Robotics
Science FactA robot is a machine that can sense the world, decide what to do, and act. Engineers call this the Sense–Think–Act loop.
Sense
Sensors turn the world into signals a computer can read. Cameras see light, ultrasonic sensors bounce sound to measure distance (like bats), LiDAR bounces laser pulses, and gyroscopes sense tilt and rotation.
Think
A microcontroller or computer runs a program that decides what to do. Simple robots follow rules like 'if wall ahead, turn left'. Smarter robots use AI to recognize objects, but they still only know what they were trained on.
Act
Actuators make the robot move. Electric motors spin wheels, servos move joints to exact angles, and grippers pick things up. More motors mean more abilities, but also more weight and power use.
Getting around
Wheels are fast and efficient on flat floors. Treads (like tanks) grip rough ground. Legs can climb steps but are hard to balance. Engineers pick locomotion based on where the robot will go.
- Sense (sensors)
- Think (brain)
- Act (motors)
- World changes
- Sense again
COOL REAL FACTS
- NASA's Perseverance rover takes about 3 to 22 minutes to get commands from Earth, so it drives partly on its own.
- The word 'robot' comes from a 1920 Czech play and means 'forced labor'.
- Robot vacuums use bump sensors and cliff sensors so they don't fall down stairs.
SCIENCE FACT vs SCI-FI
Robots with real feelings or that think like people are still fiction. Today's robots follow programs and trained models.
TRY IT (SAFELY!)
Play 'human robot': one person gives exact commands (step forward 2, turn right) to guide a blindfolded friend to a target. You're programming!
REAL ENGINEER TIP
Engineers make a robot do one simple task reliably before adding more features.
PARTS THAT USE THIS IDEA
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