A, LED
LED long pin as a positive electrode, a negative electrode short leads.
Second, breadboard
(1) Specifications
Breadboard different size specifications, such as hole 170 (35 * 47mm), 400 holes (85 * 55mm), 800 holes (165 * 55mm) and the like.
Back some bread board has adhesive, easy to attach it on a different instrument.
(2) structure and an internal structure
The entire board manufactured using a thermosetting phenol resin, the end of a sheet metal strip, corresponding to the puncturing position such that the plate can be brought into contact with metal strip elements when inserted into the hole, so as to achieve the purpose of conducting, typically every five holes with a metal strip connected. Board generally have a central groove, which is required for the integrated circuit, chip testing and design. On both sides of the board has two rows of vertically jack (power rails), is a set of five, provides power for the components on the board.
1. Power rails
In the upper and lower sides of the breadboard, respectively two sockets, generally introduced as a power supply passage. Above the first row labeled "+" is a set of jack 5, (5 inside hole communicating), 5 per group were positive. Above the second row labeled "-" in a jack 5 groups, each group of five (5 holes communicating the interior), are grounded. Breadboard below the first row and the second row above structure. To use the entire breadboard, usually the "+" and "+" connected by a wire, "-" and "-" with a wire connected.
Breadboard power rail 
bread board power rail 2
2. Wiring rail
Connection hole divided into two parts, our primary workspace, and the original jumper for docking. In the same column of the jacks 5 (i.e. abcde, fghij) is in communication with each other; between the columns and the column (i.e., 1-30) and a groove upper and lower portions (i.e., ef) is disconnected.
Breadboard wiring rail -1 
breadboard wiring rail -2
(3) How to build a breadboard circuit
1. The series circuit example breadboard
2. Circuit Example parallel breadboard
