This is a smartwatch I made using the Adafruit Pro Trinket, and some other parts.

If you have any questions, let me know, otherwise lets get started!

Step 1: Materials

The materials needed for this are:

Adafruit Pro Trinket 3.3V: Pro Trinket,

Adafruit DS3231 Precision RTC Breakout: RTC module,

Adafruit LiIon/LiPoly Backpack Add-On for Pro Trinket/ItsyBitsy: Battery Backpack,

Lithium Ion Polymer Battery - 3.7v 500mAh: Battery,

Three Small pushbuttons (I don't know where you might get these, I found mine lying around, waiting to be used)

OLED screen: Screen

Step 2: Testing

This step is just putting all of the parts on a breadboard and making sure they all work correctly, I have a schematic of how they are wired in the pictures above. Once you have everything wired you can upload the code!

After you have the code, you will need to open Arduino IDE, if you don't have the Pro Trinket boards manager yet, you can go to tools/boards/boards manager and search Adafruit and it should com up with a result that has the pro trinket in it. You will also need to select the USBTinyISP programmer from tools/programmer.

Open the smartwatch code and upload it using CTRL+SHIFT+U, not CTRL+U because it (CTRL+U) won't work.

If you have wired everything correctly and the uploading didn't have any errors, you should get results on the oled screen that has the time (The code is still being worked on, setting the time and stopwatch don't work like they should.)

Here is the code:

Smartwatch.ino
Download

Step 3: Finishing Up!

Now that everything works, take a break! If you have already done that, then follow the instructions (Because that's what Instructables is all about, right?) on where the wires are soldered to.

PLEASE EXERCISE CAUTION! THE SOLDERING IRON IS VERY HOT AND COULD BURN YOU AND IN SUCH A TIGHT SPACE THE CHANCES OF BEING BURNT CAN BE HIGHER.

But don't feel like you don't have it all figured out if you do actually get burned, I got burned multiple times.

RTC:

SDA to pro trinket A4 pin

SCL to pro trinket A5 pin

Vin to battery backpack 5V pin

SQW to battery backpack BAT pin

GND to battery backpack GND pin

OLED Screen:

DATA to Pro Trinket pin 9

Clk to Pro Trinket pin 10

DC to Pro Trinket pin 11

Reset to Pro Trinket pin 13

CS to Pro Trinket pin 12

Vin to Pro Trinket 3V pin

GND to Pro Trinket GND pin

Battery backpack:

BAT to Pro Trinket BAT+ pin

G to Pro Trinket G pin

5V to Pro Trinket BUS pin

And that's all the connections, you can use that or the schematic if you want. Have fun soldering!

Step 4: You're Done!

Congratulations! you have a new smartwatch! If it doesn't work correctly the first time, just check, and double check all of your connections and try again. Mine didn't work correctly the first couple tries but I found out what was wrong (just some loose connections) fixed it, and it worked!

I am hoping to make a case in a later project.

Please ask any questions you need.

And don't forget to vote (If you liked it) for this in the clocks contest!