The project works much like a Hirsch Scramblepad but with a couple of simplifications. Here is the operation:

When the MacroPad is powered up via the USB port, the title bar on the display will say Scramblepad. The spaces below correspond to the 12 keys in the keypad. The program will label those appropriately during each mode of operation.

START Mode - press the lower left key to begin


The mode where there is inly the word START in the lower left corner is the initial starting mode. No keypad input works except the lower left key. That must be pressed to enable the ability to enter a passcode.

I used black windowed lamp keycaps for this key and for the lower right key. Lower right only indicates open and closed, it is not used to enter data). Differentiating these keys with darkened, windows keys helps with understanding operation. If you could find a key that actually says START it'd be a huge bonus.

ENTRY mode


Once the START key has been pressed, the keyboard will flash and random sequences of keys will be shown on the display three times. 

Finally, ten numbers will be on the display, corresponding to the lights on the keypad.

The user is expected to enter the password one digit at a time, looking at the display to see where the next number is and pushing the corresponding key on the keypad. Do not assume the keys are numbered like a phone dialing pad, this is scrambled input.


When the passcode is entered correctly, the lower right key will turn green and OPEN will be on the display for that key. If you have connected a solenoid per the Lock Circuit page, the lock should click open for 2 seconds.

After 7 seconds the lock will go back to START Mode.


If after the number of digits in the passcode the wrong passcode is entered, the lower left key will be marked FAIL and blink red 3 times. Then the keypad will go back to the START Mode.

Pressing START during ENTRY

If you wish to start over entering a passcode, press the lower left START key at any time. The keypad will scramble 3 times and you can try again noting the numbers in their new locations.

This guide was first published on Sep 01, 2021. It was last updated on May 26, 2024.

This page (Use) was last updated on Mar 08, 2024.

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