AVR-Chat

Basically, you need to put a resistor inline with your port pin to limit
current to the LED input of the SSR (solid state relay).  You can get by
with 5 or 10 mA nicely :)  Gotta figure your voltage drop across the port
and also the LED in the SSR which is about 1.2 volts forward drop.  Then
calculate a resistor for the remaining voltage to limit to 5 or 10 mA.
Normally, I connect my LEDs to Vcc and sink to the port.

 

Barry AKA JoeLlama

 

 

 

-----Original Message-----
From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf
Of John Samperi
Sent: Sunday, February 25, 2007 5:43 PM
To: AVR-Chat@yahoogroups.com
Subject: Re: [AVR-Chat] attiny12

 

At 02:15 AM 26/02/2007, you wrote:
>Can somebody tell me if I can drive a solid state relay directly from
>the tiny12 or I need a transistor.

The i/o pins can supposedly drive 20mA, how much current does the
solid state relay need to work?

Regards

John Samperi

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