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Wireless Quiz Buttons RGB Style

Whack-proof and no cable hassle

Wireless Quiz Buttons RGB Style
Playing quizzes in a rowdy pub or in a classroom full of hollering youths requires a system that’s fast, reliable and wire-free. It should also underscore fairness as well as the Quizmaster’s authority. Add bells & whistles, some lights, a Magic Reset Hand, and the fun can start.
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Products
Relevant websites
Extra info, Update
* NRF24L01+ 2.4 GHz transceiver * Participant’s desks are R(ed), G(reen), B(lue) * 3-channel with instant R-G-B LED indicator * First to press locks out competitors for 2 s * Reset with Quizmaster’s magic hand wave * Cheap, common 12-V RGB LED
Components
Download the BOM list
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
Component Lists
Transmitter
R1 = 10kOhm,
R2 = 6.8kOhm
C1,C2 = 100nF, 50V, X7R, 0.2’’ pitch
C3 = 100µF, 50V, 3.5mm pitch, 8x11 mm
IC1 = ATTINY85-20PU, programmed, Elektor Store # 150499-42 (RED)
IC1 = ATTINY85-20PU, programmed, Elektor Store # 150499-43 (GREEN)
IC1 = ATTINY85-20PU, programmed, Elektor Store # 150499-44 (BLUE)
Bt1 = Battery holder for CR2032
K1 = 6-way boxheader (optional)
S1 = big dome pushbutton. Red: Sparkfun # COM-09181;
Green: # COM-11275; Blue: # COM-11274
PCB, Elektor Store # 150499-2 V1.0
Pinheader receptacle, 2 rows, 8-way, vertical, 0.1’’ pitch (optional for MOD1)
CR2032 Lithium battery
Alternatively: Kit of parts, Elektor Store # 150499-71. See Receiver component list.
Receiver
Resistors
All carbon film, 5%, 0.25W, 250V
R1 = 1kOhm
R2 = 10kOhm
R3,R5,R6,R8,R10 = 120Ohm
R4 = 2.7kOhm
R7,R9,R11 = 12kOhm
Capacitors
C1,C2,C3,C4,C6,C12 = 100nF, 50V, X7R, 0.2’’pitch
C5,C7,C11 = 100µF, 50V, 3.5mm pitch, 8x11 mm
C8 = 10µF, 50V, 2mm pitch, 5x11mm
C9,C10 = 22pF, 50V, C0G/NP0, 2.5mm pitch
Semiconductors
D1 = 1N4007
LED1 = red, 3mm
LED2 = IR, 940nm, 5mm, TSAL6100
T1,T2,T3 = BS170
IC1 = LP2950-33LPE3
IC2 = MC7805
IC3 = TSOP58238 (38kHz), Newark/Farnell # 2251388
IC4 = ATMEGA328P, programmed, Elektor Store # 150499-41
Miscellaneous
F1 = 500mAT 20x5mm, with fuseholder, 20x5mm
JP1 = 3-pin pinheader
JP2 = 2-pin pinheader
K1 = DC barrel jack, 1.95mm pin, 12V, 3A
K2 = 6-pin pinheader, 0.1’’ pitch
K3 = 4-pin pinheader, 0.1’’ pitch
MOD1 = NRF24L01+ 2.4GHz wireless transceiver module (2x4-pin), Seeed Studio #113990011, Elektor Store # 150499-91
JP1,JP2 = jumper, 2-way, 0.1’’ pitch
Pinheader receptacle, 2 rows, 8-way, vertical, 0.1’’ pitch (optional, for MOD1)
LS1 = miniature loudspeaker 8Ohm, e.g. KINGSTATE # KDMG20008
X1 = 16 MHz quartz crystal, CL=18pF
12V RGB LED-strip
PCB 150499-1 V1.1
Alternatively: Kit of parts, Elektor Store # 150499-71. Contains 1 receiver PCB, 3 transmitter PCBs, 4 programmed micros, 4 NRF24L01+ modules.

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