Digit

Introduction

This is a multiroom Digital Thermostat for the Raspberry Pi. It can be used in combination with a heating system that can be controlled using electronic valves. features:

• read data from 'unlimited' sensors DS18D20, DHT11, DHT22, AM2304 (the limit are the number of GPIO pins). the DHT sensors require adafruit 'dhtreader.so'

• Round Robin Database for logging data

• dynamic web/touch interface with highcharts graph

• connection to relay made with a shift register for future expandability https://github.com/jtonk/Digit/blob/master/breadboard_fritzing.png

• reading and logging of temperatures every 10 min

At this moment the logging and measuring runs quite stable, there are some issues with the httpserver (it drops out, but I don't know wy)

installation

git clone https://github.com/jtonk/Digit

sudo apt-get install python-daemon python-pip python-rpi.gpio python-requests python-bs4 python-rrdtool

sudo pip install apscheduler

if you use one-wire sensors also load the kernel modules

sudo modprobe w1-gpio
sudo modprobe w1-therm

sudo echo "w1-gpio" >> /etc/modules
sudo echo "w1-therm" >> /etc/modules

ls /sys/bus/w1/devices/

check if this list has some devices. copy these ID to your settings.ini

config

setup the settings.ini file

[sensor1]
name = 'kitchen'
sensorid = 28-0000058877bc
sensortype = 1-wire
dist = dist1
valves = 4,5
temp_set = 20.0
hum_set = NaN
color = #67E8CE

How to use

Since we have to use the GPIO pins we have to run as root. Launch with

sudo ./run-daemon.py start

Stop with

sudo ./run-daemon.py stop

Debugging and logging

In the root folder of Digit do

tail -f digit.log

to see all logging information.

roadmap

• add humidity reading and logging for DHT sensors
• advanced scheduling
• stability improvements on the http-server