Dear Federal Agents and other Law Enforcement:
This is only a clock. It is no more dangerous than any other clock. I
don't know anything about explosives beyond what I've seen in movies.
So, if you are with the FBI, Department of Homeland Security, CIA, ATF,
Department of Defense, National Counterterrorism Center, Interpol, or
SEAL Team Six, please know that I am on your side!
So, we're cool, right?
Yeah, you. I know you are excited to scare your friends and coworkers
with a phony bomb, but use your head. This kind of device can make
people freak out and call the authorities. So don't bring this to
school or to work, and certainly don't bring it anywhere near an airport! Seriously, don't get yourself into trouble.
Functions as an ordinary alarm clock with snooze alarm and two alarm modes (normal beeping, and countdown sequence).
no battery backup, but the current time is always preserved in
non-volatile EEPROM memory, so you don't have to reset the time after a
brief power interruption or if you move the clock from one place to
another. Alarm time and mode are also preserved in EEPROM.
When you press the big red button, the detonation countdown sequence
starts. You've got 10 seconds to cut the correct wire or the clock
"explodes" with flashing red LEDs. (You can set the countdown sequence
to higher values -- see detailed usage below.)
The wires are held with screw terminals so they are easily replaced. If
you don't want to actually cut the wires, you can leave the screws a
bit loose and pull the wires out instead.
Requires a common 9V DC power adapter with a 2.1mm center-positive plug.
The adapter should be rated for at least 200mA. This is also
available in the nootropic design store.
The clock can also be powered by batteries. Six AA, C or D cell
batteries can be used to provide 9V. C or D cells will provide the
longest life. The clock draws about 90mA of current.
The Defusable Clock is completely hackable. It is powered by an
ATmega328 microcontroller with the Arduino bootloader, so you can easily
reprogram it to your liking. The software is all open source!
Setting the Time
To set the time, simply press the HOUR and MIN buttons. You can hold
the buttons to make the numbers advance automatically. When setting the
hour, the LED marked PM will indicate that the hour is PM. (The PM LED
is only lit when setting the time and alarm because it is quite bright
Setting the Alarm
Hold down the ALARM button (lower left corner of board), then use the
HOUR and MIN buttons to set the alarm time. The LED marked PM indicates
if the alarm time is PM.
There are 3 alarm modes, OFF, ON, and DEFUSE. To cycle through the
alarm modes, hold the ALARM button, then press the large red DET button.
Two LEDs indicate which mode the alarm is in. One LED is near the
ALARM button, the other is near the large red DET button.
|LED indicators||alarm behavior|
|alarm OFF||alarm LED off, DET LED off||alarm is off|
|alarm ON (normal mode)||alarm LED on, DET LED off||alarm will beep|
|alarm ON (defuse mode)||alarm LED on, DET LED on||alarm will beep a few times, then 10 second countdown sequence begins|
Turning off the Ringing Alarm
When the alarm is beeping (normal mode), turn the alarm off by pressing the alarm button.
For snooze, press the red DET button. Alarm will ring again in 9 minutes.
If you are using the "defuse" alarm mode, you can try to defuse the
clock by cutting the right wire. Otherwise, the 10 second countdown
will reach 0 and the device will "detonate".
Starting the Countdown Sequence
Press the red DET button to start a 10 second countdown sequence. If
you want the countdown length to be longer, press the HOUR and MIN
buttons before releasing the DET button. You can set the countdown to
be up to 99 minutes and 59 seconds.
During the countdown, choose the correct wire to defuse the device. One
wire stops the countdown safely, two have no effect, and one will cause
the device to detonate immediately. The role of each wire is assigned
randomly each time the DET button is pressed.