Axiris Arduino Manuel d'assemblage - Page 11

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IV-3 VFD shield for Arduino

PNP transistors

Mount the BC557B transistors T14
... T25.
Mount them so that the top of
their housings stays below (or is
flush with) the Arduino headers.

Tube backlighting LEDs

You can use 3mm standard LEDs
in any color for tube backlighting
purposes, even RGB color fading
LEDs.
Bend the leads of the LEDs so that
the LEDs fit in the 3mm holes
underneath the VFD tubes, then
solder
them
to
the
pcb.
Pay
attention to polarity. The short
lead of the LED (cathode) is
soldered to the pad closest to the
LED
name
silk-screen
marking
(D6 ... D8).
It may be necessary to insulate
the leads of D9 to avoid them
touching the ISP connector on the
Arduino.
The LEDs are connected to a PWM
output on the Arduino and can be
dimmed using software. This will
however not work properly when
you use RGB color fading LEDs.
If it is easier for you, it is also
possible to mount the LEDs after
the VFD tubes are soldered in
place.
Due
to
the
mounting
technique,
it
is
also
easy
to
replace the LEDs later on if you
decide you would like to have another backlighting color.
Assembly Manual
11