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STD DCC Lift decoder

License: CC-BY 3.0

Mode: Editors' pick

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Update time: 2024-01-02 15:40:47
Creation time: 2020-06-02 16:46:10
Description
Decoder to control an elevator (lift) for model trains. The print includes two micro controllers. The ATMEGA 328 is used to control two stepper motor drivers (X and Y = left and right). Software is intended to be [GRBL](https://github.com/gnea/grbl/wiki). Limit switches can be connected via two [opto-couplers](https://github.com/gnea/grbl/wiki/Wiring-Limit-Switches). The ATMEGA 2560 is the main processor that: - Sends commands to the GRBL ATMEGA 328 - Receives [DCC](https://en.wikipedia.org/wiki/Digital_Command_Control) commands from a DCC master station - Sends feedback messages via the [RS-Bus](https://sites.google.com/site/dcctrains/rs-bus-feed) to the master station - Has 14 digital inputs for buttons and/or IR receivers (light barriers) - Has 14 digital outputs for LEDs and/or IR transmitters (light barriers) To offload the ATMEGA 2560, the software can be split over multiple PCBs. Communication between the PCBs takes place via a RS485 bus. Only 1 of the PCBs need to receive external power (AC 12-18V), the others may receive power from the main PCB. Costs for 5 PCBs with all SMD components assembled is around 100 Euro (including tax and shipping). Costs do not include the Through-hole components, such as jumpers and terminals. - Updated 2020/07/14: PAD spacing SS34 reduced
Design Drawing
schematic diagram
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PCB
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ID Name Designator Footprint Quantity image
1 DB128L-5.08-2P CON1,CON2,CON3,CON4,CON5,CON6,CON7,CON8,CON9,CON10,CON11,CON12,CON13,CON14,CON15,CON16 CONN-TH_2P-P5.08_DB128L-5.08-2P 16 DB128L-5.08-2P
2 ULN2803ADWR U7,U8 SOIC-18_L13.8-W7.5-P1.27-LS10.3-BL 2 ULN2803ADWR
3 470uF C1 CAP-TH_BD10.0-P5.00-D1.0-FD 1 KF471M050G200A
4 10uF/50V C2 C1206 1 CL31A106KBHNNNE
5 100nF C3,C4 C1206 2 CL31B104KBCNNNC
6 150pF C5 C0805 1 0805B151K500NT
7 22uF C6 C0805 1 CL21A226MAQNNNE
8 4007 D1,D2,D3,D4,D5 SOD-123F_L2.8-W1.8-LS3.7-RD 5 SM4007PL
9 SS34 D6 DO-214AC_SS34_PAD_DISTANCE_UPDATED 1 SS34_C8678
10 Resettable fuse F1 FUSE-TH_L7.8-W3.0-P5.10-D0.5-S2.00 1 JK60-050_C369084
11 JP2E JP1,JP2 JP2 2 JP2E
12 JP1E JP3,JP4 JP1 2 JP1E
13 10uH L1 IND-SMD_L7.1-W6.6 1 MWSA0603-100MT
14 43K R1 R0805 1 0805W8F4302T5E
15 8.2K R2 R0805 1 0805W8F8201T5E
16 100K R3,R4 R0805 2 0805W8F1003T5E
17 10K R8,R9,R10,R5,R36 R0603 5 0603WAF1002T5E
18 470 R11,R12,R13,R14,R15,R16,R17,R18,R19,R20 R0805 10 0805W8F4700T5E
19 R-RJ45R08P-B000 RJ1,RJ2 RJ45-TH_R-RJ45R08P-B000 2 R-RJ45R08P-B000
20 MP1584 U1 SOIC-8_L5.0-W4.0-P1.27-LS6.0-BL-EP 1 MP1584EN-LF-Z
21 SP485EEN-L/TR U2 SOIC-8_L5.0-W4.0-P1.27-LS6.0-BL 1 SP485EEN-L/TR
22 CON_2P_5MM-VERTICAL PLUG2,PLUG1 PHOENIX MSTBVA 2,5/2-G 2 CON_2P_5MM-VERTICAL 1
23 100nF C7,C8,C9,C10,C11,C12,C16,C19,C20,C21,C22,C23 C0603 12 CC0603KRX7R9BB104
24 15pF C13,C14,C17,C18 C0603 4 CL10C150JB8NNNC
25 2510S-3P CON18,CON19,CON20 MOLEX-3P 3 2510S-3P
26 300S-16P ISP2560 IDC-TH_300S-16P 1 300S-16P
27 10uH L2,L3 L1206 2 CMI321609X100KT
28 19-217/GHC-YR1S2/3T LED3 LED0603-R-RD 1 19-217/GHC-YR1S2/3T
29 19-217/BHC-ZL1M2RY/3T LED4 LED0603-R-RD 1 19-217/BHC-ZL1M2RY/3T
30 19-213/Y2C-CQ2R2L/3T(CY) LED5 LED0603-R-RD 1 19-213/Y2C-CQ2R2L/3T(CY)
31 1.5K R6,R7,R35,R21,R22,R23,R24,R29,R37 R0805 9 0805W8F1501T5E
32 ATMEGA2560-16AU U5 TQFP-100_L14.0-W14.0-P0.50-LS16.0-BL 1 ATMEGA2560-16AU
33 16MHz X1,X2 OSC-SMD_4P-L3.2-W2.5-BL 2 X322516MLB4SI
34 100nF C15 C0805 1 CC0805KRX7R9BB104
35 1N4148 D9,D10,D11,D12,D13,D8 SOD-323_L1.8-W1.3-LS2.5-RD 6 1N4148WS T4
36 KT-0603R LED1,LED2 LED0603-R-RD 2 KT-0603R
37 6N137 OK3 SMD-8_L9.8-W6.6-P2.54-LS10.3-BL 1 6N137S1(TA)
38 EL357N(C) OK4,OK2 SOP-4_L3.9-W4.4-P2.54-LS7.0-TL 2 EL357N(C)(TA)-G
39 10K R25,R26 R0805 2 0805W8F1002T5E
40 100 R27 R0805 1 0805W8F1000T5E
41 1K R28,R40,R41 R0805 3 0805W8F1001T5E
42 B3F-1000 SW1 KEY-TH_4P-L6.2-W6.2-P4.50-LS6.5 1 B3F-1000
43 MMBT5401 T4 SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR 1 MMBT5401-C8326
44 RS-bus connector CON17 STL-1550-2-V 1 WJ381V-3.5-02P-14-00A
45 ZMM5V6 D7 LL-34_L3.5-W1.5-RD 1 ZMM5V6
46 CNY17 OK1 DIP-6_L7.3-W6.5-P2.54-LS7.6-BL 1 CNY17-4
47 120 R30 R0603 1 0603WAF1200T5E
48 33 R31 R0603 1 0603WAF330JT5E
49 22K R32 R0603 1 0603WAF2202T5E
50 220 R33,R38,R39 R0603 3 0603WAF2200T5E
51 1.5K R34 R0603 1 0603WAF1501T5E
52 MMBT5551 T1,T2,T3 SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR 3 MMBT5551_C2145
53 300S-10P CON21,CON22 IDC-TH_300S-10P 2 300S-10P
54 2560 ISP328 HDR-TH_6P-P2.54-V-R2-C3-S2.54 1 300S-6P
55 ATMEGA328P-AU U3 TQFP-32_L7.0-W7.0-P0.80-LS9.0-BL 1 ATMEGA328P-AU
56 EL357N(C)(TA)-G U4,U6 SOP-4_L3.9-W4.4-P2.54-LS7.0-TL 2 EL357N(C)(TA)-G

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