all of this with your Pi hooked up to a proper
keyboard and monitor.
3. MODIFY THE USB DAC (OPTIONAL)
If you only want to use Bluetooth audio, you can
skip this step.
Use your desoldering technique of choice to
remove the USB connector and the TRS audio
jack from the sound card/DAC. I was able to
get them mostly removed using a bit of braided
copper solder wick. The audio jack was a little
stubborn so I finished it off with some snippers.
Just be careful not to damage the pads on the
PCB! You can watch me do this about 13:25 in the
Part 2 video on YouTube.
4. LAY OUT YOUR COMPONENTS
From here on out, we’re going to be connecting
all the hardware. Before you solder anything in
place, lay out your components in the iPod case
and come up with a plan. Here’s where everything
ended up with mine (Figure
A
).
5. CREATE YOUR POWER RAILS
Inside the iPod, you need to provide 5 volts to the
Raspberry Pi, the display, the USB sound card,
and the haptic motor.
I found that having a centralized place to
route power from helped keep things organized.
(Yes, the images you see are organized, by my
standards.) I cut a piece of standard 0.1"-spaced
perf board with two columns: one for 5V and the
other for ground.
6. CONNECT USB DAC TO HEADPHONE JACK
(OPTIONAL)
Again, if you only want to use Bluetooth, you can
skip this step.
There are three connections to make here:
one to the tip of the audio cable, one to the ring,
and one to the sleeve. The tip and ring should be
wired to the two capacitors on the headphone
jack assembly (connections 1 and 2 in Figure
B
).
The sleeve should be wired to the rectangular pad
shown as connection 3.
7. CONNECT THE LOCK SWITCH
I decided to use the iPod’s lock switch as a power
switch. There are two small pins on the bottom of
the switch. Wire one of them to the Enable pin on
the MiniBoost module, and the other to ground
(Figure
C
). When the switch is closed and the
Enable pin is pulled low, the boost module will
stop providing power to all components.
8. REATTACH THE HEADPHONE JACK
ASSEMBLY
Screw the assembly back into the case,
ensuring that the headphone jack and switch
are properly aligned.
You may have to snip out some of the plastic
to make space for your new audio wires.
9. CONNECT DISPLAY TO PI COMPOSITE
OUTPUT
On the Raspberry Pi, the two pins for composite
video are labeled TV. Connect these to the display
To ground
To MiniBoost “Enable”
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