Your own weatherstation

Create a own weather station or temperature monitoring using a tiny digital temperature sensor.

I use this setup to monitor a server room, and outdoor temperature and as a weather station.

This project consists of interface between RS-232F and the Dallas one Wire system.

You need:
– Some linux skills
– Basic soldering and some electronics skills to find where is plus and minus;)

Components:
1 500mW, 6.2V Zener diode -> D4
1 500mW, 3.9V Zener diode -> D2
2 Schottky diodes or SB130 -> D1 and D3
1 0,25W, 1.5 kOhm resistor -> R1
1 D-sub 9 female connector
1 small piece of perfboard or carton
One or more digital thermometer sensors DS1820 or DS18s20

The complete circuit: – Click to resize

Transistor overview: – Click to resize

The simplest way to control the one wire system is to use Digitemp, I used it on Debian and Ubuntu, installable from repositories:

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apt-get update && apt-get install digitemp

Of course you can get it for Windows too, all version are already compiled download and try it out;)

Command usage:
Initialize the wire:

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digitemp_DS9097 -i -c /etc/digitemp.conf

The configuration will be written to: /etc/digitemp.conf

You should get a output like this one:

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DigiTemp v3.5.0 Copyright 1996-2007 by Brian C. Lane
GNU Public License v2.0 - http://www.digitemp.com
Turning off all DS2409 Couplers
Searching the 1-Wire LAN
107DCD16020800EF : DS1820/DS18S20/DS1920 Temperature Sensor
ROM #0 : 107DCD16020800EF
Wrote /etc/digitemp.conf

Receive data from sensor:

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digitemp_DS9097 -c /etc/digitemp.conf -a
DigiTemp v3.5.0 Copyright 1996-2007 by Brian C. Lane
GNU Public License v2.0 - http://www.digitemp.com
Sensor 0: 23.38

Great it’s: 23.38°

Some photos: – Click to resize

The next step could be a plugin for Nagios or Icinga to monitor the status and receive notifications.

Have you some wishes or questions? let me know:)