Kids OK with adultESP32Level 1/3
mmWave Presence Sensor
Normal motion sensors miss a person sitting still. A 24 GHz mmWave radar sees you even when you don't move.
Kids OK, with an adult
DIY project. Children must build this only with an adult (16+ years) beside them at all times. Not suitable for children under 8 years.
Strictly follow the description given with this video.
Video
The video link will be added here soon.
How it works
- The radar sends 24 GHz waves and senses tiny movements like breathing.
- Its IO pin stays HIGH while a person is present.
- The ESP32 reads IO on D23.
- It lights the LED on D26 through a 220 Ω resistor.
Parts you need
- mmWave radar sensor (24 GHz presence)× 1Buy
- ESP32 development board (30-pin)× 1Buy
- 5 mm LED + 220 Ω resistor× 1Buy
- USB cable× 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 Signal | ESP32 D26 | 220 Ω → LED + |
| 5 Ground | LED − | ESP32 GND |
3D print files
- Radar wall caseSettings in the STL zip READMELink at launch
Code
The tested Arduino / ESP32 code for this project will be posted here, ready to copy.