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Model Train Dual Radio Control

Using low-power radio devices

Model Train Dual Radio Control
Here’s the problem—two grandchildren each with a remote controlled train set but both IR remote controllers use the same channel! Short of banishing one to play in another room the author came to the rescue with the help of radio modules.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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 its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

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Transmitter: PCB 130160-1
R1,R4,R5,R6 = 10kOhm
R2 = 330Ohm
R3 = 4.7kOhm
P1 = 5kOhm trimpot
C1 = 10µF 25V
C2 = 47µF 16V
C3–C6 = 100nF
D1,D2 = BAT43
D3 = LED, 3mm, red
IC1 = PIC18F1422-I/P, programmed, Elektor Store # 130160-41, [5]
IC2 = LP2950CZ-3.3/NOPB
MOD1 = RFM12B-433, 3.3V version (Hope RF), or 868 / 915 MHz 3.3V version depending on area.
K1 = 2-pin pinheader
K2 = 5-pin pinheader
S1 = 2-pin pinheader and/or slide switch, 1 make contact
S2,S3,S4 = pushbutton
PCB # 130160-1 [5]
Receiver: PCB 130160-2
R1–R4,R7,R8 = 10kOhm
R6,R9 = 1kOhm
R5 = 330Ohm
C1,C3–C6 = 100nF
C2 = 47µF 16V
D1,D3 = BAT43
D2 = LED, 3mm, red
T1,T2 = BC547
IC1 = PIC18F1422-I/P, programmed, Elektor Store # 130160-42, [5]
MOD1 = RFM12B-433-D, 3.3V version (Hope RF), or 868 MHz 3.3V version (country-specific)
K1 = 4-pin pinheader
K2 = 5-pin pinheader
PCB # 130160-2 [5]

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