OLED Watch Is Alive!




So it’s been a while since I last posted about my OLED watch, and I’ve done a lot of work on it! (And also broke it multiple times)

It’s taken me a lot of work to get this far, and I developed EVERYTHING from the ground up. The electronics design, the PCB layout, the RTOS and firmware drivers, the graphics engine, the user-mode app code, and even USB communications apps. I’ve used C, C#, and Python extensively in this project, and Altium Designer for the schematic and PCB.

Overall it has been an awesome learning experience, and if I was to make another one I would do a lot of things differently!

Here’s a few features of my firmware:

OLED Watch Is Alive

  • USB HID Communication (No PC drivers required!)
  • Watch face for telling the time (Kind of required…)
  • Date & Upcoming events
  • Accelerometer reading
  • RTOS Kernel debug info

And some features planned for the future:

  • Bluetooth 4.0 (Still need to get the IC for it though)
  • Magnetometer readings
  • Smart alarm clock that wakes me up at the ideal time, by detecting my sleeping patterns through the accelerometer
  • Auto screen on by rotating or shaking my wrist

SMD Rework

If you’ve read my last blog post, you’ll know that I ripped the USB traces off my last PCB! I ended up using my hot-air reflow station to transfer the components to a spare PCB, and luckily it all powered up and worked after that! Here are some photos of my reflow process:

Notice how I soldered the OLED directly to the PCB, I had used a connector in my last board but it added extra distance to the OLED cable, so it wouldn’t fit into the case. Soldering directly to the PCB gave me a few more millimeters to work with!

 

For more detail: OLED Watch Is Alive!




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