Ask while they play

Point to the sensor. What did your hand do to the number? What did the flashlight do?

Spot it at home

• Phone screens that dim in the dark, streetlights that switch on at dusk, solar garden lights that come on at night.

How does the streetlight know it's night?

How it helps a robot

• The mBlock app calls the light sensor a light sensor.

Talk about it later

Where would a light sensor be useful in our house?