Imported from GitHub: Peppson/water-leak-sms-alarm · commit fb0611b · license GPL-3.0

Description

Small battery powered device that detects water leakage and sends an SMS alert

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/
More images in: 📂 _images/

• 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

Uses mostly through-hole components for easier soldering.
ESP32 is mounted on the bottom side of the PCB.

 

Schematic

SMS Example