My online geiger counter which I described earlier has been offline for some time. During that time I experimented with a standalone Arduino with the goal of making a dedicated board for the setup. I have now completed the board shown in the picture below.

In the picture you can see the HV generator on the top of the board, on the lower left the Arduino standalone parts along with a MAX232 as a level converter for easy serial hookup and on the right two tubes connected in parallel, a SI-29BG (beta and gamma) and a SI-12B for added alpha sensivity. Also shown are the USB>Serial adapter and a separate USB connector to provide 5V to the board. Read more »

This article will try to explain how to monitor and graph temperatures remotely using Dallas Semiconductor DS18xx sensors, SNMP and Cacti. DS18xx sensors are relatively cheap, accurate and multiple sensors can be connected to a single bus.

This guide is based on Ubuntu, so YMMV on other Linux/Unix based systems and may need modification to work properly.

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De meeste spam op mijn weblog komt van grootschalige botnetspammers. Het verbaasde mij dan ook enigszins de volgende Nederlandse spam in mijn comments te vinden, compleet met verwijzingen naar een .nl domein:


Beste Camera
beste-camera.nl
NicciBoekestijn@gmail.com
94.215.165.138
Submitted on 2010/01/01 at 11:57pm
Normaal reageer ik niet op blogs, maar deze keer wil ik toch even aangeven dat het een mooie blog is!

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Another one in the series “messing around until I got it right”…

I wanted to get access to the local network at my parents house to manage computers using remote desktop. Now it is quite simple to tunnel IP traffic over a SSH connection, but I wanted proper access to the network. I just want to open mstsc on my own computer, enter the local IP address of the computer I want to access and be able to do my stuff. Read more »

Today I had an annoying attack on my Cisco 851W router. Some (likely) compromised computer in Laos was trying to bruteforce my SSH access wich I have open to the Internet for monitoring purposes. I noticed it because while  there was no traffic going through the router the WAN light was still flashing in a steady pace. Read more »

A couple of days ago the Cisco 851w router I ordered was delivered. I purchased this device because my old wireless router, a Netgear WGR614v6 was having a hard time with the many NAT entries caused by the increased amount of (wireless) users. I also wanted to increase my experience with configuring Cisco hardware. Read more »