■ FIGURE 9.
■ FIGURE 8. A few parts are through-hole and are
mounted on the encoder side of the board.
experimenter-friendly Dual In-Line (DIP) package. It is only
available as a surface-mount device (SMD). SMD
components are surprisingly easy to work with, and this
package form should not deter you from building this
project. An excellent tutorial on SMD soldering can be
www.eevblog.com, episode #186. (Warning: Try
not to get too distracted by all the other interesting
electronics videos on Dave’s site until you have finished
I was able to make a single-sided PCB using the Press
‘n Peel Toner Transfer system for the prototype. Due to its
simplicity, the device could easily be constructed using
perf-board techniques. Figure 7 and Figure 8 show how I
used the box described in the Parts List to build the
Begin assembly by soldering the AT90USB162 chip
(make sure pin 1 is correctly oriented before soldering).
Next, solder the SMD resistors and capacitors, crystal,
encoder, reset pushbutton, and status LED.
Finally, feed the USB cable through a hole in the side
of the box and then through the hole in the PCB that acts
as a cable strain relief. Solder the cable wires to the board
making sure that the color coded wires attach to the
correct pads. Soldering mistakes or shorts could damage
your USB port. I used a cable salvaged from an old USB
mouse, but you can purchase an open ended cable for
this purpose (see Parts List). Don’t close up the
box just yet. You will need to access the reset
pushbutton to program the device.
■ FIGURE 10.
Download the project files from the article
link. Save the files on your hard drive in a folder
called UsbMediaControl. Next, install the software
to program the device. To do this, download and
install the FLIP software from Atmel’s website
www.atmel.com). I recommend that you install
the version that includes the Java runtime to avoid
any compatibility issues.
Once FLIP is successfully installed, attach the
device’s USB cable to a USB port on your
computer and place the device in DFU mode by
performing this sequence:
1. Press and hold the reset button.
2. Press and hold the mute button