Introducing a robot fish that is able to swim and recognize tank edges and obstacles.  Find out how it can easily create it with common insulating material and a few servo motor controlled by Arduino. Arduino is a single-board microcontroller, intended to make the application of interactive objects or environments more accessible. The hardware consists of an open-source hardware board designed around an 8-bit Atmel AVR microcontroller, or a 32-bit Atmel ARM. Current models feature a USB interface, 6 analog input pins, as well as 14 digital I/O pins which allow the user to attach various extension boards.Using wireless Read more…


Supervisory Control and Data Acquisition (SCADA) is a process control system that enables a site operator to monitor and control processes that are distributed among various remote sites. A properly designed SCADA system saves time and money by eliminating the need for service personnel to visit each site for inspection, data collection/logging or make adjustments. Supervisory  control  and  data  acquisition  is  used  to  describe  a  system  where  both  data  acquisition  and supervisory control  are  performed.  Mobile Supervisory Control and  Data  Acquisition  (referred  to  as  Mobile SCADA) is the use of SCADA with the mobile phone network being used Read more…


Uninterruptible power supplies (UPS) mitigate voltage sags by supplying the load using stored energy. Upon detection of voltage sag, the load is transferred from the mains supply to the UPS. Obviously, the capacity of load that can be supplied is directly proportional to the amount of energy storage available. UPS systems have the advantage that they can mitigate all voltage sags including outages for significant periods of time (depending on the size of the UPS). There are 2 topologies of UPS available; on-line and off-line. Figure 1 shows a schematic of an off-line UPS while Figure 2 shows Read more…


Map-Reduce are a programming model that enables easy development of scalable parallel applications to process vast amounts of data on large clusters of commodity machines.  Based on this new framework, we perform extended evaluations of Map Reduce-inspired processing jobs on an IaaS cloud system and compare the results to the popular data processing framework Hadoop. Through a simple interface with two functions, map and reduce, this model facilitates parallel implementation of many real-world tasks such as data processing for search engines and machine learning. In recent years ad hoc parallel data processing has emerged to be one of Read more…


Steps to find the Installation date of a Operating system installed Linux CentOS and Red Hat

Steps to find the Installation date centos of a Operating system installed Linux CentOS and Red Hat On a CentOS or RedHat based Operation system You can easily find the date and time of the Server is installed. Method 1 :  Using, rpm command to find the basesystem and using the basesystem information we can use rpm -qi to find Date and time. Step 1 : First get the basesystem rpm by the below command.

eg. result below.

Step 2 : Copy the whole basesystem version number and input the below command.

eg. base on Read more…


plesk-12-throws-error-Internal error-system-cannot-find-file-specified-earneasy.net

Plesk version 12 throws error Internal error The system cannot find the file specified Recent update from the Plesk version 12 from odin crashed few files & its content. due to this you get the below error. Internal error: The system cannot find the file specified. Message The system cannot find the file specified. File Hierarchical.php Line 105 Type Exception  To Resolve the issue : odin also released a new path to address the issue. Reinstall the update using the command from console:

[/crayon] You can also use Plesk Panels GUI to update this micro update.  


sar command usage and details examples sar command usage and details examples System Activity Report – SAR used to report on various system loads, including CPU activity, memory/paging, device load, network. Linux distributions provide sar through the sysstat package.

Example :

sar command, sar usage, sar details, sar examples


spamd crashed, cpanel spamd re-installation on the server spamd crashed, cpanel spamd re-installation on the server When you see the exim panic log @ /var/log/exim_paniclog you will see the below errors

When we try to restart the service using. No response or solution to the problem.

the solution is to reinstall the spamassasin By the Below commands, we can successfully reinstall or upgrade the spamd or SpamAssasin

Alternatively, You can also do the upcp by forcing to upgrade the applications.

This will reinstall and upgrade even the versions are upto date. Drop in your Read more…

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