Author Topic: Driving relays from PIC!!  (Read 2842 times)

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Offline sambhavTopic starter

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Driving relays from PIC!!
« on: February 10, 2007, 01:01:34 PM »
hiii
i m using PIC 16f877 for my project...
i m using relays in order for switching which are driven
by the PIC outputs.
since the logic 1 for a PIC is 4.3 - 5v with a max current of 25ma
will it be possible to drive relays using such low curr.. if yes.. please ggive me the relay number and other specifications..
i dont want to use amplifiers as it wud add to the circuit complexity..
thanx..

Offline Hal9000

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Re: Driving relays from PIC!!
« Reply #1 on: February 10, 2007, 01:53:28 PM »
Hey there,

I'm sorry if I confused anyone before about the relays that could be driven by the PICs. I haven't tried byself, but i'm sure it's in one of my books............

However, a quick search on google suggested a quick and easy way of doing what you want to do.

http://www.mikroe.com/en/books/picbook/7_05chapter.htm

http://www.technologystudent.com/pics/outin1.htm

You can see, this idea is also used for motors and is the basic idea behind simple H-bridge circuits.

Hope that helped :)
"The truth is, you can't hide from the truth, cos the truth is all there is" - Handsome Boy Modeling School

Offline Admin

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Re: Driving relays from PIC!!
« Reply #2 on: February 11, 2007, 03:49:52 PM »

Offline Hal9000

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Re: Driving relays from PIC!!
« Reply #3 on: February 12, 2007, 03:39:26 AM »
But then, it depends what you need the relays for. FETs instead of Transistiors, don't you mean?
"The truth is, you can't hide from the truth, cos the truth is all there is" - Handsome Boy Modeling School

Offline Hal9000

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Re: Driving relays from PIC!!
« Reply #4 on: February 15, 2007, 03:40:00 AM »
Oh right, sorry, driving the relay from the MOSFET. I see.
"The truth is, you can't hide from the truth, cos the truth is all there is" - Handsome Boy Modeling School

 


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