Wireless Quiz Buttons RGB Style
Whack-proof and no cable hassle
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.
Elektor recommends the Elektor PCB Service service from its business partner Eurocircuits or AISLER as the best services for its own prototypes and volume production.
The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.
Extra info / Update
* 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
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 list
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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