Universalboard for Wattenscheider

One of my main projects is the elektronic interlocking system "Elekdra". To control signals via Elekdra, the development of a decoder was necessary. Elekdra uses "LotusNet", a derivate of LocoNet by Digitrax, as the communication bus.

It also was necessary to develop a board, which receives and decodes messages from LotusNet and controls a signal correctly.

The first version of that board was done a time ago and is in operation now. The operation showed, that a redesign was necessary.

Status

Tests with prototype finished. Collecting reports auf needs.

Features

The board is basicaly used to control signals. Caused by the use of darlington arrays (ULN2803) and additionaly normal outputs and inputs, the board can control almost everything on model railroads, even turnouts. This just has a need for special software. The board outline was fixed by the space in the "Wattenscheider Schacht".

Controled via LotusNet
8 strong outputs (GND / High Impedant), can be paralleled
6 waek outputs
4 inputs
Fits into Wattenscheider Signalschacht
Output plug allows direct connection of servo motors
Powered from LotusNet

Design Files

Partlis as PDF: PDF

Eagle Files

Schematic: EAGLE, PDF (280kb)

Layout: EAGLE

Production files (Gerber) on request.

Pictures

Collection of needs

The collection of needs is finished. In the moment, the prices are collected. Order will follow.

Informations

Pinout outputs

PCB Border

W1 W2 W3 W4 W5 W6 VLN VLN

5V 5V 5V 5V 5V 5V VLN VLN

S1 S2 S3 S4 S5 S6 S7 S8

W1 .. W6 - Weak Outputs
S1 .. S8 - Strong outputs
5V .. Power 5V
VLN .. Power from LotusNet

Pinout Inputs

GND INT1 INT2 5V

GND SCL SDA 5V

PCB Border

INT1, INT2 - Inputs External Interrupts
SCL, SDA - Inputs, TWI
5V .. Power 5V
GND .. Ground

Software Development

Here the pins on the controler are described at the different plugs.

Pinout Outputs

PCB Border

PB3 (Weak) PB2 (Weak) PB1 (Weak) PD6 (Weak) PD5 (Weak) PD3 (Weak)(Shared with INT1 !) VLN VLN

5V 5V 5V 5V 5V 5V VLN VLN

PC3 (Strong) PC2 (Strong) PC1 (Strong) PC0 (Strong) PB5 (Strong) PB4 (Strong) PD7 (Strong) PD4 (Strong)

Pinout Inputs

GND PD3 (Shared with W6!) PD2 5V

GND PC5 PC4 5V

PCB Border