This is the final project for engineering 103, where we had the task to measure something in the environment, could've been temperature, sound, how many people there were in a room, etc. in my case I decided to measure the times where the room was busiest the most, for this project I used a HC-SR04 ultrasonic sensor which it would sense the people when they get close to the sensor and with that I can tell that someone just walked by it, getting an average of how busy the room was every 10 minutes.