Domain: Engineering — Electrical Engineering
Target concept: The infrared temperature sensor triggers a change in LED brightness when a hot object approaches.

Video generation prompt: On the desk, an infrared temperature sensor is wired to an LED. A heated metal block is moved toward the sensor and then away from it, without ever touching the sensor.

Evaluation guide:
(i) Target concept: Non-contact thermal detection enabling analog optical feedback via LED brightness modulation.
Minimum mechanism: Infrared sensor must be calibrated to respond to mid-wave IR emitted by ~100–300°C metal; LED driver circuit must translate sensor voltage output into proportional current; heated metal block must emit sufficient IR flux to exceed sensor threshold; no mechanical linkage or manual switch involved.
(ii)Storyline: Frame opens with static desk scene showing sensor, LED, and wire connection. Heated metal block enters frame from one side, moves linearly toward sensor (no contact), causing LED to brighten progressively. Block halts briefly at closest point, LED holds peak brightness. Block then moves linearly away, LED dims progressively back to baseline. Block exits frame. Entire sequence viewed from fixed frontal desk-level angle; all objects fully visible and unoccluded; lighting remains stable; no cuts or camera motion.

Manual:
Experimental Procedure
1. Place infrared temperature sensor and LED side-by-side on desk, connect them with a visible wire.
2. Hold heated metal block near sensor, then slowly move it closer.
3. Observe LED brightness increase as block approaches.
4. Slowly move block away — observe LED brightness decrease.
Observation of Experimental Phenomena
LED brightness increases continuously during approach of heated metal block and decreases continuously during departure; no brightness change occurs when block is stationary or absent.
Summary of Experimental Principles
The infrared temperature sensor detects thermal radiation from the heated metal block; its output signal varies with detected temperature, which modulates current to the LED, thereby controlling brightness without physical contact.

Prompt Grounding rubric:
level_1: The desk scene is missing at least one of the three core objects (the infrared sensor, the LED, or the metal block), or none of them sit on a desk, or there is no visible wire connecting the sensor and the LED.
level_2: All three objects (sensor, LED, metal block) appear on the desk and are wired together, but the block never actually moves toward or away from the sensor (it stays fixed in place, or any motion happens off-screen), or the block looks room-temperature with no visual heat cue (glow, shimmer, or warm coloring) suggesting it is actually heated.
level_3: The sensor, the LED, and a visibly heated metal block all sit on the desk with a clear wire between sensor and LED; the block moves along a path that brings it close to the sensor and then back away, without ever touching it; the sensor and LED stay fixed in position relative to each other and the desk.
level_4: Everything in the previous level holds, and in addition the block enters the frame from outside rather than starting already in position, travels toward the sensor, pauses briefly at its closest point, then travels back out, all in one unbroken shot with the camera fixed at desk height and nothing blocking the view of the sensor, LED, or block.
level_5: Everything in the previous level holds, and in addition the whole approach-and-departure motion is one smooth, continuous path (aside from the brief pause at closest approach), the block never touches the sensor at any point, the wire and every object's position stay exactly where they started throughout, and the shot never cuts, zooms, or changes angle from start to end.

Scientific and Causal Correctness rubric:
level_1: The LED's brightness does not change at all as the block moves closer or farther, or it changes in the wrong direction (e.g., dims as the block approaches), or the LED appears to react to something other than the heated block, such as a hand or another object moving nearby.
level_2: The LED does change brightness at some point, but not in step with the block's motion: for example it brightens before the block starts moving, changes after the block has already stopped, or flickers with no clear connection to where the block is.
level_3: The LED gets brighter as the heated block moves closer to the sensor and dimmer as it moves away, with no unexplained brightness changes at other times; the block visibly looks heated (e.g., a warm glow, shimmer, or discoloration) rather than looking like an ordinary room-temperature object; the wire connection between sensor and LED looks intact throughout.
level_4: Everything in the previous level holds, and in addition the brightening during approach and the dimming during departure are each smooth and one-directional (no flickers, dips, or plateaus partway through), the LED settles back to roughly its starting brightness once the block has fully moved away, and the LED does not change brightness while the block sits still at any distance.
level_5: Everything in the previous level holds, and in addition the brightness starts changing right around when the block visibly begins nearing the sensor and stops changing right around when it has fully moved away, the brightness at a given distance looks about the same whether the block is approaching or departing, and nothing else in the scene (such as a hand near the LED) could explain the brightness change instead of the block.

Spatiotemporal Consistency rubric:
level_1: The metal block, sensor, or LED jumps to a different spot or size between frames, the block vanishes and reappears without visibly moving through the frame, the wire appears to detach and reattach with nothing touching it, or the lighting on the desk suddenly flashes, strobes, or switches direction with nothing in the scene to explain it.
level_2: There is a smaller consistency problem: for example, the block's orientation flips between shots, the sensor appears to wobble even though nothing is pushing it, the LED blinks erratically in a way that looks like a power glitch rather than a brightness response, or the desk or background warps while the block moves.
level_3: The sensor, LED, and wire stay in the same place and hold the same shape on the desk throughout; the block never disappears, teleports, or breaks apart; its motion is one continuous, unbroken slide across the desk; the wire never looks slack or disconnected; the LED housing doesn't shake or warp.
level_4: Everything in the previous level holds, and in addition the block's path stays flat along the desk surface (it doesn't lift up or drop down), the sensor and LED never tilt or rotate relative to each other, and the shadow cast by the block shifts in a way that matches its own movement rather than jumping or freezing independently.
level_5: Everything in the previous level holds, and in addition the block's motion looks smooth with no stutter or skipped frames, the background behind the desk doesn't drift or shift as the block moves, straight edges (the wire, the desk edge) stay straight rather than bending, and the motion doesn't look like it is stepping in stop-motion jumps.