Canal Hill

The hill by the canal has finally been painted. Whilst this all looks too shiny at the moment, it’s only a base for the grass/rocks/scrub that will eventually follow.

There is now a retaining wall separating the railway from the hill:

 

CANTOTI

The CANTOTI firmware is an extension of the CANACE8C v2g firmware and is designed to run on the MERG CANACE8C board. FlimConfig V14510 or later is required to configure the CANTOTI firmware.

Whilst the firmware is primarily designed to be used with TOTI (Train OTrack Indicator) hardware, it is also suitable for monitoring other inputs, particularly if inversion or input conditioning is required.

Unlike previous versions of CANACE8C firmware, this code samples each input every 10mS, and will generate an event when each input is the same state for more than a configured number of samples.

Each input can be optionally inverted to allow for an “Active High” input.

To allow for noisy signals being connected to the CANTOTI, optional delays can be enabled on an input by input basis.

If “Delayed input” is enabled for an input, the input must be ON for at least the “On time” before an ON event is generated, and must be OFF for at least the “Off time” before an OFF event is generated.

The “On time” and “Off time” are set in units of 10mS, with a minimum time of 10mS and
a maximum time of 2540mS.

If “Delayed input” is not enabled for an input, the input must be ON for two 10mS samples before an ON event is generated, and must be OFF for two 10mS samples before an OFF event is generated.

The “Extended Configuration” value is not currently used; ensure this is set to 0 for
future upgrade compatibility.

The current CANTOTI firmware defaults to an input “On time” of 100mS and a “Off Time” of 500mS.

In addition, there is a build for the CANACE8C itself. This has the standard CANACE8C module ID, and defaults to to an input “On time” of 10mS and a “Off Time” of 10mS.

Download CANACE8C & CANTOTI_v2j Firmware

TOTI Hardware

A wide variety of circuits can be used to detect trains. One of the simplest is this one:

This is for a DCC layout only; the diodes would be connected in series with the DCC feed to the track to be monitored. This requires an opamp with ground referenced inputs such as a LM324, and can easily be powered from the track itself.

I’m using three prototype DCC-TOTI boards (designed by Trevor Stockhill), each attached to a CANACE8C running the CANTOTI firmware:

These PCB’s are available from MERG as ‘DCC ToTI 8 PCB Part Number: 968‘.

DCC-TOTI V1_01 PCB Overview (c) Trevor Stockhill 2012
DCC-TOTI V1_01 Component Layout (c) Trevor Stockhill 2012

The details for this PCB are here:

Download/View DCC-TOTI V1.01 Schematic

Download/View DCC-TOTI V1.01 PCB Layout

Download/View DCC-TOTI V1.01 Bill Of Materials

Download/View DCC-TOTI Build Instructions