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Level：★☆☆☆☆
Motion sensor is used to detect if there are people moving in the playground, if there are, the LED light will be turned on; otherwise, it will be turned off.

Level：★★☆☆☆
The micr:bit will check if there are any vacancies in the car park. If there are any cars entering the car park, (eg. The distance sensor return value <5). Then, the servo will control the car park gate to be opened; otherwise, the gate will keep closing.

等級：★☆☆☆☆
運動傳感器用於檢測操場上是否有人在移動，如果有，LED燈將亮起；否則，它將被關閉。