This is a 4×4 matrix sixteen key membrane switch keypad that is easy to use and will look nice in your project. It has 8 outputs, you should use the “Scan mode” to judge which button has been pressed down.
Specification
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Pad Size: 70 * 77 * 0.8mm
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Cable Length: 85mm(include connector)
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Connector: 8 pins female header, 2.54mm Pitch
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Max Circuit Rating: 35VDC, 100mA
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Insulation Spe: 100M Ohm, 100V
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Dielectric Withstand: 250VRms (60Hz, 1min)
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Contact Bounce: <=5ms
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Life Expectancy: 1 million closures
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Operation Temperature: -20 to +40 °C
**Tutorial