Code 13 The Accelerometer

Which statement best describes an accelerometer in computing devices?

• A sensor that measures only light intensity

• A simple device that outputs a single constant value

• A sensor that measures several kinds of motion to detect movement and position

• A component used only for audio output

Which motions correspond to pitch, roll, and inclination when measuring orientation?

• Pitch: side to side; Roll: forward/back; Inclination: vertical up/down

• Pitch: rotational; Roll: forward/back; Inclination: side to side

• Pitch: forward and back; Roll: side to side; Inclination: rotational

• Pitch: rotational; Roll: side to side; Inclination: forward/back

What are the typical value ranges returned for pitch and roll by the orientation sensor?

• Pitch −180 to 180, Roll −90 to 90

• Pitch −90 to 90, Roll −90 to 90

• Pitch 0 to 100, Roll 0 to 360

• Pitch −360 to 360, Roll −180 to 180

Which orientation measurement has a different numeric range than the others?

• Pitch

• Roll

• Inclination

• All have the same range

In programming with the Circuit Playground, which block returns the current orientation values?

• accelerometer.getSpeed()

• accelerometer.getOrientation()

• sensors.readTilt()

• motion.readAxis()

According to the material, when the board is tilted back, how is the pitch value expected to behave?

• It becomes positive

• It becomes negative

• It stays at zero

• It alternates between −90 and 90

Which is a common real‑world use of accelerometers mentioned in the material?

• Improving screen brightness on laptops

• Tracking steps with pedometers

• Enhancing Wi‑Fi signal strength

• Controlling speaker volume

A program needs to detect rotational motion around the device’s center. Which orientation value should it read?

• Pitch, range −90 to 90

• Roll, range −90 to 90

• Inclination, range −180 to 180

• Any of the three; all measure the same motion

Which accelerometer event fires every 100ms to check for updated data from the sensor?

• data

• change

• shake

• update

What condition causes the accelerometer's change event to trigger?

• Whenever the device is powered on

• When current data differs from data 100ms ago

• Only when the board is shaken

• At random intervals