berkaycubuk/pure-watch

Pure Watch first prototype source code

Pure Watch

Pure Watch is an open-source and open-hardware "smart" watch.

Hardware

• Raspberry Pi Pico W
• MPU6050 Gyro Sensor
• SSD1306 128x32 Oled Display
• MAX30102 Heartbeat Sensor
• 3.7V 250mAh Li-Po Battery
• TP4056 Type-C Charger
• 3 Slider Switches

Hardware Diagram

Here is a super simple diagram to explain connections:

Plan

• Time sync with local file, wifi and cable connection
• Close display if there is no movement
• Show display if there is movement
• Read heartbeat and display it
•  Bluetooth
• "T-Rex Chrome Dino Game" like game using gyro (can be fun)
• Sleep improvements for battery life
•  Convert to C instead of micropython?
• Super simple mobile app to configure ssid, password and etc.. via bluetooth

pure-watch's Issues

Battery level calculation is not correct

Battery level calculation working principle:

• The power is coming from the battery charger module to VSYS and GND pins
• Pico uses ADC on VSYS pin to measure coming voltage
• Calculates battery percentage by using minimum voltage, maximum voltage and current voltage

I charged my battery fully and charger module blinked full led. But watch says 53% and even if the battery is not in great condition the number did not seem right. I'm super new at battery stuff so your help will be welcomed :^)