Water-Alarm
About the Water-Alarm PCB
Water-Alarm is an open source PCB design by nikspolaroid, published on GitHub. It is a 2-layer board measuring 37.5 × 40.4 mm, with 8 components from 8 distinct parts.
By type, the board carries 2 connectors, 2 resistors, 1 transistor, 1 buzzer, 1 diode and 1 capacitor.
From the project
Simple water detection alarm PCB designed in KiCad 10- beginner project
A simple, low-cost water detection alarm PCB designed in KiCad 10.0 as a beginner PCB project. Triggered by water contact, it activates a buzzer and LED to alert the user.
When water bridges the two sensor probe contacts (J2), it provides a conduction path that biases the gate of the 2N7000 N-channel MOSFET (Q1). The MOSFET turns on, completing the circuit for both the buzzer (BZ1) and the status LED (D1) — alerting you to the presence of water.
Water-Alarm bill of materials (BOM)
8 components, 8 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 2N7000 | TO-92L_HandSolder | Q1 |
| 1 | Jack-DC | BarrelJack_GCT_DCJ200-10-A_Horizontal | J1 |
| 1 | Screw_Terminal_01x02 | TerminalBlock_Phoenix_PT-1,5-2-5.0-H_1x02_P5.00mm_Horizontal | J2 |
| 1 | ~ | Buzzer_D30mm_H20mm_P15mm__668-1652-ND__AI-3035-TT-12V-R | BZ1 |
| 1 | LED_Small_Filled | LED_D5.0mm | D1 |
| 1 | 1nF | C_Disc_D3.0mm_W1.6mm_P2.50mm | C1 |
| 1 | 10M | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1 |
| 1 | 6.8K | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R2 |
Water-Alarm design files
The KiCad project lives in the nikspolaroid/Water-Alarm-KiCad repository on GitHub; these links point at the commit this page was built from.
- LayoutWater Alarm.kicad_pcb
- SchematicWater Alarm.kicad_sch
Water-Alarm: common questions
How big is the Water-Alarm PCB?
The Water-Alarm measures 37.5 × 40.4 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Water-Alarm?
8 components, from 8 distinct parts. The full bill of materials is listed on this page.
Where can I download the Water-Alarm design files?
From the nikspolaroid/Water-Alarm-KiCad repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Water-Alarm design in my own project?
The repository has no license, so all rights stay with nikspolaroid. Use it as a reference, and ask the author before reusing the design.