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Traffic Signals for Model Railroads

Programming with ladder diagrams

Traffic Signals for Model Railroads
It all started with a simple question: could the author make a controller for traffic signals on a model railroad? That led to the rediscovery of ladder diagrams as a simple and effective way to create program logic.
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Extra info, Update
* Traffic signal for model railroads
* Ladder diagram programming
* Free programming environment
* Suitable for 12 V and 24 V
* All components through-hole
Component list
From the Store
160465-1 PCB
160465-41 Programmed microcontroller

Component List
Resistors
Default: 5%, 0.25W
R1,R3,R5,R7,R9,R11,R13,R15 = 100kOhm
R2,R4,R6,R8,R10,R12,R14,R16 = 1kOhm
R17,R18,R19,R20,R21,R22,R23,R24 = 2.2kOhm
Capacitors
C1,C2,C4,C6 = 100nF, 0.2" pitch
C3,C5 = 10µF 50V, 0.1" pitch
Semiconductors
D1 = 1N4004
IC1 = PIC16F628A, programmed, Elektor Store # 160465-41
IC2 = 78L05
IC3 = ULN2803
Miscellaneous
K1–K6 = 3-way PCB screw terminal block, 0.2" pitch
K7 = 2-way PCB screw terminal block, 0.2" pitch
K8 = 5-pin pinheader, 0.1" pitch
JP1 = 3-pin pinheader, 0.1" pitch, with matching 2-pin jumper
2x 18-pin DIP IC socket
PCB 160465-1
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