https://github.com/peppson/water-leak-sms-alarm

A small battery-powered device that detects water leakage and sends an SMS alert.
https://github.com/peppson/water-leak-sms-alarm

esp32 platformio sim800l

Last synced: about 1 month ago
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A small battery-powered device that detects water leakage and sends an SMS alert.

• Host: GitHub
• URL: https://github.com/peppson/water-leak-sms-alarm
• Owner: Peppson
• License: gpl-3.0
• Created: 2024-04-30T15:26:25.000Z (9 months ago)
• Default Branch: main
• Last Pushed: 2024-08-08T14:35:55.000Z (5 months ago)
• Last Synced: 2024-10-31T03:22:48.370Z (3 months ago)
• Language: C++
• Homepage:
• Size: 7.88 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.MD
  • License: LICENSE

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README

        

# water-leak-sms-alarm   

A small battery-powered device that detects water leakage and sends an SMS alert.  

 

## Features

- Completely `off` until water *(or anything conductive)* closes the circuit between two of its legs,  

thereby latching on the "soft latching power circuit".  

Which can later be turned off again by the microcontroller.

- Latches `on` by either water detection or by pressing the test button.

- Sends an SMS alert if water is detected.

- Sends SMS diagnostics if the test button is pressed.

- Built with an ESP32 and PlatformIO, in C++.

  

## Schematic and PCB

KiCad files can be found here: 

[📂 _KiCad/](./_KiCad/)  

More images in: 

[📂 _images/](./_images/)

    

        Parts used

       

- ESP32 D1 Mini Node MCU 

- SIM800L module with external antenna  

- 3.3V LDO: MCP1700-3302E (250mA)

- LED: WS2812B  

- P-channel mos: NTR4101PT1G 

- N-channel mos: PMV16XNR  

- Cap 470uF: Electrolytic  

- Cap 22uF: Electrolytic

- Cap 1uF: Ceramic  

- Cap 100nF: Ceramic

- Switch: Momentary DPST  

- Conductive legs in copper/brass  

    

        PCB

       

> Uses mostly through-hole components for easier soldering.  

> ESP32 is mounted on the bottom side of the PCB.

![PCB](./_images/PCB_layout_2.PNG)

 

### Schematic

![Schematic](./_images/schematic_2.png)

 

### Hardware

> This picture shows version 1.  

> Version 2 eliminates some of the large capacitors that occasionally made the unit bootloop.  

![Hardware](./_images/hardware.jpg)

 

## SMS Example