Remember: A sensor tells a robot about the world, so its program can react. A color sensor tells colors apart and a touch sensor feels a push.
Read and answer
Read the story, then answer.
The robot fairAt the school robot fair, Priya's robot Bo had to follow a blue road across a mat, with a yellow tile at the end. Her rule was: follow the road, and if the floor is yellow, stop. But Bo rolled right over the yellow tile, because he could not tell yellow from blue. Ms. Okoro said a program can only use what its robot can sense, and she clipped a color sensor under Bo's belly and a touch sensor on his front. A color sensor shines a little light down and measures what bounces back. A touch sensor is a little button that clicks when something pushes it. This time Bo stopped on the yellow tile. At the wall, click! Bo backed away, turned and rolled on.
1
Why did Bo roll over the yellow tile the first time?
👁️He had no sensor to tell yellow from blue📏The tile was too small💾Priya forgot the program
2
A program can use something its robot cannot sense.
TrueFalse
3
A color sensor shines a little light down and measures what bounces .
awayupback
4
Which sensor would let Bo notice the wall?
🎨A color sensor🔘A touch sensor🚫No sensor is needed
5
Bo's front bumps the wall, and the touch sensor clicks. What does Bo do with this program?
He rolls onHe backs upHe stops for good
6
Yellow and blue bounce light back in the same way.
TrueFalse
Sensors, order and fix
7
Join each word to what it does.
1a color sensor
2a touch sensor
3a sensor
4an if in the program
Auses a sensor's answer to react
Bclicks when something pushes it
Ctells a robot about the world
Dtells colors apart
8
Circle every job that needs a color sensor.
🟡stopping on a yellow tile↩️backing up when the bumper is pushed🟥sorting red blocks from blue blocks🔘feeling a button being pressed
9
Bo must notice a loud clap. Which sensor does the job?
🎨A color sensor🔘A touch sensor👏Neither, because it needs a sound sensor
10
Put Bo's second run in order.
Bo stops on the tile
The if is true
The color sensor says yellow
Bo follows the blue road
11
Priya's rule says: if the floor is yellow, stop. Bo has only a touch sensor. What is the mix-up to fix?
Add a color sensor, because a touch sensor cannot tell colors apartPaint the tile blueMake Bo roll faster
12
Priya wants Bo to stop on the yellow tile and to back away from the wall. How many different kinds of sensor does Bo need?
123
13
Draw Bo with his two sensors. Label the color sensor and the touch sensor.
Scan the code at the top to mark this sheet on screenTake a photo of your answers or type them. It is marked for you automatically, and your score is kept.
Answer key · Set A
Bo gets two sensors
1He had no sensor to tell yellow from blue A program can only use what its robot can sense, and Bo could sense nothing yet.
2False Bo only does what he can sense.
3back Yellow bounces back differently from blue, so the sensor can tell them apart.
4A touch sensor A touch sensor is a little button on the front that clicks when something pushes it.
5He backs up The program asks whether the button is pressed, and if it is, Bo backs up.
6False Yellow bounces back differently from blue, which is how the color sensor tells them apart.
71-D, 2-B, 3-C, 4-A Sensors give a robot information, and the program uses an if to react.
8stopping on a yellow tile, sorting red blocks from blue blocks Stopping on yellow and sorting colors need a color sensor. A bumper push and a button press need a touch sensor.
9Neither, because it needs a sound sensor Hearing a sound needs a sound sensor, not a color or touch sensor.
104, 3, 2, 1 The sensor reports yellow, so the if is true and Bo does the then part.
11Add a color sensor, because a touch sensor cannot tell colors apart A touch sensor feels pushes. A color sensor tells colors apart.
122 Yellow needs a color sensor and the wall needs a touch sensor, so 2 kinds.
Mark each answer, count the right ones and write the score on the sheet.