Adafruit
Membrane 3x4 Matrix Keypad
Input data using this 12-button numeric matrix keypad, arranged in a standard telephone-line 3x4 grid. Because the keys are connected in a matrix, you only need 7 microcontroller pins (3 columns and 4 rows) to scan the entire pad, saving valuable I/O resources. Adafruit includes header material to facilitate breadboard integration, though light soldering is necessary for attachment. This version offers a sturdier feel compared to standard membrane keypads. Key technical details include an actuation force between 160-180g and a low contact resistance under 100Ω.
$16.85
Owner Satisfaction
4.5
/ 5
Category Rank
51
/ 168
#51 in Numeric Keypads
Price vs Category Average
-79%
Below average
Force
160180
/ -g
Who it's for
- Highly Affordable
- Slim Profile and Easy Mounting
- Simple Wiring and Interfacing
Who should skip it
- Poor Tactile Feedback and Feel
- Limited Durability and Lifespan
- Vulnerable Ribbon Cable Connection
Key Specs
Force
160-180g
Contact Resistance
<100Ω
Product Dimensions
70.0mm x 51.0mm x 9.7mm / 2.8" x 2.0" x 0.4"
Product Weight
17.6g / 0.6oz
Key Switch Type
Membrane
Model Number
3845
Pinout order
COL2, ROW1, COL1, ROW4, COL3, ROW3, ROW2
Features
- 12 buttons in a 3x4 matrix layout
- Requires only 7 microcontroller pins for scanning
- Includes header for breadboard use
- Sturdier build quality than membrane versions
- Low contact resistance for reliable input
- Simple, low pin-count interface
What customers say
This 3x4 Matrix Keypad is highly valued for its excellent balance of low cost and functionality. Makers appreciate its straightforward integration with Arduino and Raspberry Pi, aided by clear documentation that speeds up prototyping. The membrane design offers a slim, lightweight solution perfect for space constrained enclosures. Users confirm the matrix wiring is robust and reliable for basic data input. While the tactile feel is soft compared to mechanical switches, this trade off is widely accepted given the low profile and affordability. Overall, it is viewed as a high value, essential component for simple electronics input tasks.
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$17