What is the difference between Zigbee and Wi-Fi smart-home sensors?

Zigbee sensors use a low-power mesh that needs a hub or USB coordinator but sips battery and keeps data local; Wi-Fi sensors connect straight to your router but use more power and often depend on a cloud app.

What is a mmWave presence sensor?

A mmWave radar sensor detects tiny movements such as breathing, so it can tell a room is occupied even when someone sits perfectly still — something ordinary PIR motion sensors cannot do.

HC-SR04 3.3–5V Ultrasonic Module

For robotics learners experimenting with ultrasonic distance measurement.

SKU BLZ-331

$19.99

HC-SR04 3.3–5V Ultrasonic Module is part of the BooLabz Sensors, Robotics & Smart Home collection: the sensors, cameras, servo drivers, and robot kits that let projects perceive and move.

Why we shortlisted it

For robotics learners experimenting with ultrasonic distance measurement.

Listed as

Ultrasonic Sensor Module HC-SR04 3.3V-5V Sensor Development Tools SR04 Version

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FAQs

What is the difference between Zigbee and Wi-Fi smart-home sensors?: Zigbee sensors use a low-power mesh that needs a hub or USB coordinator but sips battery and keeps data local; Wi-Fi sensors connect straight to your router but use more power and often depend on a cloud app.
What is a mmWave presence sensor?: A mmWave radar sensor detects tiny movements such as breathing, so it can tell a room is occupied even when someone sits perfectly still — something ordinary PIR motion sensors cannot do.