ArduinoMarsAirlockSystem

I made an Airlock system that opens the door, slowly closes the door, and locks the door. Originally I had a few problems with the project. I actually wanted to give it two more sensors, an Ultrasonic sensor and DHT11 sensor. Unfortunately the DHT11 sensor wasn't working and the Ultrasonic Sensor was broken. I decided to add LEDs to distinguish all 3 systems. Then I realized my LCD1602 wasn't working, so I tried rewriting that portion of code but it still didn't work. I downloaded some installations on Arduino IDE and it still didn't work. Then I realized I needed a potentiometer, and when I added it, it worked. I also ran into a problem with my servo motor not being calibrated to the same amount of degrees each time, I fixed it by rewriting the code to calibrate it to 0 degrees everytime the code runs. Now that I've ran into these problems, hopefully it will be easier to make hardware next time.