The main task of the task is the detecting and sensing the object like  hand make the dustbin to open and close by using the ultrasonic sensor  and servo motor. Ultrasonic sensor is used to sense the object (hand) by  sensing the distance from that sensor. Ultrasonic sensor has four pins,  they are input 5V power supply, ground, trig pin, echo pin. Trig pin is  taken as input and echo pin taken as output. Servo motor is used to rotate  the motor step by step by setting the angle to the motor. Servo motor has  three pins, they are 5V pin and ground pin. 

By making the connections 

As per the circuit, by connecting ultrasonic sensor, servo motor. By using  arduino program gives the result of sensing the hand using the sensor  and make the servo motor rotate to open the lid of the dustbin. The  sensor senses the object, if the distance is less than the certain distance  and motor rules the open and close of the lid. The distance is calculated  using formula 

✔ Speed of sound = v = 0.034cm/us 

✔ Time = distance / speed 

✔ t = s / v = 10 / 0.034 = 294us 

✔ Distance = t * 0.034 / 2 

The instruction is sent to the blynk app with the help of the Wi-Fi  module. By using this app we can get the information about the state of  the dustbin.