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Traffic light by STM32F103C8T6

This project is about simulating a traffic light. There is a 1-digit common anode 7-segment which shows how long each signal is on. I connected three 220v signal lamp as its lights by a relay board which its relays work at 5v. Output voltage of stm32f103c8t6 is 3.3v so I used three transistors as switches to convert 3v output to 5v that is needed for relay board.
Download link:
https://drive.google.com/open?id=1UVHMYvGlCxITk0jRz3Y8TPV_h8HHZmJN


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