The segment is a combination of 7 LED lines or segments. The segments of the display lights in different combinations to display Numbers from 0 to 9, the Arabic Numerals. The number is displayed by the code or any encoder-decoder IC which gives the command to light LED to make combination and display numbers.
74HC04 7404 SMD Hex Inverter IC
FT232RL USB to UART TTL Serial Adapter Module for Arduino
1.3 inch I2C IIC 128×64 OLED Display Module 







