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AI Explorers 6-8 / Week 02 / Friday
5/6
Week 02 · Sensors and Perception

Friday

Machines that see and hear
// From raw signals to meaning
⏱ about 20 min

Friday: Machines That See and Hear

After the plan is sent, the crew takes a break in the station kitchen. Rocket notices a small light blinking on the wall.

"That is a motion sensor," Raven says. "It turns the lights on when someone walks in."

Rocket looks around the room. "There are sensors everywhere once you start looking."

Nova bobs near the ceiling. "Some just switch things on and off," she says. "Others feed signals into systems that try to perceive meaning."

"And people decide which is which," Raven adds, "and what happens with the data."

Sensors everywhere

Many everyday devices have sensors. A light that switches on with a motion sensor can follow one fixed rule.

Some systems go further and try to perceive meaning, such as recognizing which object a camera is pointed at.

Making computers see and hear well enough to be useful is one of AI's most significant achievements so far.

Sensors can also collect information about people, so people need to decide carefully what to collect and who sees it.

FIXED RULE OR PERCEPTION?
  • Read the question.
  • Tap your answer.
Imagine a light that switches on whenever a motion sensor detects movement.
Imagine a system that hears a sound and predicts which word was spoken.
Imagine a sorter that looks at a snapshot and predicts it shows a comet.

Safe habits for explorers

Some devices with cameras or microphones may record you. Ask a grown-up what a device collects.

Never type personal information into any app or website, and ask a grown-up before using any AI tool.

If something online is upsetting or asks for secrets, stop and tell a trusted adult.

Week reviewTrue or false?
Computers perceive the world using sensors.?
Perception is getting meaning from sensory signals.?
A camera is software.?
Making computers see and hear well is one of AI's most significant achievements so far.?
Real AI perceives the world exactly the way people do.?
WHY THIS EXERCISESensors, signals and perception are the input side of every system you will design in this course.
OUR WEEK, IN ORDER
  • ?We wrote a sensor plan for Sky Sorter.
  • ?We followed a signal all the way to meaning.
  • ?We found the sensor behind every snapshot card.
  • ?We passed cards as signals in the relay lab.
  • ?We spotted sensors in everyday life.
WHY THIS EXERCISEEach day added one link to the chain from sky to label.
What does a motion sensor detect? Type one word.
WHY THIS EXERCISEEvery sensor detects one kind of signal, and its name often tells you which.
Sensors collect ____, and perception finds their meaning.
Before a device records you, ask a ____.
Try it
List five devices at home or school that have a sensor.
For each one, write fixed rule or perception, and the signal it detects.
On paper, draw the path from a star to a label: telescope, camera, software, Sky Sorter and a person checking.

Great week, explorer. Tomorrow's Explorer Quest turns your family into sensors.

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