کی پد فلت 4X4 ماتریسی:

کی پد فلت 4X4 ماتریسی با پشت چسبنده دارای یک ماتریس 4×4 از حروف و اعداد شامل 0-9 و A-D به همراه نمادهای ‘*’ و ‘#’ برای اطمینان بخش.

ویژگی ها:

طراحی فوق العاده نازک.

پشت چسبنده.

نسبت عالی قیمت/کارایی.

رابط آسان با هر میکروکنترلر.

ایده های کاربرد:

سیستم های امنیتی.

انتخاب منو.

ورود داده برای سیستم های جاساز شده.

مشخصات کلیدی:

حداکثر ریت: 24 ولت جریان مستقيم، 30 ميلي آمپر.

رابط: دسترسي 8 پین به ماتريس 4×4.

دمای عملکرد: 32 تا 122 درجه فارنهایت (0 تا 50 درجه سانتيگراد).

ابعاد: کيپد، 2.7 × 3.0 اینچ (6.9 × 7.6 سانتي‌متر)

Membrane Keypad 4X4 Matrix:

DESCRIPTION:
This membrane keypad with an adhesive back has a 4×4 matrix of letters and numbers including 0-9 and A-D along with the ‘*’ and ‘#’ symbols for good measure.

Features:

Ultra-thin design
Adhesive backing
Excellent price/performance ratio
Easy interface to any microcontroller
Application Ideas

Security systems
Menu selection
Data entry for embedded systems
Key Specifications

Maximum Rating: 24 VDC, 30 mA
Interface: 8-pin access to 4×4 matrix
Operating temperature: 32 to 122 °F (0 to 50°C)
Dimensions: Keypad, 2.7 x 3.0 in (6.9 x 7.6 cm)

specification:

Cable Length: 3-1/3″ or 85mm (include connector)
Weight: 8g
Connector: Dupont 8 pins, 0.1″ (2.54mm) Pitch
Mount Style: Self-Adherence
Max. Circuit Rating: 24VDC, 30mA
Insulation Spec.: 100M Ohm, 100V
Dielectric Withstand: 250VRms (60Hz, 1min)
Contact Bounce: <=5ms
Life Expectancy: 1 million closures
Operation Temperature: -20 to +40 °C

For example, if the ‘8’ button is pressed, there will be a low resistance path between the R2 and C1 pins. If the MCU sets R2 as a LOW output and reads C1 as an input, it will see the LOW and know that the ‘8’ button was pressed. These button pushes can easily be detected using 8 pins on an MCU.

How it Works
Matrix keypads use a combination of four rows and four columns to provide button states to the host device, typically a microcontroller. Underneath each key is a pushbutton, with one end connected to one row, and the other end connected to one column. These connections are shown below.