Building on the recent Design Brief theme of one-pin keypads, this design uses only one analog microcontroller (MCU) input to scan numerous keys, plus one resistor per key and another resistor and ...

Traditionally, interfacing a microcontroller with an n-by-m keypad required n + m of the microcontroller's I/O pins for keypad scanning. Keypad designs that conserve microcontroller pins have been ...

A US company has come up with an original take on ultra-secure portable storage, fitting a full PIN entry keypad to a USB stick. A US company has come up with an original take on ultra-secure portable ...

Systematic Development Group has released an ultra-secure portable flash drive, fitting a full PIN entry keypad to the USB stick. The Lok-It Secure Flash Drive from comes in two versions, the simpler ...

The Kingston IronKey USB Type-C Keypad 200 is a decent encrypted flash drive, but unless you have a very specific security need, it's probably not worth the cost ...