Kids OK with adultESP32Level 1/3
Sitting Too Long? A Radar Tells You to Move
A small radar notices you sitting at your desk and beeps after an hour, so you remember to stand up and stretch.
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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.
Low voltage, USB powered. Keep the board in a box so no metal touches the pins.
Strictly follow the description given with this video.
Video
How it works
- The mmWave radar senses a person even when they sit still, because it picks up tiny breathing movements.
- While someone is present, the ESP32 counts up the sitting time.
- After 60 minutes the buzzer beeps until you get up.
- When you leave the chair the timer resets, ready for the next session.
Parts you need
Wiring
PowerGroundSignal
| # | From | Connect to |
|---|---|---|
| 1 Power | Radar V | ESP32 3V3 |
| 2 Ground | Radar G | ESP32 GND |
| 3 Signal | Radar IO | ESP32 D23 |
| 4 Signal | Buzzer + | ESP32 D26 |
| 5 Ground | Buzzer − | ESP32 GND |
3D print files
This project has no 3D-printed parts.