&gt; Has anyone used the GPIO lines on a URI to active a 12 volt DC fan when the PTT is active?<br>
&gt; I have a friend that who wants to implement this on his All-star node to keep his transmitter cool.<br>
&gt; I guess that we would need to use a relay with the GPIO line to protect the URI?<br>
&gt; Any thoughts or suggestions?<br>
&gt; Marshall - ke6pcv<br><br>Marshall,<br><br>I had the same idea and I contacted David Kramer at DMK Engineering (makers of the URI).<br>He responded with this link on how to do exactly what you want;<br><br><a href="http://www.dmkeng.com/images/GPIO_Relay.pdf" target="_blank">http://www.dmkeng.com/images/GPIO_Relay.pdf</a> <br>

<br>I tried it and it works great....<br><br>73,<br>Neil<br>WA5JXY<br><br>