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

E

emb

Member

• Jan 13, 2018

• #1

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

• Jan 13, 2018

• #2

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.

 

E

emb

Member

• Jan 13, 2018

• #3

thank you

could u post a schematic for the low pass filter ^.^

regards

 

C

Colin

Active Member

• Jan 13, 2018

• #4

The pull-up can be as low as 1k

 

alec_t

Well-Known Member

Most Helpful Member

• Jan 14, 2018

• #5

Here you go. Component values depend on the pull-up value and on the frequency of operation of the switch.

 

Last edited: Jan 14, 2018