A 4 by 4 keypad is a tiny gadget that allows you to type numbers and letters by poking buttons. You may have seen one on a calculator or a security system. In total, it has 16 keys in a grid of four rows and columns. Each key represents a number, letter or symbol.
On a 4 by 4 keypad, you just push the key for the number or letter you need. If you would like to type the number 5 for instance, you would press the key in the second row and first column. The key recognition is made using a particular technology called "key matrix".
Security systems use 4 by 4 keypads for entering a passcode. You can protect your belongings or information by creating a secret set of numbers. To open the system you'll have to use the keypad to input the correct code. The system won’t let you in if that code is bad.
One nice thing about 4 by 4 keypads is that they are small, which means that they will easily fit within the cases of a lot of consumer electronics. It is reasonably rugged and dependable, and can be used a good deal over time. Certain keypads even illuminate, enabling the keys to be seen more easily in the dark.
And if you want to modify the way your 4 by 4 keypad works, you can always program it using a microcontroller. You can set the respective tasks for each button, it can be used as a microcontroller input, to connect to a PC as an input device or connect to a MCU to control other devices. For instance, you could have a key turn on a light, or play sound when it is pressed. This way, you can reprogram the keypad for your convenience.
4×4 Keypad in Device8332How to read input of wired keypad(py) as 4×4 Matrix4×4 Keyboard with arduino as a 2×244-by-4 Keypad Using I2C (PCF8575)0Using Interrupt with keypad in 12F675Can I use a scan code with a 83@2 keypad?
4 by 4 keypads are used in a number of electronic devices such as calculators, remote controls, and alarm systems. They provide a fast, easy method to input data. Whether you have to calculate something, turn some knobs, you merely have to key in some codes, a 4 by 4 keypad can serve as the right tool.
Copyright © Dongguan Soushine Industry Co.,Ltd. All Rights Reserved - Privacy Policy
