Overview 📝
The 1×4 Membrane Matrix Keypad is a durable, low-cost input device featuring four individual micro-switches sealed beneath a flexible plastic layer. Because it is completely sealed, it is water-resistant and dust-proof—making it highly reliable for messy workshop or industrial environments. The back of the keypad features a strong 3M self-adhesive tape, allowing you to instantly peel and stick the interface directly onto your custom project enclosure, robot chassis, or acrylic panel for a professional, clean finish.
Key Features ✨
Ultra-Thin Design: Paper-thin profile seamlessly integrates into flat surfaces without drilling massive holes.
Peel-and-Stick Backing: Premium 3M adhesive layer on the back makes panel-mounting effortless.
Dust & Splash Resistant: Sealed membrane keys ensure dirt, grease, or minor water drops won’t ruin your circuit.
Flexible Breadboard Interface: Comes with a standard 2.54mm (0.1″) pitch 5-pin female Dupont connector that plugs directly into jumper wires, breadboards, or header pins.
Technical Specifications ⚙️
| Feature | Specification |
| Key Configuration | 1 Row x 4 Columns (4 Buttons Total) |
| Labels / Characters | S1, S2, S3, S4 (or 1, 2, 3, 4 depending on batch) |
| Connector Type | 5-Pin Female Dupont (2.54mm Pitch) |
| Maximum Rating | 24V DC, 30mA |
| Insulation Resistance | 100M Ω, 100V |
| Dielectric Strength | 250V Rms (50 – 60 Hz, 1 min) |
| Contact Bounce | Less than or equal to 5ms |
| Lifespan | Over 1 million presses per key |
| Cable Length | Approx. 85mm (including connector) |
| Pad Dimensions | 69mm x 20mm x 0.8mm |
Pinout Configuration
Looking at the 5-pin connector from left to right:
Pin 1: Common Ground / VCC (Depending on active high/low configuration)
Pin 2: Button 1 (S1) Output
Pin 3: Button 2 (S2) Output
Pin 4: Button 3 (S3) Output
Pin 5: Button 4 (S4) Output
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