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4×4 matrix membrane keypad
4×4 matrix membrane keypad with 16 keys for Arduino, Raspberry Pi, and microcontroller input projects.
Description
The 4×4 Matrix Membrane Keypad is a compact and flexible input device featuring 16 keys arranged in a 4×4 matrix. Designed for durability and low-profile use, it provides a reliable interface for Arduino, Raspberry Pi, ESP32, and other microcontroller projects.
Ideal for password entry, menu navigation, calculator projects, security systems, and custom input devices, this keypad allows easy integration through its 8-pin matrix interface. The membrane design ensures long-lasting performance while keeping the module thin and lightweight, perfect for DIY electronics and embedded systems.
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Text to Speech TTL Module (Serial to Speech)
-  Single row 0.1″ header for easy connection to a host system
- Power requirements: +5 VDC
- 30 mA idle
- 46-220 mA active (depending on speech parameters and output load)
- Â Communication: Asynchronous 9600 bps serial (8N1)
- Dimensions: 1.25″x1.5″x0.37″
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Text support rate is better
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 Interface operation is simpler
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5V single power supply.
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Output directly connected to the speaker, can drive 4 ohms 3W / 8 ohm 2W speakers
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Busy status output, can be connected to the microcontroller IO or indicator light, no need to be left floating.
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 Voice effect optimization
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 Module miniaturization and easy integration
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Dimension: 33*27.5mm
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With mounting holes
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