Smartwatch Journey – Part #10


The Smartwatch had lasted just for 3 days until something magical has happened. Fortunately, the battery realised that it has capacity of 100mAh and I am draining around 200uA so  it should last longer. I know that it doesn’t have capacity exact capacity as listed. I got 380 hours (~16 days) of use. That was surprise for me. I knew that LiPo batteries has to be discharged to the 0 and charged over few times, but that didn’t helped me.

  1. Notifications ✓*
  2. Custom header ✓
  3. Cheatsheet ✓
  4. 2 weeks of use ✓
  5. Better Android App ☐

* The app has some bugs, I know about them so I have to find time to fix that.

Smartwatch journey – Part 1


Smartwatch is kind of nice accessory for you and your phone. You can see time, notifications without touching your phone. I wish I could have a smartwatch with long lasting battery and I could show the content I like. The very good one (I don’t mean Apple Watch) are expensive. So I decided to build my own smartwatch 9 month ago. It was a challange for me and my friend, who will build a better one. The research I did took some time.

I would like to have:

  1. Bluetooth
  2. Low power consumption
  3. Display
  4. Button
  5. Optional: Accurate heart rate sensor.

So I need these things:

  1. Microcontroller with Bluetooth Low Energy
  2. Low power display
  3. LiPo battery with TP4056 charger
  4. 3D printer case
  5. Reliable heart rate sensor