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From my home workshop:
Mk I receiver proto (blue breadboard). Top part of the blue breadboard is the
display unit, lower part the receiver proper (the processor and LED's to mimic
C-MOS switches).
Pot transmitter is on the white breadboard.
Yellow LED's to show speed setting.
On the right is the finished button transmitter
Mk II
To save space and labour the throttle selector muxes (one set for speed
and one for direction switch) were soldered in piggyback fashion.
This is not yet tested -- and belongs to the series "don't try this at home!".
Top wires (9,10,11) are 8-ch analogue mux channel selectors. The gray (3) is
inhibit that disconnects IR-throttle selected to channel 0. (this is
a bit odd: we get binary ch selection as 0...8 from IR-throttle, and this
needs to be decoded into ihibit + channel 0...7 to represent ch 1...8). Brown
wire (pin 6) goes to speed mux (or direction switch) of the IR-throttle.
stacked connections are the power supply and to replace TMW-DCC's 8
cab speed pots or dir switches.
Well -- I got this far (the piggyback chips are not yet fitted), when
I started to think: I have at least three times as much stuff on this card
than the rest of the TMW-DCC setup has. Not such a clever design after all...
Mk III
So, I swapped the lot to this:
This is the PC-eliminator opened:
On the left is the D-25 connector for TMW-DCC LPT connector, on the right
top the 3.5mm jack for daisy chained IR receivers, yellow LED to show if data is coming,
5-pole stereo DIN socket for display unit, green LED to show the system is on
and a 2.5mm dc-adapter connector for power.
The Vero board has PIC16F84 with xtal (and caps on the side), and one latching
shift register for LPT interface, voltage regulator and a capacitor to smoothen up.
The rest is in the software (Bugs!).
The PC-eliminator schematic.
P2 is the IR-module connector,
P3 is for the display unit (same as in MkI/II)
P4 is the LPT-connector D25F. It can be connected directly to TMWDCC
aluminium box with a gender changer or with the D25M-D25M cable that we used
for connecting the TMWDCC aluminium box to PC.
P1 (not drawn) is the power supply. The system uses a battery eliminator,
rectifier, 1000uF/25V electrolytic capacitor and a 7805 three terminal regulator
for power supply (not drawn).
The throttle top view
Top switches are for F0/FL and F1, direction is on the side, pot for speed and at the
bottom is the 14/28 speed step selector, loco address selectors (1..99) and
button to activate the channel selection
Inside the throttle
The Vero board: Top are the IR-leds (LD271) and their resistors (1R8), then the IR led driver
transistor (TIP41), 4.000 MHz crystal w. 33pF caps, the PIC16F83 processor
and 1000uF electrolytic capacitor to support the IR LED's huge drain.
In the middle: the 1M pot, 100K trimmer and 10K resistor to adjust the pot zero
point.
At the bottom: the 14/28 step switch, BCD-switches and address activating button.
BCD-switches and diodes. Note that one of the yellow wires has been squeesed
while the unit was fitted.
Mk III potentiometer transmitter schematic.
The 6V power supply is from 4 AA battery cells. The schematic also shows how
the diodes were soldered to switch terminals.
13433 kävijää/visitors
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