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Not a hundred % sure but it was probably just a wrong wire or 2. Wiring diagrams are usually pretty much straight forward so I usually just slap them together and they work ... if I get lucky. ...

I'm trying to make an alarm system and I don't want it to be limited by to few switches. Now I know everyone is going to say how many doors do you have that you want to put a sensor on. Well its...

So i ripped my circuit down and simplified it with a 16f84a and that worked with all my lcd's. Rebuilt it with the 16f877a and it now works as well. I must have had something messed up in the first...

Just put in a 10k pot and I can adjust the crap out of it ... still not displaying any text #$%#!#@$%^

Also I can replace the lcd with 8 led's and make them flash, so pretty sure the rest of my circuit is working ok.

Still the same went as high as 500. Also put in a PAUSE of 900 before first lcd out. I don't think it can be a busted lcd cause i have 4 and they all do the same thing. Unless this model is just...

After searching the forum for 2x16 I still can't see what my problem is. I have a 2x16 lcd connected to a 16f877a and it only displays solid boxes on the first row. The code I'm using works fine on...

Can this be used with normally closed switches?

I'm trying to make my own alarm system.

A conventional keyboard matrix can be drawn as rows and columns of wires, with a switch where each row wire crosses a column wire.
You scan the matrix by (for example) having pull-up resistors on...

I'm wondering if its possible to use a similar circuit to the keyboard matrix circuit that you can find all over the place. What I'm trying to do is replace all the normally open switches with...