![]() Though it is not impossible, you will have a difficult time making out what-is-what without part names. If you desoldered it from somewhere, hope you have some marking over it. They look alike and there is no way to tell which one you have by just seeing it. Yes, there are two types of 7 segment displays. If you are using a development board, you should read it’s documentation before addressing them. While addressing these segments, (in most cases) A is the LSB and DP(H) is the MSB. These 8 pins corresponding to each of the segments are connected to the port pins of a microcontroller. These segments are named with alphabets A through G with a DP (Decimal Point) or in some cases an eighth alphabet H. These are essentially LEDs that turn on according to the excitation given by the controller that gives the appearance of the number. As the name suggests, there are 7 segments to display a number and an additional decimal point. ![]() This post will deal with the basics of 7 segment displays and how to interface them with microcontrollers.
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