Adults onlyESP32Level 2/3
mmWave Home Automation
Walk in and the light and fan switch on. Sit still and they stay on. Leave and they switch off.
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Adults only
Involves 230V mains switching.
Not for children. Build at your own risk.
All mains wiring must be done by a licensed electrician inside a closed enclosure.
Strictly follow the description given with this video.
Video
The video link will be added here soon.
How it works
- The mmWave radar senses a person even when they sit still.
- Present: the ESP32 switches relay 1 (light) and relay 2 (fan) on.
- After a short empty-room delay, both switch off.
- HIGH-level-trigger relays work directly from the ESP32's 3.3V pins.
Parts you need
mmWave radar sensor (24 GHz presence)× 1Buy
ESP32 development board (30-pin)₹518× 1Buy
2× 1-channel 5V relay modules (HIGH-level trigger)₹57× 2Buy
5V USB supply× 1Buy
Kit for this projectPrice on request
Get the kitWiring
PowerGroundSignal
| # | From | Connect to |
|---|---|---|
| 1 Power | Radar V | ESP32 3V3 |
| 2 Ground | Radar G | ESP32 GND |
| 3 Signal | Radar IO | ESP32 D23 |
| 4 Power | ESP32 VIN / GND | 5V / GND rails |
| 5 Signal | Relay 1 IN (light) | ESP32 D32 |
| 6 Signal | Relay 2 IN (fan) | ESP32 D26 |
| 7 Power | Relay VCC | 5V rail |
| 8 Ground | Relay GND | GND rail |
| 9 Signal | Relay COM / NO | Light and fan circuits (electrician) |
