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5t4nd1ng @ th3 3dg3 0f 5p3ct4t10n!
Give a child a toy and they're happy for an hour.
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Have the students figure out the speed of the chip, the speed of the sensor, the round-trip time of flight from the UltraSonic to the target. They already know the distance from the sensor to the target as a reference. Looking up data sheets online and digging out the info and doing the math makes for a middle-school level of research (reverse enginnering.)
Then have them alter their programs to use constants for the sensor.
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