Motion Sensors in 7 Days to Die can set up some complex systems, from running automated security cameras to controlling turrets for base defense.

Google Nest Protect: $119 CO2 sensor What it measures: These use infrared sensors that measure light in the air, because this is inversely proportional to the amount of CO2.

First, we'll connect our traffic light sensor to a generic breakout shield we have installed on our Arduino UNO: breakout shields are shields containing banks of analog and digital pins, GND pins ...

ONVIS Smart Sensor at $26 – A simpler and more affordable way to add temp and humidity monitoring in the Home app. This also includes a motion sensor.