Adults onlyESP32Level 3/3
Fall Detector That Sends Your Location
A wearable unit feels a fall, waits to see if the person gets up, and if not it texts family a maps link and calls them.
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Adults only
It runs from a lithium battery pack and uses a SIM card that sends real messages and calls.
Not for children. Build at your own risk.
This is a learning project, not a certified medical alarm. Do not rely on it for anyone’s safety. Protect the lithium pack from crushing and short circuits, and test with a family member who knows the messages are a test.
Strictly follow the description given with this video.
Video
How it works
- A motion sensor watches for the pattern of a fall: a moment of free fall, a hard impact, then no movement.
- If there is no movement for 10 seconds, the ESP32 asks the 4G GPS module for the current location.
- The module sends an SMS with a maps link to the saved family number.
- Then it places a call to the same number so someone answers quickly.
Parts you need
Wiring
PowerGroundSignal
| # | From | Connect to |
|---|---|---|
| 1 Power | Battery + | 12 V rail |
| 2 Power | 4G module VIN | 12 V rail |
| 3 Power | Buck IN | 12 V rail |
| 4 Power | Buck OUT (5.0 V) | ESP32 VIN |
| 5 Ground | All grounds | Common GND |
| 6 Signal | ESP32 D32 (TX) | 4G module pin 8 (RX) |
| 7 Signal | ESP32 D33 (RX) | 4G module pin 10 (TX) |
| 8 Power | Motion sensor VCC | ESP32 3V3 |
| 9 Signal | Motion sensor SCL | ESP32 D18 |
| 10 Signal | Motion sensor SDA | ESP32 D19 |
3D print files
This project has no 3D-printed parts.