Compared across 2 stores. Prices are checked against each store and labelled with when.
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The DFRobot 24GHz Human Presence Sensing Module is a small radar board that detects people, including people who are sitting still, by sensing the tiny movements of breathing. Unlike a PIR sensor, which only fires on motion, it keeps reporting presence while someone stays in the room. It covers roughly 0.75 to 6 m at ±60°, runs from 5–12 V, and outputs presence and distance over a serial interface. It suits makers building room-occupancy automation, lighting or energy-saving projects, and it is a step up from PIR for still occupants, though it is not a people counter and its distance readings are coarse.
In stock
In stock
Lowest price we've seen: $9.90 on Nov 9 at DFRobot. Tracked across 2 stores since Nov 9.
Makers who use it rate it well for keeping presence detected when someone sits still, which is the main reason to choose it over PIR. Complaints centre on false triggers from moving objects and on the coarse distance output.
