ET-S75
Water Leak / Rain Detector
Gold-plated probe with adjustable digital and analog outputs
AED 15.00
Out of stockOverview
Gold-plated probe with adjustable digital and analog outputs
The ET-S75 is built around the Interdigitated gold (ENIG) comb on the board + screw terminal for a remote probe or two wires on the floor. It runs from 3.3–5V, ~1mA.
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- Leak alerts under sinks and heaters
- Rain detection
- Tank overflow warnings
Key features
What makes it different
Sensing
Interdigitated gold (ENIG) comb on the board + screw terminal for a remote probe or two wires on the floor
Outputs
DO digital (adjustable threshold, hysteresis) + AO analog
Supply
3.3–5V, ~1mA
Comparator
LM393, 25-turn trim pot
Open documentation
Schematic, BOM and layout notes published for every board.
Breadboard friendly
Standard 2.54 mm pitch and M2.5 mounting holes.
Specifications
Technical specifications
| Sensing | Interdigitated gold (ENIG) comb on the board + screw terminal for a remote probe or two wires on the floor |
|---|---|
| Outputs | DO digital (adjustable threshold, hysteresis) + AO analog |
| Supply | 3.3–5V, ~1mA |
| Comparator | LM393, 25-turn trim pot |
| Size | 40.0 × 25.0 mm |
|---|---|
| Mounting | 4 × M2.5 holes, 2.54 mm from each corner |
| Connectors | 4-pin 2.54 mm header · Screw terminal 2P 5.0mm 17A (THT) — Remote probe (two wires / pads) |
| Main IC | LM393DR2G (LCSC C7955) |
| Revision | Rev A |
| Libraries | Any GPIO / ADC; ESPHome binary_sensor + adc |
|---|
Performance
Power use
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VIN | Power | 3.3–5V (power from a GPIO to limit probe corrosion) |
| 2 | GND | Ground | Ground |
| 3 | DO | Signal | Low = wet (open-collector, 10k pull-up) |
| 4 | AO | Signal | Analog wetness: lower = wetter |
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-S75 Water Leak / Rain Detector (assembled)
- 1 × 4-pin 2.54 mm male header, unsoldered
Getting started
- Wire the header: VIN, GND, DO, AO
- Libraries: Any GPIO / ADC
Compare
Which simple sensor?
| Water Leak / Rain Detector (this board)This board | ET-S71 5-Channel IR Line Sensor | ET-S72 IR Remote Receiver + Transmitter | ET-S74 DRV5032 Magnetic Door Switch | |
|---|---|---|---|---|
| What it does | Gold-plated probe with adjustable digital and analog outputs | 5 reflective IR sensors with analog outputs and emitter enable | Learn and send TV / AC remote codes, 38 kHz | Ultra-low-power Hall switch for doors and lids |
| Interface | — | 5 analog outputs (use ADC pins) + emitter enable | RX digital out (active low), TX logic in (carrier… | Push-pull digital out, low with magnet |
| Best for | Leak alerts under sinks and heaters | Line-following robots | Home Assistant IR blasters | Door and window sensors |
| Price | 15 AED | 29 AED | 22 AED | 12 AED |
Downloads
Documents and design files
Need a custom version of this board?
Different connector, size or sensor? We design and build custom variants.