The binary code
.
In the simplest binary code a wide dark band represents the digit 1 and a thin dark band
represent the digit 0. The wide spaces between the dark bands have fixed width which is the
same as the thin dark band.
"
light pen"
"
light pen" contains a diode laser and
detector inside a device which has the
shape of a pen. It emits a narrow beam
of laser light and the user move the
"
light pen" manually along the label
with the bar code. The detector inside
the "light pen" receive the reflected
light from the bar code and transfer it
to the computer
.
