HardLabs

LCCTurnoutController

vsi5004·LCCTurnoutController·PCB/pcb.kicad_pcb

LCCTurnoutController PCB layout, top view — open source ESP32 board by vsi5004

About the LCCTurnoutController PCB

LCCTurnoutController is an open source ESP32 PCB design by vsi5004, published on GitHub. It is a 2-layer board measuring 116 × 74.5 mm, with 170 components from 37 distinct parts.

Its main chip is the MOUDLE-SEEEDUINO-XIAO-ESP32S3, from the ESP32 family. Other key parts include the PCA9685PW, MCP23017_SO, AP63205WU, AP2114-3.3 and LM358. By type, the board carries 68 resistors, 37 diodes, 16 transistors, 14 capacitors, 8 modules and 8 connectors.

It belongs with the robotics & motion and iot & wireless designs in this gallery.

From the project

A PCB that controls servo-actuated turnouts via LCC for Model Railroads

An open-source OpenLCB (LCC) turnout controller node that drives up to 8 servo-based turnouts with automatic frog polarity switching. Designed for N scale layouts where there isn't room for a mechanical frog switch, but powered frogs are still needed for reliable locomotive operation.

The board is built around a Seeed XIAO ESP32 module and communicates on the LCC bus via CAN (TWAI) through an RJ45 connector. Two I²C peripherals handle the outputs:

LCCTurnoutController, from the project README
From the project README

Main components on the LCCTurnoutController

PCA9685PWMCP23017_SOAP63205WUAP2114-3.3LM358TJA1051T-3MOUDLE-SEEEDUINO-XIAO-ESP32S3

LCCTurnoutController bill of materials (BOM)

170 components, 37 distinct parts.

QtyPartRefs
1
PCA9685PW
U2
1
MCP23017_SO
U3
1
AP63205WU
U4
1
AP2114-3.3
U5
1
LM358
U6
1
TJA1051T-3
U7
1
MOUDLE-SEEEDUINO-XIAO-ESP32S3
U8
8
Motor_Servo
M1, M2, M3, M4, M5, M6, M7, M8
16
MMBT2222A
Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 +8
1
EXT POWER
J1
1
TRACK POWER
J2
2
RJ45
J3, J4
1
FROG0-1
J5
1
FROG2-3
J6
1
FROG4-5
J7
1
FROG6-7
J8
1
VCC SOURCE
JP1
8
G6SK-2
K1, K2, K3, K4, K5, K6, K7, K8
1
Factory Reset
SW2
1
User
SW3
Show 17 more
QtyPartRefs
1
WiFi
D1
1
Activity
D2
16
1N4148W
D3, D4, D5, D6, D11, D12, D13, D14 +8
8
RED
D7, D9, D16, D18, D26, D28, D34, D36
8
GREEN
D8, D10, D17, D19, D27, D29, D35, D37
1
NUP2105L
D15
1
CAN TX
D24
1
CAN RX
D25
1
4.7uH
L1
3
10uF
C1, C8, C9
2
10uF
C2, C4
7
100nF
C3, C5, C10, C11, C12, C13, C14
2
22uF
C6, C7
22
10k
R1, R12, R13, R14, R15, R16, R17, R18 +14
12
220R
R2, R3, R4, R5, R6, R7, R8, R9 +4
32
1k
R21, R22, R23, R24, R25, R26, R27, R28 +24
2
4K7
R29, R30

LCCTurnoutController design files

The KiCad project lives in the vsi5004/LCCTurnoutController repository on GitHub; these links point at the commit this page was built from.

LCCTurnoutController: common questions

What microcontroller does the LCCTurnoutController use?

The LCCTurnoutController is built around the MOUDLE-SEEEDUINO-XIAO-ESP32S3, from the ESP32 family.

How big is the LCCTurnoutController PCB?

The LCCTurnoutController measures 116 × 74.5 mm, has 2 copper layers and is 1.69 mm thick.

How many components are on the LCCTurnoutController?

170 components, from 37 distinct parts. The full bill of materials is listed on this page.

Where can I download the LCCTurnoutController design files?

From the vsi5004/LCCTurnoutController repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the LCCTurnoutController design in my own project?

The repository has no license, so all rights stay with vsi5004. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the LCCTurnoutController without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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