Relay interfacing with 18F4520

paddy_p · Mar 16, 2013

Hi,

Greetings of the day!!!!!

I have to interface relay with PIC 18F4520 micro controller.

Coil voltage of relay is 5V. So is it okay if I use common 5V supply for micro controller and relay coil or I need to use another supply for relay coil to get an isolation?

Please suggest.

Thanks
Paddy

tpetar · Mar 16, 2013

Use ceramic 100nF near +/- pins of uC, use flyback diode for relay :

**broken link removed**

jayanth.devarayanadurga · Mar 16, 2013

Why do you need isolation? What are you switching with relay?

paddy_p · Mar 16, 2013

Thank you very much tpetar and jayanth.devarayanadurga for your quick reply.

Actually I just want to provide potential free contacts and switching application is user dependent.

Is there any chances of damage if I am switching any high voltage load??

Please suggest.

jayanth.devarayanadurga · Mar 16, 2013

No there is no damage if relay is used. The load will be isolated from MCU board but you have to choose proper relay ratings for the load being switched.

paddy_p · Mar 16, 2013

Okay.

Thanks a lot for the advice!!!

Relay interfacing with 18F4520

paddy_p

Member level 2

tpetar

Advanced Member level 7

paddy_p

jayanth.devarayanadurga

Banned

paddy_p

Member level 2

jayanth.devarayanadurga

Banned

paddy_p

paddy_p

Member level 2

Similar threads

Relay interfacing with 18F4520

Member level 2

Advanced Member level 7

Banned

Member level 2

Banned

Member level 2

Similar threads

Privacy & Transparency

Privacy & Transparency