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moved content from Hardware Preparation

Andreas Hubel 2017-11-29 19:50:38 +01:00
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Sonoff-RF.md

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## Serial connection
The Sonoff RF needs some tweaking as the connection needed during programming between the button and GPIO0 might not be present.
[Phalox](http://phalox.be/wp/electronics/itead-sonoff-slampher-custom-firmware-fix/) explains the case with a picture where you have to install a jumper wire for R21. I received the same result using a small screwdriver and shorting both solder pads of R21 while holding down the button during programming.
<img alt="S20 Smart Socket" src="https://github.com/arendst/arendst.github.io/blob/master/media/sonoffrffix.jpg" width="230" align="right" />
Pairing the iTead RF remote controller is the same as with the original iTead software:
- two short button presses will blink a red led shortly and start RF signal recognition. Three longer blinks signal RF reception.
- three short button presses will keep the red led on for some seconds and erase the known RF code.
I was unable to pair the Sonoff RF 434MHz receiver with my KaKu switches but the iTead provided remote control works just fine.
## Pairing a RF remote control
During programming a connection for R21 is needed in order to use a button press to ground GPIO0.