If you’ve scavenged some random keypads and want to reuse them in a project without the hassle of figuring out the pinouts, then [Cliff Biffle] has an interface module for you. The Keypad Go connects ...

This idea builds on a previous IFD, "Connect Any Keypad With Any Microcontroller Using Only One Pin" (electronic design, May 1, 1998, p. 126), where a 555 timer connects a keypad switch matrix to a ...

The AT-VKP-8E provides IP-based system control in environments where a straightforward keypad interface is preferred, such as standard classrooms and small meeting spaces. When you purchase through ...

In most keypads, pressing a key closes a contact that bridges two lines in an xy matrix. If you use a microcontroller to detect a key closure, checking the states of (x+y) lines requires an equal ...

During 2015 Storm introduced the first in a new generation of toughened access control keypads featuring HID® iCLASS® and SEOS® contactless technology. These products are now available from the ...

Often in the use of products with keypads, one or more keys become “stuck” or are being pressed. For example, a cell phone in the bottom of a purse or in a hip pocket could have one or more of its ...

APEM offers total control panel assembly solutions with silicone keypad interface. APEM Components, Inc., a manufacturer of quality switches and joysticks, has announced the availability of total ...

The most common method for interfacing multiple switches—multiplexing— allows for the connection of (N/2)2 switches with N microcontroller IO lines. The method described below, which has its roots in ...