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Radar-Controlled Lighting

Automatic Stairway Light With Human Presence Detection

Radar-Controlled Lighting
Radar-Controlled Lighting
PIR-controlled lights and presence detectors are found everywhere. They work quite well, but only for warm moving targets. Radar-based human presence detectors offer better precision and can detect stationary human bodies. This makes them suitable for automatic lighting control in offices and small, dark rooms. In this article, we use such a radar to turn a dark staircase’s lights on and off.

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Materials

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends the Elektor PCB Service service from its business partner Eurocircuits or AISLER as the best services for its own prototypes and volume production.

The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.

PCB

Component list

Component List

[Illustration 230320-012-94]

 

Resistors (THT, 0.25 W)

R1, R5 = 1 kΩ

R2 = LDR

R3 = 2.2 kΩ

R4 = 4.7 kΩ

P1 = 47 kΩ trim pot

 

Semiconductors

IC1, IC2 = TL431, TO92

LED1 = LED 3 mm, red

T1 = IRF9540

T2 = IRF540

 

Miscellaneous

JP1 = 2-way pinheader, 2.54 mm pitch + jumper

K1 = 4-way screw terminal, 5 mm pitch

K2 = 6-way pinheader, 2.54 mm pitch

MOD1 = MP1584 DC-DC converter

MOD2 = HLK-LD2410 radar module + 5-way pin socket, 2.54 mm pitch

Enclosure Hammond 1591 XXA

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