Dilshan R Jayakody’s Web Log

This is an automatic Cat6 / Cat5 network cable tester designed using NE555 timer and 4017, decade counters. This unit test all 8 wire lines of twisted pair network cable and indicate pass/fail status with a single LED. We design this unit to test network connectivity issues in Cat6 / Cat5 cable systems and it is capable to check both crossover and straight-through type network cables. A prototype version of network cable tester. The recommended way to construct this circuit is on PCB. Both Master and Salve units need to be built on two separate boards. To perform test one end of the network cable must be connected to the Master unit and other ends need to be connected to the Slave unit. After connecting both Master and Slave units press " START-TEST " (S1) button to perform the test. Status of the cable is indicated through LED2 ( PASS indicator). PCB and schematic of this unit are available to download at google drive and easyeda.com .

UPS system is a common peripheral in computer field. Now most of these UPSs are equipped with USB driven system shutdown software. But some of the cheap UPS system may not have software controlled PC shutdown systems and some of them had some limitations too (for example operating system compatibility issues, supporting for multiple nodes, etc.). In this post we design power failure monitor with centralize power switch for array of PCs. Using this system administrators can turn on multiple PCs with single button press and all of these PCs get power down automatically at power failure. To reduce cross platform issues we design this interface to work with main-board power switch and because of this administrators may not need any special software for this system. Most important point of this system is its independence with UPS hardware. Prototype of centralize power switch project Main controller of this system is PIC10F200 - 8bit microcontroller. Thanks to its SOT-23 package w...