# Motion ## Types of Motion Sensors ### **Passive InfraRed (PIR) Motion Sensor** Passive infrared sensor is an electronic sensor that measures infrared light radiating from objects in its field of view. For differences between PIR and mmWave, check out [[Passive InfraRed (PIR) vs. MMWave]]. #### Aqara Motion Sensor (Zigbee) Cheap [[Zigbee]] Option: - [Aqara-Sensor de Movimento Inteligente, Sensores do Corpo Humano, Movimento Corporal, PIR, Wi-Fi, Conexão ZigBee, Aqara Hub, Xiaomi Home App - AliExpress 44](https://www.aliexpress.us/item/3256804558138745.html?aff_fcid=fac80e1bd44f41f7a88ebb4f7fae6ae0-1726336925718-01504-_Dedio7B&tt=CPS_NORMAL&aff_fsk=_Dedio7B&aff_platform=shareComponent-detail&sk=_Dedio7B&aff_trace_key=fac80e1bd44f41f7a88ebb4f7fae6ae0-1726336925718-01504-_Dedio7B&terminal_id=3e10b64d312142f1b6eae0baf50c5cf4&afSmartRedirect=y&gatewayAdapt=glo2usa4itemAdapt) ### mmWave Motion Sensors Work by emitting electromagnetic waves that bounce off objects and return to the sensor. The sensor can then analyze the reflected signals to determine the presence, distance, speed, and angle of objects # Temperature / humidity - [https://www.getzooz.com/zooz-zse44-temperature-humidity-xs-sensor/](https://www.getzooz.com/zooz-zse44-temperature-humidity-xs-sensor/) - These are temperature sensors that I have in each room. The bathroom exhaust fan mentioned earlier is controlled by one of these in the bathroom. Once the humidity goes above x, then turn the fan on. When humidity falls below x, turn off. The temperature part currently is just used to record temperature changes, not really anything automated currently. # Open/close Door / Window sensors # Water Leak # Smoke / Carbon detector - [First Alert Z-Wave Smoke/Carbon Detector.](https://www.firstalertstore.com/store/products/z-wave-smoke-and-carbon-monoxide-alarm-zcombo-g.htm)  - These are great and integrate directly into Home Assistant. I have a few automations, mainly notifications, setup if they do go off. # Electrical Usage - [Emporia Vue 2.](https://shop.emporiaenergy.com/products/gen-2-emporia-vue-with-16-sensors-bundle)  - This thing is extremely affordable and monitors every circuit in your electrical box. We installed a new 20a line to a room for a space heater and I can track how much electricity this actually uses whenever we heat the room up. # Weather - [Ecowitt.](https://shop.ecowitt.com/)  - I use Ecowitt with their hub for a weather station and soil sensors. They are both amazing devices and work exactly as epected. I use the weather station for automations and plan to incorporate it a bit more as we move into gardening season. # Soil # Bathroom Exhaust Relay - [Zooz ZEN52.](https://www.getzooz.com/zooz-zen52-double-relay/) - I have one of these in my bathroom exhaust fan. I don’t need manual control of the fan, as it should always be automatically on/off, so I repurposed the bathroom bottom switch to control the light instead of the fan. Luckily this thing is small and fits right into the exhaust fan box.