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My IoT device, BusAlert, has one knock sensor and 3 LED with different colors. Once the sensor is triggered, the light will lit up according to the estimated arrival time of a certain bus - in my case, it's the number 54 bus. For example, if the bus is more than 10 minutes away, the Green LED will light up; if less than 10 minutes but more than 5, the Blue will light up; if less than 5 minutes but more than 3 minutes, the Red; if less than 3 minutes, the Red will blink. 

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