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Keyestudio Large Button 4*4 Matrix Keypad/Single-chip Extended Keypad
1. Circuit grade: 35V(DC)£¬100mA£¬ 1W 2. Contact resistance: 10~ 500(changing with wire length and materials) 3. Insulation resistance: 100M 100V 4. Dielectric Strength: 250VRms(50~60Hz 1min) 5. Electrical shock shaking time: <5ms 6. Service life: Tactility type: 1 million times 7. Operating pressure: Tactility type: 170~397g(6~14oz) 8. Switching path: Tactility type: 0.6~1.5mm 9. Operating temperature: -40~+80'C 10.Storage temperature: -40~+80'C 11.Temperature: 40£¬ 90%~95%£¬ 240H 12. Vibration: 20G£¬max.(10~200Hz£¬Mil-SLD-202£¬M204.Condition B) Introduction: In the application system of microcontroller£¬ keyboard is essential in man-machine dialogue. When you are short of a button£¬ you can connect one to the I/O port of the controller; but when you need a lot of buttons with limited I/O port resources£¬ this 4*4 Matrix Keypad is no doubt your best choice.4*4 matrix keypad is the most applied keypad form. We need to master its keypad identification technology as entry to microcontroller world. Here£¬ we will use an examples to illustrate the identification method of 4*4 matrix keypad. The key layout is in matrix form£¬ so with only eight I/O ports£¬ we can identify 16 buttons£¬ saving lots of I/O port resources.