Motion sensor (PIR motion detector)

01

Set detection range, angle and mounting

Aqara's Motion Sensor P1 lists a 170° field of view out to 2 m and 150° out to 7 m, a 360° adjustable stand, a detection timeout configurable from 1 to 200 s, adjustable sensitivity and a built-in light sensor that can turn lights on only when it is dark and motion is detected. [1] HKT's LoRaWAN PIR sensor lists a detection range of 8–10 m and angle of 50–60°, ceiling or wall mounting at 1.5–2.0 m installation height, anti-tamper and low-battery alarms and a light sensor that can link detection to scenes. [2]

BluNet lists PIR sensors and motion detectors in its alarm and emergency-lighting range [3], Greenough lists solar LED street and flood lights with PIR motion sensors and PIR/microwave sensor tubes [4], and HECOR lists a human-body sensor switch that turns lights and fans on or off. [5]

Editorial calculation: the area covered by a fan-shaped pattern is ½ × r² × angle in radians — for 150° (2.62 rad) at 7 m, ½ × 49 × 2.62 ≈ 64 m²; for 55° (0.96 rad) at 9 m, ½ × 81 × 0.96 ≈ 39 m². [1] [2]

Give the supplier the area and the direction people move across it, required range and angle, mounting height and surface, timeout and sensitivity range, light-level threshold, output type (relay, dry contact, wireless message), power source, wireless protocol and region, operating temperature and humidity, enclosure and IP rating, and quantity.

02

Check power, wireless link and environment

The HKT sensor lists a built-in 8,000 mAh Li-SOCl2 battery with a 5-year lifespan, standby current ≤10 µA, detection current ≤25 µA and transmit current ≤125 mA; LoRa bands including EU863–870, US902–928 and CN470–510 MHz at up to 19 dBm and −141 dBm sensitivity; operation at −10 to 55 °C and 10–95% humidity non-condensing; and an 86 × 86 × 26 mm body. [2] The Aqara P1 uses Zigbee 3.0 with over-the-air updates and lists up to five years of battery life on two CR2450 cells, achievable with the LED indication turned off and a detection timeout of at least 30 s and depending on triggering frequency and settings. [1]

Editorial calculation: 8,000 mAh at 10 µA standby alone would last 800,000 h (over 90 years), so battery life is set by detections, radio transmissions and the battery's own ageing rather than standby current — which is why the maker quotes 5 years. [2]

Editorial note: ask for the detection-pattern drawing at your mounting height and compare it with the paths people take through the area. [2]

03

PIR products listed: battery IoT sensors, alarm detectors, switches and solar lights

The listings reviewed cover Zigbee and LoRaWAN battery PIR sensors, alarm PIR detectors, sensor switches for lights and fans, and solar lights with PIR sensors. Ask each for the detection pattern drawing, mounting height, current consumption and environmental ratings. [1] [2] [3] [4] [5]

04

Pyroelectric element and lens, sensitivity, light sensor, timer, radio and battery

The timer range, sensitivity setting and light-sensor behaviour are the Aqara P1's; the battery row is HKT's 8,000 mAh cell.

05

Coverage, power and environment figures from the Aqara and HKT sheets

HKT's LoRaWAN sensor supplies the current, temperature and humidity values and Aqara the wider angles; response time, storage temperature, IP code, false-trigger rate and weight are not stated in the sources reviewed.

06

Send the coverage, power and link data together

Paste it into your enquiry below or into an email to a maker, then replace every bracket.

Area/path: [m; direction]
Pattern: [range m; angle °]
Mounting: [height; wall/ceiling]
Behaviour: [timeout s; lux; sensitivity]
Output: [relay; Zigbee; LoRaWAN; region]
Power: [battery; mains; solar]
Environment: [°C; RH; IP]
Quantity: [units]

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