[GreenKeys] ESP8266 WiFi Module UART

[Eric]

On 01/03/2016 12:03 pm, COURYHOUSE at aol.com wrote: 

> How much is the card with the good chip already on it!? 
> Ed#

It's $36 - http://www.silabs.com/products/interface/Pages/CP2102EK.aspx
[1] 

The main difference for me is the bulk, rather than the cost. I don't
need the RS232 voltage level conversion stuff since it's just connecting
right to optocouplers to connect to the tty loop, so the small module is
more convenient. 

> In a message dated 1/3/2016 1:01:13 P.M. US Mountain Standard Time, epvgk at limpoc.com writes: 
> 
>> 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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Links:
------
[1] http://www.silabs.com/products/interface/Pages/CP2102EK.aspx
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