This HDMI to VGA cable can enable you to use pcDuino with a monitor with VGA only interface. Moreover, there is also audio output.
See this cable in action:
2 Reviews Hide Reviews Show Reviews
This unit is very nicely engineered. It is white, in keeping with the common trend now a days. I don't care much about color but it looks very nice. The best things about it are the length of the cable and the access to the audio. You even get a small 3.5 mm male to male cable. I especially like where they located the audio jack -- it lines up with the video cable -- NOT out the side as some do! THIS IS THE ONE to buy.
I had no problems with this adapter using the pcDuino3B and Nano. I have not tried it on the pcDuino3S yet but I am sure it will work fine.