The Karan-Yiil is a dedicated near-infrared (NIR) observation unit, “removing” the limitations of human vision to see in total darkness.

When paired with the NightHawk (IR Flashlight), the Karan-Yiil can see through certain plastics, peer deep into foliage, and turn the pitch-black night into a high-contrast midday scene. Think of this as premium nightvision on the budget.

Standard cameras block infrared light to mimic human vision. For this project, you must use a NoIR (No Infrared) sensor. These sensors are wide-open to the 850nm-940nm spectrum, allowing your flashlight to act like a massive invisible floodlight.

Depending on your choice above, the “surgery” varies:

• RPi HQ Camera: Requires removing the internal IR-cut filter (the two-screw method).
• NoIR Modules: No surgery required! These are sold “pre-blinded” to visible-only light.
• Note: For the clearest IR images, you may want to add an IR-Pass filter (850nm) to block visible light, ensuring the camera *only* sees the infrared “ghost” world.

Total Est. Cost per Unit: ~$82 – $172 CAD.
(Low end uses Arducam NoIR; High end uses RPi HQ + Lens.)
(~$52 – $142 if using a Phone as the Viewfinder – No LCD needed.)
(~$30 – $120 if you already have a spare RPi Zero.)

The IR world doesn't just look “green” (like old movies)–it looks like a surreal, snowy wonderland.

• The Wood Effect: Healthy green leaves reflect IR light so strongly they appear glowing white. Landscapes will look like they are covered in fresh snow.
• The “Clear” Soda Trick: Point the Karan-Yiil at a bottle of Coca-Cola. The liquid will appear almost completely clear, like water, because the dyes don't absorb IR light.
• Synthetic Fabrics: Many “black” polyester or nylon clothes will appear bright white or grey. This is because they are dyed to block visible light, but are highly reflective to IR.
• The Veins of the Hand: Because NIR light (850nm) penetrates slightly into the skin, you can often see the dark “roads” of your veins through the Karan-Yiil.

[ SYSTEM ARCHITECTURE: THE KARAN-YIIL ]

      [ NIGHTHAWK (IR THROW) ] ----> [ TARGET ] 
                                     |
                                     | (Reflected IR Light)
                                     |
      [ IR-PASS FILTER ] <-----------/
            | (850nm+ Only)
            v
      [ CAMERA LENS ] 
            |
            v
      [ NO-IR SENSOR ] (Either native NoIR or Modified HQ)
            |
            v
      [ RPi ZERO 2W ] ----> [ WIFI ] ----> [ SMARTPHONE ]
                           (OR)
                      ----> [ TFT LCD ]

• The Spectrum: This spectrum is considered “Near-IR” (NIR) – conversely, “Far-IR” (FIR) is thermal energy as in a thermal camera or heat radiating off an object.
• Daylight Use: The NightHawk is primarily for indoor or nocturnal use. During the day, the sun provides high ambient NIR levels, making an external flashlight less a requirement.
• The Stealth Effect: To the human eye, the NightHawk looks like a faint, dim red glow (the “red drop” effect), but on the Karan-Yiil screen, it looks like a high-powered searchlight.
• Focus Shifting: IR light focuses at a different point than visible light. Many vintage lenses have a small “red dot” or “R” on the focus scale–use that for IR!
• Green vs Grey - Traditional nightvision systems choose green due to high sensitivity of the eye there - it peaks at ~555nm! On a modern display, this is less necessary.

Caw! Ready to see what the night is hiding?