sweaty@home

Goal

Create a connected thermostat able to pilot a boiler (on/off) and electronic heater (Pilot wire)

Hardware

Server

• Raspberry Pi
• 433 Mhz receiver
• LCD Screen 2x20 Characters PC2002LRS-A

Thermal sensor

• Arduino Uno
• Digital Thermometer : DS18B20
• 433 Mhz emetter

Software

Arduino

• OneWire Library
• VirtualWire Library

Rapsberry

• Flask : phyton web framework
• SQLite
• SQLalchemy
• Python
• PiGPIO
• Custom LCD Lib from zem.fr

Requirements

Package	Version
Flask	0.10.1
Jinja2	2.7.3
MarkupSafe	0.23
SQLAlchemy	0.9.8
Werkzeug	0.9.6
argparse	1.2.1
distribute	0.6.24
itsdangerous	0.24
wsgiref	0.1.2

LCD Wiring

Connector
16 - 15 [-------------------------------------------]
14 - 13 [                                           ]
12 - 11 [                                           ]
10 - 9  [                                           ]
 8 - 7  [                                           ]
 6 - 5  [                                           ]
 4 - 3  [                                           ]
 2 - 1  [-------------------------------------------]

PC2002	Signal	Couleur	Rasp
1	VSS	Marron	GND
2	VDD	Rouge	+5V
3	Vo		LCD Contrast
4	RS	Orange	GPIO 7
5	R/!W		GND
6	Enable	Jaune	GPIO 8
7	DB0		-
8	DB1		-
9	DB2		-
10	DB3		-
11	DB4	Vert	GPIO 25
12	DB5	Bleu	GPIO 24
13	DB6	Violet	GPIO 23
14	DB7	Gris	GPIO 18
15	Anode	Blanc	+30mA (3V)
16	Cathode		GND

Functionnality

• Read temperature from remote sensor through RF
• Set hysteresis for Temperature regulation
• Display current temperature on LCD
• Pilot boiler through relay
• Pilot Electric heater through optotriac

Web Interface

• Set Temperature
• Define Schedule
• Graph logged T°

Install

Arduino

Download and upload the Arduino sektch into an Arduino board.

Arduino pin out

10k Pull-up resistor between +5V and Data

DS18B20 (data pin) : pin 2

RF Emetter : pin 12

Raspberry

On top of a vanilla version of Raspbian, install

sudo apt-get update
sudo apt-get install python-sqlalchemy python-flask apache2 libapache2-mod-wsgi git avahi-daemon

Download and Install PiGPIO : http://abyz.co.uk/rpi/pigpio/download.html

wget abyz.co.uk/rpi/pigpio/pigpio.zip
unzip pigpio.zip
cd PIGPIO
make
sudo make install
cd ..

Get sweaty@home and install it:

git clone https://github.com/acolab/sweaty_at_home.git
cd sweaty_at_home
sudo cp init.d/pigpiod /etc/init.d/pigpiod
sudo update-rc.d pigpiod defaults
sudo service pigpiod start
sudo cp apache_config /etc/apache2/sites-available/sweaty_at_home
sudo a2ensite sweaty_at_home
sudo a2dissite default default_ssl
sudo service apache2 reload

Then connect to http://raspberrypi.local/.

If you use the one wire sensor directly connected to the pi, install the daemon:

sudo cp init.d/one_wire_sensor /etc/init.d/
sudo update-rc.d one_wire_sensor defaults
sudo service one_wire_sensor start

Enabling MRF24J40 ZigBee support on the Raspberry Pi

On a Linux system:

Install rpi-build (https://github.com/notro/rpi-build/wiki):

sudo wget https://raw.githubusercontent.com/notro/rpi-build/master/rpi-build -O /usr/bin/rpi-build && sudo chmod +x /usr/bin/rpi-build
rpi-build

Prepare a working directory and configure the kernel:

mkdir rpi_mrf
cd rpi_mrf
rpi-build use[stdlib] rpi_linux menuconfig

Activate these options:

Networking support
  Networking options
    <M> IEEE Std 802.15.4
      <M> 6lowpan support
      <M> Generic IEEE
Device Drivers
  Network device support
    <M> IEE 802.15.4 drivers
      <M> Microchip MRF24J40 tranceiver driver

Build the kernel:

rpi-build use[stdlib] rpi_linux build

Install it on your Raspberry Pi:

rpi-build use[stdlib] rpi_linux install SSHIP=<ip of the raspberry pi>

Reboot the Raspberry and you should be able to load the mrf24j40 module (and add it to /etc/modules).