Step 1: Requirements
- The design must not limit the functionality of the peephole. Thus, the device must be either transparent, or easily removable.
- It must not modify the peephole in any way.
- The design must be low powered, I don't want to have 50 watts of power pumping into my dorm room.
- And of course, since I am a poor college student, it must be low-cost.
Step 2: Parts
- Wall wart: I used a 3.3 volt wall wart to power the entire device.
- Wire: Some small gauge wire, preferably stranded for flexibility and durability.
- Resistor: A proper dropping resistor for the LED.
- Red LED: The most important part of the device, it needs to match the color of HAL's light. I managed to find an LED that matched the color of HAL's eye very well.
- Rubber Stopper: This holds the LED in place inside the peephole.
- Heat Shrink: I always use small gauge heat shrink to insulate the bare wires. You could always use electrical tape instead.
Step 3: Prepare the Rubber Stopper
Step 4: Solder Everything Together
Pull the rubber stopper down away from the work end. Solder the resistor directly to one of the legs of the LED.
Then, solder your cable to the LED and resistor.
On the other end of the cable, solder the wall wart cable to the power cable.
If the wall-wart you are using has a long enough cord, you don't need the cable. I needed the cable because I need to reach about 8 feet to the nearest plug...
Make sure everything is the correct polarity using a multimeter.
Step 5: Wrap It All Up
Once that is all done, push the stopper up to the base of the LED, so that it covers the resistor.
Step 6: Place in the Peephole
Make sure to unplug HAL if it starts to think on its own.
Also, I take no responsibility if HAL begins to disable life support in your room, or if it locks you out, and you have to brave the vacuum of the great outdoors to get inside