First off ... I am brand new to electronics & Arduino and so I'm just bouncing ideas around inside my head at the moment hoping that they'll work (my understanding should kick in soon as I work my way through my Arduino for dummies book :) )
I'm planning on creating an Android Car PC based off the Udoo Quad (www.udoo.org) which essentially has an Arduino Due stuck on top.
What I'd like to do (and need help with) is be able to control which of two audio sources is passed through to the car's aux input (either audio from the Udoo or from a bluetooth handsfree). Both inputs and the output will be 3.5mm audio line-level, so from what I understand, I can just use a DPDT relay to switch between input 1 and 2. Basically - the same as http://solderintheveins.co.uk/2009/12/simple-audio-switch/. Using the Android ADK, it'd just be setting the control pin to be HIGH/LOW depending which source I want (that's the easy bit!).
However ..... the above solution assumes a 5v circuit ... but the Due only has 3.3v coming from the pins and so the relay would never trigger - so how can I get the 5v relay to work with my Due?
Once again, sorry for the nooby description, I'm learning as I go :)
Thanks in advance! Mike