■ SCREENSHOT 3. The bottom-layer ground plane
has completed the ground path for the ZG2100M
and other components. Note that we did not push
the bottom-layer ground plane beyond or into the
ZG2100M’s no-trace zone.
and the PIC24FJ128GA006, let’s turn this paper Wi-Fi
design into real live Wi-Fi hardware. The build process
begins with designing and manufacturing a suitable PCB.
BUILDING A ZEROG -
I figured it was time to put a name on this design.
■ SCREENSHOT 4. This capture shows the NUD3105
thermal pad connections to the top-layer ground plane.
The heatsink tab of voltage regulator VR1 is also
programmed to meld with the top-layer ground plane.
With that, behold Screenshot 1. Just in case
you’re wondering why there is a silkscreen
legend outside of the PCB boundary to the left,
I needed to cordon off and identify the
ZG2100M module’s no-trace zone. The
ZG2100M datasheet recommends that no
traces (other than the surface exit traces you see
from pins 17 and 18) be placed within the small
rectangular area to the upper left of the
ZG2100M module pad farm. Eliminating traces
in this area will prevent the onboard PCB
All of the components you see in Screenshot 1 are
packaged in 0603 SMT with the exception of C1 which
is a 100 µF ceramic capacitor packaged in 1206 SMT.
Capacitor C2 is a 1.0 µF ceramic. There are no
polarities to worry about for C1 and C2. As you can see
in the Screenshot, the ZG2100M lays down just like an
Screenshot 2 is a full-board shot of the Trainer. All
of the PIC24FJ128GA006’s I/O pins are brought out to
+ 5.0 volts to power the Trainer, you can
choose your power poison for the auxiliary
board without having to worry about getting the
proper voltage to the components. To save you
some time and effort in your parts procurement
process, I have listed the Mouser and Digi-Key
part numbers for the large ceramic capacitors
and the FOX 8 MHz crystal in a notes box in
■ SCREENSHOT 5. The final layer is laid down
and I’ve looked the PCB design over for hours
now. It’s time to send this baby off to ExpressPCB