CREATED BY
UJENIYA PUSHTI AND MANDVIYA JANKI

COMPONENT REQUIRED

1. breadboard
2. arduino uno
3. ultrasonic sensor HC-SR04
4. micro servo motor SG90 
5. bluetooth module HC-05
6. lcd display 16x2
7. led
8. 1.5Kohm resistors
9. connecting wires

In this project the ultrasonic sensor detects the distance of object. whenever the object comes in its range the servo motor rotates to nighty degree and closes the path for object to move ahead and show some specific message on the lcd display and red led gets turn on . With the help of bluetooth module whenever user types  some specific word  through terminal here in our case when user types  $ through the  terminal the servo motor rotates to again nighty degree towards up and this way it open the path to move ahead and that time a message is shown on the lcd display as well as  on the serial monitor and that red led gets turn off. this way the toll system  works  using all these sensors and arduino uno.

code file :
https://drive.google.com/file/d/1pOmvxzU30k2h-cyQJQ8jj6xfFbjH5Ab1/view?usp=drivesdk

circuit diagram file:
​https://drive.google.com/file/d/1pQBXpXxtreQidwK2T_ynFXmO_PX7WxLf/view?usp=drivesdk​​​