๐ ๏ธ MAKER GUIDEMay 24, 2026โขโฑ๏ธ 1 min readโข๐ณ๐ต Tested in Nepal
RCWL-0516 Microwave Doppler Radar Motion Light Controller (Through-Wall)
Detect human motion through wooden doors, thin drywall, and plastic enclosures using 3.18GHz Doppler microwave radar and 5V relay modules.
๐ ๏ธ BILL OF MATERIALS (BOM)
Required Hardware & Component Checklist
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Estimated Total (5/5 items):
NPRย 1,880
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NPRย 180
NPRย 750
NPRย 150
NPRย 600
NPRย 200
RCWL-0516 Microwave Doppler Radar Motion Light Controller
The RCWL-0516 Doppler Microwave Radar Sensor radiates a 3.18GHz radio wave, detecting human movement through wood and acrylic enclosures to switch lights via a 5V Relay Module.
Hardware Bill of Materials:
- Radar Sensor: RCWL-0516 Microwave Radar Body Induction Doppler Sensor Module
- Microcontroller: Arduino Nano V3.0 Solderless
- Relay Module: 1 channel 5V 10A low level trigger Relay Module
- Power Supply: HLK-PM01 AC-DC 220V to 5V mini power supply module
- Wiring: 40pcs 20cm 2.54mm Male to Female Dupont Wire Jumper Cable
Circuit Pinout & Wiring Connections:
| Sensor / Module Pin | Arduino Nano Pin | Function / Description |
|---|---|---|
| RCWL-0516 VIN / GND | 5V / GND | Doppler Radar Power |
| RCWL-0516 OUT | Pin D2 (INT0) | Active High 3.3V Motion Signal |
| 1-Channel Relay IN | Pin D4 | Low Active Room Light Trigger |
| HLK-PM01 +5V / GND | Nano 5V & GND | AC-to-DC Concealed Wall Box Power |
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