KEYPADS & DECODING
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1. 4200 Series Insertable Legend Keypads
Typical applications include communications equipment, security applications, and industrial controllers. |
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2. EB014-30-1 — E-blocks™ Keypad board A simple 4x3 keyboard that allows data entry into bus based systems. Flowcode macros for driving this E-block are available. |
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3. Single-Wire Keypad Interface by Design Ideas Occupying only one free I/O pin, this circuit communicates with a microcontroller by generating a single pulse each time someone presses a key. The pulse's width is proportional to the number of the pressed key, and the microcontroller identifies the pressed key by measuring the pulse's width. |
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4. Keypad Switch — Comfile Technology 2 pages. |
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5. Keypad Decoding This Freescale Semiconductor application note demonstrates the use of a matrix keypad including wakeup from stop mode with HC05 J and K series microcontrollers. The MC68HC705J1A is used as an example. |
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6. Standard Keypads AK-304-FM 1 page. |
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7. Standard Keypads AK-XXXX 2 pages. |
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8. Microchip PIC Controlled HD44780 LCD and 3x4 Matrix Keypad This article provides fundamental information on how to integrate the HD44780 controlled LCD display and matrix keypad with Microchip’s popular 16F877/A. This project can be further improved for numerous applications such as security door lock system and others requiring a hardware interface to input and verify pass keys. |
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9. Piezo Keypad Schurter Electronic Components offers a piezo keypad that provides input systems impervious to all kinds of dirt and fluids. Keypads are particularly suitable for use in outdoor applications. |