[Dr_C2]

As explained earlier, this approach is highly modular with only the first display module in the sequence requiring the opto-isolation on input data channels (of which there are 3) and the 12V and 5V LDO regulators.

So the current version has the sequence…

WWYGRRRRRGY

W=White
Y=Yellow
G=Green
R=Red

and so a total of 11 modules in a row and circa 1 metre wide.

This gives two useful operating modes:

First as a speed trap showing either

• car ID plus speed
  
• or car ID plus lap time
  (in each case two white digits followed by five red digits with the latter with numerical format xx.xxx)
  

Then, second, as a very large sized mirror of the start/finish gantry…

• five red lights towards the centre
  
• with one green light either side
  
• then with one yellow light further out either side
  (Here lights in each case are square patterns formed by the upper-most four segments of the seven segment displays).
  

This is a indeed a very large mirror of the start/finish gantry!

c