Besides on directly connected 7 segment with direct I/O port from microcontroller, we can also use the CD4511 (7 segment encoder) to help on decreasing the microcontroller I/O port and only required to send the binary data.
Nowadays, 7 segment has become the most popular display unit on market because it is cheap, easy to program and small. On market, we can found that there was 2 types of 7 segment which is common anode and common cathode. In this project, we are going to use 7 segment with common cathode and directly interface to microcontroller.
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