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how much long cable i can use with keypad with out emi ?

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d@nny

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hello
how much long cable i can use with keypad as below schematic ?
keylock.jpg
 

The frequency and current are low so you should be able to use long wires but the question is how far do you want to go?

Alex
 

circuit is working on 5v dc . the frequency is 8mhz. i just want to know the very reasonable length with no error .
 
8mhz is the frequency of the mcu core, the frequency that you scan the keyboard is much much lower

Alex
 

how much log wire i can use ?
 

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