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Topic: 595 & 4021 multiplexing (Read 2323 times) previous topic - next topic

Frenk

Isn`t 74LS595 shift out chip?
I tried a different protoboard, but I get the same results. I tried to use pull ups, but I think I can`t write the program to work correctly. Also I didn`t find time to work on my project, hope I will made it till than. I don`t know why the interference would be a problem with a wires only two or three centimeters long(from buttons to chip) and bit more from chip to arduino board? Maybe the material the wire is made is guilty?
I also tried to connect only one button on chip, and when I push it, I get all eight logic "1" on serial monitor.

Grumpy_Mike

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Isn`t 74LS595 shift out chip?

Yes it is, are you using it as an input? It is the 4021 that is the input chip. Have you got a link to how you have wired it up.
That length of wire is fine.
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I also tried to connect only one button on chip, and when I push it, I get all eight logic "1" on serial monitor.

That sounds to me like you haven't wired things up right.

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