Past rain data of the climbing areas in Dairy Farm Nature Park (Singapore) is displayed so that climbers won't make wasted trips in the case of extremely wet rock. Nonetheless, this is not a definitive measure and can only serve as a heuristic.

## run this on raspi zero w
1) ssh into pi (use Fing to find raspi ip addr)
- user: pi
- password: raspberry
2) install nodejs
https://warlord0blog.wordpress.com/2018/06/27/node-js-v8-on-raspberry-pi-zero/
https://nodejs.org/dist/v10.16.0/
3) install python3 modules
~/ $ sudo apt-get install libgeos++ 
- shapely requires geos
~/log_rain/ $ pip install -r requirements.txt
- python-telegram-bot==12.0.0b1 requires evdev
4) clone repos
- https://github.com/cheeaun/rain-geojson-sg
- https://github.com/GitMeGet/log_rain
5) run geojson node server
~/rain-geojson-sg/ $ npm i
~/rain-geojson-sg/ $ npm run dev
6) run logging service (spin up another terminal using tmux)
~/log_rain/ $ python log_rain.py
7) run telegram bot
~/log_rain/ $ python telegram_bot.py

## tmux guide (need to spin up 3 terminals to run)
https://www.hamvocke.com/blog/a-quick-and-easy-guide-to-tmux/
- split left, right: Ctrl + b, then %
- split top, btm: Ctrl + b, then "
- nav: Ctrl + b, then arrow key
- close: exit / Ctrl + d
- detach/attach
https://askubuntu.com/questions/8653/how-to-keep-processes-running-after-ending-ssh-session

## misc
- time series database
https://medium.com/schkn/4-best-time-series-databases-to-watch-in-2019-ef1e89a72377
- lightweight database
https://randomnerdtutorials.com/sqlite-database-on-a-raspberry-pi/
https://mariadb.org/