AVR-Chat

At 09:57 PM 8/11/2004, kc9dag wrote:

>> I think the problem is there are not enough current to 
>> drive the relay. 
>
>oops, posted the wrong schematic... mine was still wrong, but I did 
>have the transistor...  The one I ment to post is 
>http://www.dpicts.com/Tiny15L-LaserDetector-2.jpg  which has the 
>NPN, but I hooked up the transistor the way it is shown on page 3-2 
>of the STK500 manual...
>so after everyones advice I have changed the schematic to 
>http://www.dpicts.com/Tiny15L-LaserDetector-fixed.jpg    I didn't 
>add the diode as someone suggested b/c I am actually using a solid-
>state relay (an Laa110)... 

An SSR may still have a coil, with a small relay activating a large triac.

Also, I'd still reccomend the 10k pulldown on the tiny's output pin, Otherwise, you have an excellent RF detector connected to your relay, whenever the uP is in reset.