aljamima / rpi-airtemp

Monitoring air temperature via web interface using Raspberry Pi; data logging and plotting using RRDtool.

rpi-temperature

About

This repository contains the scripts required to:

• Measure air temperature using a Raspberry Pi
• Store the measurements taken in a Round-Robin Database
• Create a graphical representation of the data stored
• Create an ultra simple webpage to display the graphs

Specifications

Raspberry Pi model: B+
Sensor model: DS18B20 (waterproof)
Kernel release: 4.1.19+ (Raspbian)
RRDtool version: 1.4.7
The graphs will be of PNG file format

Installation

Install RRDtool and a web server (i.e. Apache):

apt-get install rrdtool apache2

Download and save temp-sensor.sh and temp-graph.sh in /root/bin/ for example.

Edit the following line found in function read_raw_data (temp-sensor.sh)

RAW_DATA=$(cat /sys/bus/w1/devices/28-04146dd116ff/w1_slave)

replacing 28-04146dd116ff with the number corresponding to your device. Then add the two shell scripts as cron jobs by executing:

crontab -e

and adding the following two lines:

@reboot /root/bin/temp-sensor.sh
* * * * * /root/bin/temp-graph.sh > /dev/null 2>&1

Save and exit!

Images

Webpage

Sample graph (2 Hour Temperature Log)

Sample graph (4 Hour Temperature Log)

Sample graph (12 Hour Temperature Log)

Licence

GNU GENERAL PUBLIC LICENSE // Version 3, June 2007

Developer

George Z. Zachos

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