4-bit combination lock

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4-bit combination lock Empty 4-bit combination lock

Post by acsempronio 9/15/2011, 3:44 pm

Please reference the graphic:
A,B,C,D = Input buttons. Button press = 1, no button press = 0. A button may only be pressed once. Pressing again does nothing.

O = Output. Pressing this button sends the signal to trigger an event (door, bridge, stairs, etc.)

R = Reset. If the combination is entered wrong (i.e. a button was pressed accidentally) the reset button resets the entire circuit to 0-0-0-0

The lock out switch does just that, it prevents any input on the combination buttons. It can be a switch or simply wired into another circuit.

It uses 5 RS-NOR latches for the buttons. these sustain the current after the button is pressed because buttons only momentarily provide current.
The 4 AND gates are for decoding the bits.
The first line of yellow blocks to the left of the AND gates are where you set the inverter torches. All inverter torches are for "0" and all non-Inverter are for "1." In this example, the combo is 0-1-1-0.

It's 4 bits, so it's only 16 combinations, but hey... it's redstone, not an IC!
White blocks are level 1, yellow are level 2, grey are level 3.
Some knowledge of redstone circuits are necessary.

I have the scematic file for REK's redstone circuit simulator v.81

4-bit combination lock 4-bit-11

acsempronio
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