DCC Vitrine-decoder

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STD DCC Vitrine-decoder

License: GPL 3.0

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Update time： 2024-01-02 15:44:11

Creation time： 2020-07-28 19:38:13

Description

DCC decoder to detect if tracks are occupied. Detection is performed by measuring voltage over a resistor / (high speed) diode. Feedback is provided via the (Lenz) RS_Bus. Relays can be used to swich track power on/off. The design is intended for a train display cabinet / shadow station. There are three tracks per level; to ensure precise track distance of 46 mm the tracks fit nicely in the PCB openings. The PCB has been assembled by JLCPCB. The total costs for 15 PCBs with all SMD components assembled is around 150 Euro (including tax and shipping). Costs do not include the Through-hole components, such as relays, jumpers and terminals. Software can be downloaded from Github: [https://github.com/aikopras/OPENDECODER22GBM](https://github.com/aikopras/OPENDECODER22GBM)

Design Drawing

schematic diagram

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ATMEGA16A
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DCC Interface
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RS-Bus
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Relays
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Rails
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PCB

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Board
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BOM

BOM download Purchase Parts

ID	Name	Designator	Footprint	Quantity
1	47uF	C1,C12	CAP-SMD_BD6.3-L6.6-W6.6-FD	2
2	22	R18,R17	R1206	2
3	15pF	C21,C22	C0402	2
4	10K	R41,R27,R28	R0402	3
5	10uH	L1	L0805	1
6	ES3D	D15,D16,D13,D14,D11,D12,D9,D10,D7,D8,D5,D6,D3,D4,D2,D1	SMB_L4.6-W3.6-LS5.3-R-RD	16
7	ATMEGA16A-AU	U1	TQFP-44_L10.0-W10.0-P0.80-LS12.0-BL	1
8	100nF	C3,C14	C0603	2
9	10uF	C2	CAP-SMD_L3.2-W1.6-R-RD	1
10	100	R1,R2,R3,R4,R5,R6,R7,R8,R10	R0603	9
11	0	R20	R0603	1
12	SOLDERPAD	SP2,SP3,SP1	SOLDERPAD	3
13	11.0592MHz	X1	OSC-SMD_L5.0-W3.2	1
14	ISP-6PIN	ISP	HDR-TH_6P-P2.54-V-R2-C3-S2.54	1
15	100nF	C4,C5,C6,C9,C8,C7,C10,C30	C0402	8
16	L78M05ABDT-TR	U2	TO-252-2_L6.5-W6.1-P4.58-LS10.0-TL	1
17	SM4007PL	D18,D17	SOD-123F_L2.8-W1.8-LS3.7-RD	2
18	600Ω	L2	L0805	1
19	1K	RN1,RN2	RES-ARRAY-SMD_0603-8P-L3.2-W1.6-BL	2
20	1N4148	D25,D32	SOD-323_L1.8-W1.3-LS2.5-RD	2
21	MB10S_C2488	D20	DIO-BG-SMD_4P-L4.9-W4.0-P2.54-LS7.0-TL	1
22	100	R29	R0805	1
23	1K	R22	R0805	1
24	TS-1187A-C-C-B	SW1	SW-SMD_4P-L5.1-W5.1-P3.70-LS6.4	1
25	6N137	OK4	SMD-8_L9.8-W6.6-P2.54-LS10.3-BL	1
26	MMBT5401	T4,T5	SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR	2
27	KT-0603R	LED1	LED0603-R-RD	1
28	EL357N(C)	OK3,OK2	SOP-4_L3.9-W4.4-P2.54-LS7.0-TL	2
29	1.5K	R43,R44,R45,R21,R46	R0805	5
30	CON-JK	CON1	STL(Z)-950-2-H	1
31	MMBT5551	T2,T1,T3	SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR	3
32	22K	R31	R0603	1
33	ZMM5V6	D31	LL-34_L3.5-W1.5-RD	1
34	220	R24	R0603	1
35	1.5K	R30	R0603	1
36	10K	R9	R0603	1
37	RS-bus connector	CON2	STL-1550-2-V	1
38	4N35S-TA1	OK1	OPTO-SMD-6_L8.5-W6.5-P2.54-LS9.2-BL	1
39	33	R23	R0603	1
40	2K	R32,R33,R34,R35,R36,R37	R1206	6
41	ULN2803ADWR	U3	SOIC-18_L13.8-W7.5-P1.27-LS10.3-BL	1
42	RT424F12	RE3,RE2,RE1	RT424	3
43	H0-TRACK-REMOTE	TR6,TR7	BIG-PAD	2
44	H0-TRACK	TR0-1,TR2-3,TR4-5	H0-TRACK	3