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Can I connect reed switch with microcontroller using 15 meter cable ?

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emb

Member
Hi all,

I want to connect reed switch with Microcontroller .
The distance between the switch and Mcu about 15 m .

Can I connect the switch with pullup resistor to Mcu ?

Regards :)
 

alec_t

Well-Known Member
Most Helpful Member
Yes, but to reduce the effects of interference pickup it would be advisable to use twisted pair or screened cable and to connect a low-pass filter before the MCU input.
 

alec_t

Well-Known Member
Most Helpful Member
Here you go. Component values depend on the pull-up value and on the frequency of operation of the switch.
LPF.PNG
 
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