The coaster uses a TMP006 infrared temperature sensor which measures the temperature of whatever you place on the coaster indirectly. It also doesn’t use much power.

According to [Dr. Tom Lehrer’s] song Pollution, “Wear a gas mask and a veil. Then you can breathe, long as you don’t inhale!” While the air quality in most of the world hasn… ...

New TCS3701 enables front-facing ambient light and proximity sensing measurements in smartphones – maximizing edge-to-edge display screen size – with sensor operation under OLED display ...