The last Pixel models to have a Hall sensor were the Pixel 2 and Pixel 2 XL from 2017. But Esper’s Mishaal Rahman disseminated a tweet in which he states that debug documentation includes a reference to a Hall sensor for the Pixel 7 series. If the upcoming Pixel 7 and Pixel 7 Pro do ship with a Hall sensor, it would be a sign that Google could include a flip cover as an accessory for the upcoming 2022 flagship Pixel models.
A magnet’s presence and magnetic force can be determined using a Hall sensor. Manufacturers of mobile devices install this sensor on devices that are anticipated to have magnetic flip covers. The phone’s sensor detects a strong magnetic field when the case is closed, which triggers the display to turn on. The screen illuminates if the sensor detects a weaker or nonexistent magnetic field (which occurs when the flip cover is open). The screen is turned off when the flip cover is closed because of the greater magnetic field.
Android Police notes that the just-released Pixel 6a could have a Hall sensor too since the handset’s software includes drivers for it. So far, though, there are no signs of the sensor in the new Pixel mid-ranger.