[GreenKeys] ESP8266 WiFi Module UART

[epvgk at limpoc.com]

On Sun, Jan 03, 2016 at 09:00:58AM -0500, Steve Garrison wrote:
> Eric, do you have the Digikey part number handy?  What was the price at the time you ordered?
> 
> Thanks!  May try a little microsurgery myself.
> 
> Steve G./N4TTY

The DigiKey item is 

https://www.digikey.com/product-detail/en/CP2102-GMR/336-1160-1-ND/3672615

They're $2.75 each, not that awful. 

The ebay module post-replacement looks like this: http://wtrc.net/~eric/cp2102.jpg

I used hot air to take off the old chip, cleaned off the glue with acetone, neatened
up the pads a bit with an iron, and didn't add any new solder or paste, just what
was already there from before. I preheated the board with hot air and then laid the 
new chip down, holding it in place under the air until the solder melted and surface 
tension settled it into position. 

eric


> 
> > On Jan 2, 2016, at 22:44, epvgk at limpoc.com wrote:
> > 
> > Regarding the cheapo 99c "CP2102" USB to serial modules we were talking about
> > last week: 
> > 
> > I ordered a few real CP2102 chips and did some microsurgery to remove the fake
> > chips that come with the modules and install real ones from Digikey.  They are a 
> > leadless and fine-pitch chip package, but the swap was not horrible, and it 
> > does work as expected afterward including using the SiLabs programming utility 
> > to set 600 and 1800 bps to 45 and 75 baud (which are all the teletype-compatible 
> > speeds I tried). 
> > 
> > Another amusing thing I noticed was that the real CP2102 chips show their serial
> > number as "001" and the fake ones are "31337001" 
> > 
> > anyway, it's possible and not that painful. 
> > 
> > eric. 
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