You do not need to hunt for a massive and tangible scoreboard should the need for one arise next time -

This app should provide you with one that is specifically for a basketball match.  

This board features a buzzer that is massive in volume, a font size that can go full scale, and a total of four display types such as simple mode - which contains a timer plus scores, basketball mode - which contains a timer, scores, and a shot clock, shot clock mode - which has a timer and a shot clock, and a basket ref mode - which is a simple scoreboard for a referee.

Other features include a foul counter, timeout counter, tablet support, and a Bluetooth connection.