You are asked to build a smart traffic intersection controller using an ESP$32-$S$3,$ sensors$,$ and

actuators. The system controls an intersection between two one$-$way roads and a train track using

two traffic lights as shown below:

B

A

Term $241$ Louai Al$-$Awami $16-09-2024$

COE $515$ Intro. to Smart Systems $2$

When there is no train passing through the intersection, the two traffic lights take turns switching

between green and red as usual. Only one traffic light should be green at any given time. The ratio

of time duration of the green light at every intersection can be set using a potentiometer, where

each traffic light can take a duration in the interval $[10,20]$ seconds. The total duration both lights

are green is $30$s$.$ Before turning red from green, the orange light should be on for $3$ seconds after

the green duration is completed.

When a train approaches the intersection, both traffic lights stay red from $15$ seconds. A special

warning light also starts flashing $($use the built$-$in LED$).$ Use a push button to simulate the train

approaching the intersection. Also use a buzzer to simulate train sound J$.$

Bonus: Generate a changing train sound $($buzzer$)$ and flashlight $($built$-$in LED$)$using PWM$.$