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Max.length of wires to connect pins to switches

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planeta9999

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Hello:


Somebody know what is the max.length of wires to connect Ports of Microchip PIC Microcontroller to switches ?
I need connect several switches in matrix configuration with about 3-4meter length wires, and do not know if this length will be excessive and will produce unstable working (by RF interferences, voltage drop, etc..).

I have think about add one ULN2803 to amplify signal, but do not know if really require it.


Regards
 

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