Kids OK with adultESP32Level 2/3
What Is LoRa? A Long-Range Gate Alert
LoRa sends small messages kilometres away on very little power. Try it with a gate alert: a sensor at the gate, an alarm inside the house.
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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. Always connect the antenna before powering a LoRa module, and use the frequency band that is legal in your country (865–867 MHz in India).
Strictly follow the description given with this video.
Video
How it works
- LoRa radios trade speed for range: tiny packets travel kilometres and a battery lasts for months.
- At the gate, a reed switch tells the transmitter ESP32 when the gate opens.
- It sends a short “GATE OPEN” packet on the LoRa band.
- Inside, the receiver ESP32 shows the message on the OLED and sounds the buzzer.
Parts you need
Wiring
PowerGroundSignal
| # | From | Connect to |
|---|---|---|
| 1 Power | LoRa VCC (both) | ESP32 3V3 |
| 2 Ground | LoRa GND (both) | ESP32 GND |
| 3 Signal | LoRa NSS | ESP32 D5 |
| 4 Signal | LoRa SCK | ESP32 D18 |
| 5 Signal | LoRa MISO | ESP32 D19 |
| 6 Signal | LoRa MOSI | ESP32 D23 |
| 7 Signal | LoRa RST | ESP32 D16 |
| 8 Signal | LoRa DIO0 | ESP32 D4 |
| 9 Signal | Gate: reed switch | ESP32 D27 and GND |
| 10 Signal | House: OLED SDA / SCL | ESP32 D21 / D22 |
| 11 Signal | House: buzzer + | ESP32 D25 |
3D print files
This project has no 3D-printed parts.