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Long time before, I made a post "self-designed a network cat5 cable tester." Post said the use AVR microcontroller to do in a fast detector. Unfortunately, since then got me to be a preparation for the 2008 robot competition, Zhongshan, until the end of the game. Micro-teaching, examination, course design, etc.
Surrounded them, there really is empty. Recently some idle hands to do it should be noted that, in the last cable tester was mentioned should be added in the LCD to do. After careful consideration I have not joined in the design of LCD, the following reasons:
1. This is just a network cable tester for testing cable off, rather than analytical instruments, not LCD.
2. From a product point of view, the function of this thing is very simple, LCD and other precious device will only add more cost, no other benefits.
Of course this is just personal opinion.

This design can achieve the following functions:
1, the Network Cable Tester: rapid detection of network cable off (detection time of less than one second), and determine the linear network cable (straight-through cable or crossover cable.) If the network cable in the eight lines are connected properly, then determine the line, if the cable is a straight line (or cross lines), the straight line (or cross-line) of the LED indicator light, buzzer sounds to indicate the line normal. Otherwise, the test device without any reaction.
Note: This feature only in the detection of the normal straight line or cross line will be bright LED lights and beeps.
2, the remote detection: This feature is considered to have been installed cable test. The network cable connector plugged into the host interface and sub-machine interfaces, the host will output Marquee, in the child should receive the appropriate machine at the Marquee. Plainly, the test is in this mode is a normal network cable tester.

The function of survey line will not refer. Test results for the main display, or vice machine. Which is small, the battery did not prevail.
If it is flashing, there may be hit at the same time line problems. Go to a normal use of the LAN Cable Tester detected by measurement of line and try to swap to see if flash will not have the same phenomenon is measured to determine if the problem thread. If properly used, may be you make the cable problem.

There are three Cable problems:
1. Line due to the quality of the cottage, the replacement wire.
2. May be the result of cottage crystal head, crystal head and use a good point, it is best to use copper is three pronged.
3. Pressure line along line tools and practices, the proposed replacement of a good point Crimping Tool, cis-8-thread line must be kept into the crystal head is parallel to the line in the press without clearance. Pressure line note to stay wired leather head in the crystal, and to ensure compaction.