Create a Smart Doorbell using Ultrasonic Sensor and ESP8266 with LED and Buzzer that will send a notification on Blynk app. Provide the code and steps to build the model.

We need user testing for the UI design of the Will 4Live mobile app that a group of students is developing for charity. Just for the lab!

!!!EXPLAIN HOW IT WORKS WITHIN THE CODE WITH COMMENTS!!! The idea of ​​the Project is to use the PIR sensor in combination with the HC-SR04 ultrasound sensor, a servo motor, three LEDs (red, yellow, green), an LCD and a buzzer. The final project must simulate an entrance and exit system of an urbanization that can grant access when the PIR detects a person. And meet the following conditions: 1) The mechanical arm must be simulated with a servo motor (when it is down, 0 ﹾ, the red led must be on). This must go up when placing a hand on the PIR sensor (during the raising of the arm the yellow led must be turning on and off).2) Simultaneously when the mechanical arm is activated, an audible alarm must also be activated (buzzer at the rate of the yellow led) and when the arm is fully up (90 ﹾ) the green light must be turned on (the only LED on at that moment).3) The ultrasound sensor will detect an object that interferes with the normal return of the arm to its initial position and will…

In order to define the user interface design for the mobile app that will be used by will 4 live, we will need to test a prototype. Just for the users, the testing?