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Linked image from external page, maybe you can host it on your server. It's showing a alternate GPIO 0 spot, no need to scrape off the green stuff.

gajotnt 2017-04-06 11:03:50 +00:00
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Hardware-Preparation.md

@ -65,10 +65,11 @@ I was unable to pair the Sonoff RF 434MHz receiver with any of my KaKu switches
### Sonoff Dual
<img alt="Dual GPIO0 grounded" src="https://github.com/arendst/arendst.github.io/blob/master/media/dual2a.jpg" width="230" align="right" />
<img alt="Dual GPIO0 grounded" src="https://github.com/arendst/arendst.github.io/blob/master/media/dual2a.jpg" width="230" align="right" />
<img alt="alternate GPIO 0 spot" src="http://tinkerman.cat/wp-content/uploads/2016/12/20161206_234331s.jpg" width="230" align="right" />
Programming the Sonoff Dual is more difficult as the on-board-button is not connected to GPIO0. Pulling GPIO0 to GND is needed to put the ESP8266 in programming mode during power up.
As always, you need to solder a 4 pin header for the serial interface (connector on the short end of the PCB). GPIO0 can be found in the small inter layer [via](https://en.wikipedia.org/wiki/Via_(electronics)) shown in the image. Using the GND pin from the button 0 / button 1 header connect the via during power up. Attention: If the via is covered by silk screen (green) you need to expose the underlying conductive (copper) by careful scratching.
As always, you need to solder a 4 pin header for the serial interface (connector on the short end of the PCB). GPIO0 can be found in the small inter layer [via](https://en.wikipedia.org/wiki/Via_(electronics)) shown in the right image. Using the GND pin from the button 0 / button 1 header connect the via during power up. Attention: If the via is covered by silk screen (green) you need to expose the underlying conductive (copper) by careful scratching. If you dont feel confortable with scratching the track to expose the copper, you can unscrew the dual and on the underside connect GND to the spot specified on the left image.
The 4 pin header in the middle, which is normally not present, is not needed but might be used in programming the ESP8266 as there must be a better way for itead to get the initial code loaded ...