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Some time ago, my brother
finished building his (new) speed trainer/timer. This device has an RJ9
(4P4C) output control port, which makes it possible to connect modules with
extra functionality to the (new) speed trainer/timer, as e.g. the voice
module which add speaking functionality.
The voice module simulates a track shooting commander and gives the
following commands: Ready, Fire, Stop and Finished controlled by the (new)
speed trainer/timer. If the battery voltage gets low in the voice module or
in the (new) speed trainer/timer, the voice module will of course also tell
you this with: Low Battery.
As you may have noticed the voice module has two RJ9 (4P4C) ports, and this
makes it possible to daisy chain more than one voice modules.
Below you can see some pictures of
the design (click on the picture to enlarge it):
| The empty voice module pcb. Schematic is included in the pcb file. |
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Pcb file
updated 2010.05.19 |
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The voice module pcb with all components mounted. The voice commands are
stored in a 18F452 PIC, converted to speech in a R2R DAC and filtered
through a 4'th order low pass filter. The filter op amp is powerful
enough to drive a pair of headphones directly. |
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A look inside the finished voice module case. It is powered by a 9V
battery, using approx. 25mA, which result in a 20 hour battery life. |
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The finished voice module case. It is connected to the (new) speed trainer/timer through one of the
RJ9 (4P4C) connector, and it is possible to
daisy chain more modules. |
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This page was last updated
2010-05-23.
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