Quizmaster

the 1-wire model

With some simple hardware, ditto Windows program and a PC, it is possible to determine which of up to 20 switches is pressed first. Even the exact order can be displayed on a PC monitor. Ideal for quizzes and other games!The most remarkable feature of this QuizMaster is its simplicity. In its entirety, it consists of no more than a trivial interface, a number of pushbuttons and a Windows program. The interface comprises, all in all, seven components and is connected to the COMport of a PC. The pushbuttons for the quiz contestants (a maximum of 20) are fitted with a ‘1-wire multidrop’-device and are all connected in parallel to the interface. The program, written in ‘C++ Builder’ from Borland, controls the entire system and displays on the PC screen the order in which the pushbuttons were pressed.

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Materials

000190-11.zip

Component list

Resistors:
R1 = 2kOhm 2
R2 = 220Ohm
Capacitor:
C1 = 10µF 16V
Semiconductors:
D1 = zener diode 3V3 500 mW
D2,D4 = BAT85
D3 = zener diode 6V2 500 mW
IC1 = DS2401
Miscellaneous:
S1 = pushbutton, 1 make contact (1 for every contestant or team)
RS232 connector
RJ-11 connection material
Disk, Windows-program and source code files, order code 000190-11 (free download or see Readers Services