Predator Clock

If you like science fiction then you definitely must have seen the Predator movie. How about having some of that high tech gadgets that actually works. What can be cooler than to have your own predator wrist watch that when pressed all the buttons would start the count down with all the sound effects. Or just having it laying it around showing the time on some distant planet.


The idea is to make clock that can be light enough to be worn on wrist. In addition it will have build in functions that would be controled by Atmel Tiny (a cheap micro controller) and shift registers to lit the 36 LEDs. The are two major components that have to design. First, the physical watch housing that resemble the predator watch like in the movie. Second the electronics components that would mimic the symbols of the of the Predator's numbers.

Previous work:
Original gauntlet

These components will further subdivide into the control unit, input buttons, and five segments with nine LED on each. The control unit will house all the shift registers, micro controller, and resistors. Then each LED segment would be wired to the control unit.

Clock Housing:

[Under Development]


  • Regular 2400 clock
  • Progress bar
  • Count-up/Count-down (human)
  • Whatever is in the film (dividing by 2 or some factor to give an about 20 second count down)



  • Atmel uC
  • crystal
  • Caps
  • Resistors
  • Shift Registers (M74HC595B1)
  • Piezo Electric Speaker


  • 9*5 leds+Resistors

Power Module

Bill of Materials

Power Module
  • 7805 regulator IC 
  • 100 uF electrolytic capacitor, at least 25V voltage rating 
  • 10 uF electrolytic capacitor, at least 6V voltage rating 
  • 100 nF ceramic or polyester capacitor
  • 4 AA battery holder 
Controller Board
  • Headers
    • 3x2 pin for programming port
    • Barrel connector for DC power 5V
    • 4 AAA battery holder 
  • Switch to select battery or wall power SPDT ( not found yet ) 
  • Atmega 328P ( ATMEGA328P-PU-ND )
  • 3 100nF Ceramic capacitors
  • 22 pF Ceramic capactitors
  • 16mhz Quartz oscillator 
  • Microswitch for reset other purposes.
Capacitor sources:
Asia Engineer:We at least need 1, and technically we should use 2) for the power. We will need them for other power circuits as well. 3 is an assortment for the future. I think I have 2) here or we can get them off of other boards.

Digikey items:
Battery holder:
Microswitch: get at least 2, but maybe we can use them in the design to add more switches?
.33 uF Capacitors For Power Supply: get at least 3
7805 Voltage Supply regulator 9vdc to 5vdc:
For music: (We can use the TLC5940 for more than just music. It can be used to provide many more pwm outputs for the arduino for dc motors. It can handle much more current than shift registers and can manage brightness for leds.)
Not good:
Voltage doubler:

What is AREF?
How does one mathematically derive the capacitor values for decoupling?
What pins should we use to control the shift registers? We need 5.
What pins should we use to power the speaker?
Add switches.
Add two power sources.
Add programming header.
Multitone Piezo.
Switches requirements we need?

Multi-tone Piezo
Battery monitor

Capacitive Touch Sensor Reqs (for next gen)
Battery charger

Rev. 2:
- Add IC for charging along with arduino-like power source auto-selection:
- Add capacitive touch sensors
- Add slider control
- Add multi-tone piezo