Lesson 30

Card 3.8: Cameras, Analog vs. USB

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Format: Compare + measure

Time: 40 min

Prerequisites: None

Core Question

An old-school analog camera and a modern USB camera can watch the same claw. One is blurry and instant; one is sharp and late. Which does a pilot actually want?

Resource (~10 min)

Both camera chains set up side by side: analog camera to a small screen, USB camera through the Pi to the topside display. Same scene.
The tradeoff vocabulary: resolution, latency, bandwidth down the tether, failure complexity (how many things must work for the picture to exist).

Activity

Measure latency for real: point each camera at a running stopwatch (phone timer with milliseconds) and photograph the camera’s display and the stopwatch in the same frame. The difference between the two readings is that chain’s latency. Three trials each, record the table. Then a two-minute manipulation test: a partner moves a target while you guide them using only each camera’s view.

Clearing This Card

The latency table plus a written recommendation: which camera goes on the claw and which surveys the scene, justified with your numbers. 90-second oral check: one challenge to your recommendation.

If You Miss This Class

Both chains stay assembled for two weeks; the stopwatch method works solo.

Why This Matters

Camera placement and selection is a classic DDR, and latency is the invisible variable teams forget until the pilot cannot grab anything. You now own the numbers.