NSIS PAD / QL4


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NSIS PAD, or Nanosistemas Pad, was another personal project that started in 2000 after the Nanosistemas Operating System. The idea was to create an embedded version of the operating system, providing a touchscreen graphical interface to any electronic project that needed one. It involved the creation of an embedded version of the operating system and the base electronics for it. After joining Corporate Safe Specialists, they assigned me to develop the QL4; an advanced safe lock based on the NSIS PAD.

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NSIS PAD / QL4 Demonstration

This is a demonstration of the NSIS PAD in operation as the QL4.

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About this video

This video shows a demonstration of the QL4. Its an advanced safe lock designed for Corporate Safe Specialists based on the NSIS PAD, mostly for use in cash controlling safes, such as store safes and safes for business that handle a significant amount of cash.

Both the electronics and the firmware were developed by myself starting in 2001 as a continuation of the NSIS PAD. Security features were then added to the operating system, along with improvements on the graphical user interface to add some of the necessary functionality.

Note that the QL4 shown above was assembled just for this presentation. The safe locks are not connected to it, and so it will report an open circuit on them when we attempt to unlock the safe doors on the video. Also, this QL4 is not connected to the coin dispenser unit. Therefore, that part cannot be fully demonstrated. The firmware, however, was modified to force a given number of coin rolls on each column of the coin dispenser just to provide a better understanding of the system's operation.

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Pictures of the NSIS PAD / QL4

Miscellaneous pictures of the system.



Earlier version of the QL4 at the login screen.

Window where you create or edit users.

Keyboard appears when you tap a textbox.

Seismic watchdog setup window. You can program the watchdog to sense
small vibrations on the safe during a set schedule and act as programmed.

How the time range of a day is set.

Holidays can be programmed into the system to, for example,
forbid the safe from being opened during holidays.

Coin dispenser unit being developed as part of the QL4.

This shows the system being assembled.

Very early development stage of the NSIS PAD, after
being able to simply show text on the screen.