SOURCE: PATRICK M. O'CONNELL, CHICAGO TRIBUNE

Lane Tech College Prep High School students, in collaboration with the University of Chicago, will be installing sensor boxes at Wrigley Field to measure sound levels, customer satisfaction and air quality, among other things. (Jose M. Osorio / Chicago Tribune)

When Cubs fans leave Wrigley Field starting Tuesday night, they may encounter a simple console with two circular buttons: one a red, angry face, the other a green, smiley face. The sensor will have a question attached asking fans about their experience at the ballpark and whether they would recommend a Wrigley visit to their family and friends.

But it won’t be Cubs executives on the other end monitoring the responses. Rather, each push of a button will be recorded and registered on the computers of Lane Tech High School students.