|36||AUTOMATED NBA GAME CLOCK STOPPER
|Akshatkumar Sanatbhai Sanghvi||design_document4.pdf
|# Automatic NBA Game Clock Stopper
- Rahul Harikrishnan (rahulh2)
- Pranav Saboo (psaboo2)
- Saud Tahir (saudtt2)
Within the last two minutes of an NBA game, the game clock is supposed to stop after each made shot. However, as viewers, we have seen delays in the manual stopping of the clock due to human reaction speed. An accurate stoppage of time is crucial for close games as every tenth of a second matters.
We want to develop a system that will track when the ball goes through the hoop and send a signal to a receiver which will stop the game clock. There exist basketball machines that use optical sensors to detect when a ball goes through a hoop. However, this system is dependent on the fact that only the basketball will be near the hoop at all times and that the ball has no chance of going through the hoop from below. As a result, the single optical sensor is only suited for shooting practice rather than a real game. In a real game, athletes are trying to block shots, make layups from right below the basket, and fight for rebounds. This could falsely trigger the optical sensor. In the case of the problem, this would then falsely stop the time. We instead propose to use a system that consists of three sensors near the basket.
One sensor, an infrared sensor, would be placed right above the rim and behind the glass to detect the distance to determine if the basketball is within the range of the circular area of the rim. Another sensor, an optical sensor, is located at the bottom of the rim-backboard junction. This sensor’s primary function would be to determine when the ball clears the rim.
A third sensor will also be needed at the rim-backboard junction. This will be a thermal sensor with the primary function to determine if the ball or a player's hand is passing through the bottom sensor. All three of these sensors will work together to determine if a shot is made. At this point, a signal will be transmitted to a receiver that stops the game clock.
# Solution Components
## Subsystem 1 - Score Detection
For the score detection to work, we will implement a 3 sensor system:
Sensor 1: Infrared sensor that can detect the ball on the other side of the backboard.
Sensor 2: Optical sensor that detects an object below the rim.
Sensor 3: Thermal sensor to make sure the object detected by the optical sensor is not a hand.
## Subsystem 2 - Clock Control
The signal data from the score detection system will be sent to a microcontroller that is attached to the game clock. The microcontroller will run software that determines if a shot is made. The software will detect a made shot if sensor 1 is triggered before sensor 2 and sensor 3 doesn’t detect body heat signatures. After determining a made shot, the microcontroller will stop the clock.
# Criterion for Success
The final product will be considered successful if it meets the following criteria:
- Should be able to detect a shot from 10-degree increments along the 3 point line and from random points within the court.
- Should be able to detect a dunk where the player hangs on to the rim and a layup
- Should be able to reject a hand mimicking a made shot or attempting a rebound.
- Stop signal should be sent within 0.1 sec of the made shot, a marked improvement from an average human reaction speed of around 0.25 sec.