PI-WEATHER

A simplistic indoor climate logger application for the Raspberry Pi.

Wiring

This is the pinout of a Raspberry Pi 1 Model B:

DS1820

Add a 4.7k resistor between 3,3V and BCM4.

Setting up Raspbian live system

After installing a recent version of Raspbian on the Pi, take the following steps:

1. Activate I2C via raspi-config

2. Install required dependencies:

   sudo apt-get install python3 python3-pigpio python3-pip python3-flask
   sudo pigpiod

3. Start the pigpio deamon

   sudo pigpiod

4. Set up a cron job. As your user (we are assuming pi here), run

   crontab -e

   and append the following line

   * * * * * cd /home/pi/repositories/pi-weather/ && ./piweather-logger.py

   . This should run the logger every minute.

5. Start pigpiod and piweather-server at startup. Lazy people can do this also using cron:

   sudo crontab -e

   Insert these lines:

   @reboot /usr/bin/pigpiod
   @reboot cd /home/pi/repositories/pi-weather && ./piweather-server.py

6. For enabling 1-Wire communication with DS1820 sensors, append the following lines to /boot/config.txt:

   # DS1820
   dtoverlay=w1-gpio, gpiopin=4

After rebooting, you should be able to read the sensors via sysfs.

6. Reboot

Using Arch for development

For those who prefer Arch Linux, a development environment can be set up as follows:

sudo yaourt -Suy python3 pip3
sudo pip3 install flask