Low(Velmax) = above + 1 = 600*(Series_num) + 402
High(Velmin) = above + 1 = 600*(Series_num) + 403
Low(Velmin) = above + 1 = 600*(Series_num) + 404
High(Velavg) = above + 1 = 600*(Series_num) + 405
Low(Velavg) = above + 1 = 600*(Series_num) + 406
High(SD) = above + 1 = 600*(Series_num) + 407
Low(SD) = above + 1 = 600*(Series_num) + 408
This allocation of EEPROM memory leaves addresses 0
through 499 and 6409 through 8191 free for future data.
The design uses 13 small double-sided PCBs. The µC
unit uses the Chronograph_uC PCB and each screen uses
two of the Chronogrph_Sensor PCBs, along with two of
the Chronograph_Photodiodes_IRleds PCBs.
The Chronograph_uC PCB is fairly straightforward.
After soldering the components and the wires to the
connectors and switches, mount the board on the back
panel. I used plain faucet washers as insulators between
this board and the back panel. The same was also used
for mounting the LCD. The LCD is connected to the PCB
using ribbon cable and IDC connectors. If needed, there is
a small area on the board for future prototyping.
For the printing on the
front and back panels, I
used weatherproof vinyl
stick-on labels3. Using
an inkjet printer, I
printed both labels,
cut the openings in
the panels, stuck on
the labels, and
then cut the
openings. As a
final touch, each
label was then lightly
sprayed with an acrylic spray4 for added protection.
■ FIGURE 2