Level 4 done! You built the robot's Brain.

12shoutlisten

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  1. 1. Line sensors
  2. 2. Brain chip

Your robot's three sensors

123shoutlisten

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1Light sensor

On top. It notices light: is it bright or dark?

2Line sensors

Underneath the nose, looking down. They are light sensors too. Each one shines its own tiny light at the floor and checks how much bounces back. A dark line bounces back less.

3Echo sensor

At the front. It looks like two eyes, but one side shouts a tiny click and the other listens for the echo.

Can you remember?

The rule says: if darker than 30, lamp on. The sensor reads 20. What happens?