Goal : having a Raspberry Pi configured to get temperature from a sensor, save it on a database and push it to a webservice.

• Install Raspbian using NOOBS
  https://www.raspberrypi.org/help/noobs-setup/
• After install, when on desktop, use "Raspberry Pi Configuration" utility to change boot, auto login, localisation, etc.
• Clone this Github project (base for further actions and commands)
• Optional : configure static IP address on eth0 interface
  Attention : see file /etc/network/interfaces -> /etc/dhcpcd.conf
  http://www.modmypi.com/blog/tutorial-how-to-give-your-raspberry-pi-a-static-ip-address

Required material is : sensor DS18B20+, resistance of 4.7k ohm / 0.25W and some cables.

• Connect the sensor to the RPi
  http://www.manuel-esteban.com/raspi-capteur-de-temperature-ds18b20/
• Execute :
  sudo modprobe w1-gpio
sudo modprobe w1-therm
• If no devices in ls /sys/bus/w1/devices :
  http://raspberrypi.stackexchange.com/questions/26623/ds18b20-not-listed-in-sys-bus-w1-devices
  (perhaps execute the two modprobe commands one more time)
• Temperature can be found in file /sys/bus/w1/devices/<sensor_id>/w1_slave
• For further information about how GPIO is working :
  http://www.framboise314.fr/mesure-de-temperature-1-wire-ds18b20-avec-le-raspberry-pi/

• Install sqlite3 using apt-get install sqlite3
• Create database in project root : sqlite3 pi-temp.db
• In sqlite, import table measure : .read measure.sql
• Exit sqlite using .exit
• Useful :
  Several sqlite manipulations (dump, using with Python, etc.) : https://doc.ubuntu-fr.org/sqlite
  SQLite Documentation : http://www.sqlite.org/docs.html

Supported version is 2.7.9

• The three scripts to be executed are :
  ping.py
measure.py
push.py
• Add a cron job for each executable scripts to be executed at reboot
  https://www.raspberrypi.org/documentation/linux/usage/cron.md
  Example : @reboot python /home/pi/pi-temp/ping.py &
  Attention : change PATH in cron tab file : PATH=/usr/bin:/bin:/sbin
  In case of issues :
  http://askubuntu.com/questions/23009/reasons-why-crontab-does-not-work
• Customize configuration in conf.py (most important : sensor id)