafruit : Instructables
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