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Microcontroller Hardware
Published in Syed R. Rizvi, Microcontroller Programming, 2016
A keypad is a set of buttons arranged in a block or “pad” that usually bear digits and other symbols and usually a complete set of alphabetical letters. Switch matrix keyboards and keypads are really just an extension of the button concepts. Figure 3.12 shows a keypad with a connector that can plug the keypad directly into the decoder/driver chip or the starter kits. If a keypad only contains numbers, it is called a numeric keypad. Keypads are found on many alphanumeric keyboards and on other devices such as calculators, push-button telephones, combination locks, and digital door locks, which require mainly numeric input. They are part of mobile phones that are replaceable, and sit on a sensor board of the phone. Some multimedia mobile phones have a small joystick that has a cap to match the keypad. Keypads are also a feature of some combination locks. This type of lock is often used on doors such as that found at the main entrance to some offices.
Circuit Components
Published in Julio Sanchez, Maria P. Canton, Microcontroller Programming, 2018
Julio Sanchez, Maria P. Canton
In the context of microcontroller-based circuits, a keypad (also called a numeric keypad) is a set of pushbutton switches sometimes labeled with digits, mathematical symbols, or letters of the alphabet. For example, a calculator keypad contains the decimal (occasionally hexadecimal) digits, the decimal point, and keys for the mathematical features of the calculator. Although in theory the computer keyboard is a keypad, the keypad is usually limited to a smaller arrangement of buttons or to part of a computer keyboard consisting mainly of numeric keys.
Input and Output Devices
Published in Julio Sanchez, Maria P. Canton, Embedded Systems Circuits and Programming, 2017
Julio Sanchez, Maria P. Canton
In the world of microcontroller-based circuits, a keypad (also called a numeric keypad) is a set of pushbutton switches sometimes labeled with digits, mathematical symbols, or letters of the alphabet. In this sense, a calculator keypad contains the decimal (or occasionally hexadecimal) digits, the decimal point, as well as keys for the mathematical features of the calculator. Although in theory the computer keyboard is a keypad, the keypad is usually a smaller arrangement of buttons, or refers to a part or area of a computer keyboard.
Area Design of Keyboard Layout for Comfortable Texting Ability with the Thumb Jacobian Matrix
Published in International Journal of Human–Computer Interaction, 2022
Le Xiong, Chenglong Fu, Shiming Deng
In the past few years, the study of the keyboard layout has attracted much attention (Armand et al., 2014; Chun, 2015; Hoober, 2013; Li et al., 2006; Stokel-Walker, 2013; Trudeau et al., 2013, 2014; Vicente, 2019). Both the accuracy and speed impacts of number entry with the telephone and calculator numeric keypad layouts were studied (Armand et al., 2014). For a two-handed grip on a tablet, thumb typing speed, self-reported discomfort, task difficulty, and thumb/wrist postures vary across keyboard configurations (Alamdar Yazdi et al., 2018; Trudeau et al., 2013). The empirical data study results (Trudeau et al., 2014) show that standard virtual keyboard layouts may not maximize thumb typing performance, which means that the standard handheld device keyboard layout needs to be improved. A design method of smartphone keyboard layout was proposed for fast typing Korean text messages with one thumb (Chun, 2015). While soft keyboards dominate today’s smartphones, there are a few phones such as Blackberry, etc., that still use physical QWERTY keyboards (Vicente, 2019), and such keyboards may still appeal to users who are accustomed to using both left and right thumbs to operate their phones. But not everyone uses QWERTY keyboards! Six alternative layouts can be found (Stokel-Walker, 2013): AZERTY is one such version that used in French-speaking countries across Europe and Africa. Another slight tweak on the tried-and-tested QWERTY layout is QWERTZ that is used predominately in Central Europe (Germany, Austria, the Czech Republic, and other nearby nations). Dvorak felt that QWERTY was uneconomical and uncomfortable – and therefore was not the perfect layout, he designed his Dvorak keyboard layout in 1936. The Colemak keyboard layout makes 17 changes to QWERTY key layout, and aims at appeasing those who are uncomfortable with QWERTY but do not feel like adopting a whole new layout. JCUKEN has been the default layout for Russian keyboards since 1917. There is another keyboard layout called Maltron. It should be pointed out that how to optimize the smartphone keyboard layout to endow smartphones with rich functions and comfortable operating ability, so as to enhance the competitiveness of smartphones in the market, which is still an unsolved challenge at present. So far, no scientific method has been found to design the layout of the smartphone’s soft keyboard that makes single-thumb operation the most comfortable.