Article

Quizmaster

radio-linked!

The Quizmaster described here is a four-player version with an extra player to operate the ‘box’ and to ask the questions etc. No wiring required between the player and quizmaster desks!Knowledge-based quizzes of the ‘University Challenge’ variety are extremely popular, and have spawned many derivates that can be seen on TV every day. Where many people would be perfectly capable of organizing a quiz, persuading players and a quizmaster to participate, drawing up a list of questions (geared to the contestants’ specific interest or level of education) and arrange a suitable venue, alas, building a ‘machine’ to detect the first key press, display the score, etc. often poses insurmountable problems. The present design should be easy to build by anyone with reasonable skills in DIY electronics.

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Materials

010030-PCB.pdf

010030-11.zip

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

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PCB

Download Gerber file: 010030-1.zip

Component list

Transmitter
Resistors:
R1 = 8-way 10kOhm SIL array
R2 = 100kOhm
R4..R7 = 10kOhm
R3 = 1MOhm
Semiconductors:
IC1 = HT12E (Farnell # 562415)
IC2 = AM-RT4-433 (RF Solutions)*
Miscellaneous:
K1-K4= jack socket, 2.5mm, mono, PCB mount
S1-S4 = pushbutton (external), 1 make contact
S5 = on/off switch
S6 = 8-way DIP switch
BT1 = 3-V battery with holder (or 2 off AA/AAA battery)
Receiver
Resistors:
R1 = 8-way 10kOhm SIL array
R2 = 68kOhm
R3-R7,R22 = 10kOhm
R8-R11= 5kOhm 6
R21 = 220Ohm
R12-R18 = 150Ohm
R19 = 100kOhm
R20 = 470Ohm
R23 = 47Ohm
R24 = 240kOhm
R25-R28=470Ohm
Capacitors:
C1,C2 = 10µ F 16V
C3-C6 = 100nF
Semiconductors:
D1 = 1N4001
D2-D6 = LED, green, 5mm dia.
IC1 = HT12D (Farnell # 563250)
IC2 = PIC17C44-16/P, programmed, order code 010030-41
IC3 = 74LS245
IC4 = ULN2803AP (Farnell # 3187032)
IC5 = 7805
IC6 = UM3561 (UMC) (Rapid Electronics # 82-0704, tel. 01206 751166)
IC7 = AM-HRR3-433 (RF Solutions) *
LD1-LD4= 2-digit 7-segment LED display, common cathode, e.g., Kingbright DC56-11EWA
T1-T4,T6 = BC548
T5=BC327
Miscellaneous:
K1 = mains adaptor socket, PCB mount
S1,S2,S3= pushbutton, 1 make contact, type CTL3 (Multimec) or DR-6
S4 = 3-way 1-pole switch
S5 = 8-way DIP switch
LS1 = 64Ohm loudspeaker
PCB, order code 010030-1 (combined board for receiver and transmitter)
* 433 MHz transmitter/receiver modules available as a pair from Maplin, order code VY48C.