By mattwach | Instructable
This project is an e-Paper clock and weather station that automatically sets itself (via GPS) and can be built to last about 6 months on 4 AAA batteries. It purposefully does not need any network connections for the sake of security and reliability.
- Autoset (via GPS)
- Current temperature.
- Current humidity.
- A pressure graph showing pressure over the last 25 hours.
- Sunrise and sunset times
- Current moon phase
- Select between 12h or 24h modes.
- Select between English and metric units.
I put together two main variants of the project: “easy” and “low power”. The “easy” version is based on the Arduino Nano. The intent with this variation is to minimize cost, part count and build complexity. The downside is that you’ll need to power the clock from a USB 5V adapter.
The “low power” version uses a 32k oscillator to maintain accurate timing with very little power. This oscillator allows the clock to run on batteries.
Both versions are designed to be buildable on a breadboard for experimentation. The final board is designed to be buildable by any of several techniques: prototype boards, CNC milling, chemical etchings, or ordering a PCB from the provided design files.