If you have ever tried to use a third party serial module to send info to an ardueno you may know that generic $1-4 adapters on eBay just don't wok, unless you press the reset button at the perfect time during upload. Or you have gotten this error below that basically means i could not talk to anything that looks like an ardueno boot loader. 

"avrdude: stk500_getsync(): not in sync: resp=0x00"

However they is a very easy fix to that problem. When the serial chip in most usb modules are accesed/programing starts it flips DTR and CTS. The arduneo and this mod both use that to trigger a reset of the ardueno, easy way to take advantage of this is a small cap that is used to allowe only ac aka changing voltage to get past it, triggering the arduneo when inital connection is made to the serial module.

So anyways, How to mod a CP2102 usb to ttl adaptor with a .1uf cap

Here is the seller I got it from.

http://www.ebay.com/itm/251336835653?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

Useing a though hole .1uf capacitor 

Using an SMD805 .1uf capacitor.