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Learn how machines sense the world and make changes—the eyes and hands of any control system
Preview · progress not saved — Chapter 1 is free
Educational content slides
Sensors convert the physical world into numbers.
Thermometer: Temperature → voltage → °F reading
Microphone: Sound waves → electrical signal → digital audio
Camera: Light → electrical charge → pixel values
Your phone has 15+ sensors: accelerometer, gyroscope, GPS, light sensor, proximity sensor, compass, barometer. Without sensors, it's just a brick.
Test your understanding with this quiz.
A smartwatch tracks your heart rate during exercise. What sensor type is it using?
Complete this exercise and get AI-powered feedback.
Every breakthrough device added a sensor nobody else thought to use.
What's missing from the devices around you?