PLCFIDDLE

1. Combinational circuits

   

2. Triggers: SR, D, T

   

When the diagram becomes complicated enough, one wants to save it. Saving is done on the server, a copy is available through a link in the address field for about a week.

https://www.plcfiddle.com/fiddles/b3aea4a3-8f05-4399-b1cf-284c87de557e

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Pelican Crossing

X1 X2  CR CY CG HR HG
0  0   0  0  1  1  0
0  1   0  1  0  1  0
1  0   1  0  0  0  1
1  1   1  1  0  1  0

CR = X1
CY = X2
CG = not X1 and not X2
HR = not \(X1 and not X2\) = not X1 or X2
HG = X1 and not X2

Finally:

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LOGISIM

1. Where is Logisim?

   

2. Where is Java?

   

3. Testing triggers:

   

4. Pelican Crossing: