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Thank You for such an informative post. I made this entirely based on this post and it works great! Only thing I changed is that instead of D3 and D4 LED, I inserted a buzzer. It works. Thank You once again.
Thank You so much sir... I also needed to add a buzzer to get an audio response when a contestant pushes the button. Which is the best place to add it?
Quiz-O-Tron 3000: Arduino Quiz Contestant Lockout System