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Updated Sonoff 4CH (markdown)

Thomas Dietrich 2017-06-24 01:24:26 +02:00
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Sonoff-4CH.md

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## Solving OTA and upload problems
* Itead Product Page: http://sonoff.itead.cc/en/products/sonoff/sonoff-4ch
* Itead Shop: https://www.itead.cc/sonoff-4ch.html
* Itead Wiki: https://www.itead.cc/wiki/Sonoff_4CH
Other than most Sonoff modules (ESP8266) the Sonoff 4CH is based on the ESP8285.
## Serial Connection
Please see the [Hardware Preparation](https://github.com/arendst/Sonoff-Tasmota/wiki/Hardware-Preparation) page for general instructions.
As always, you need to access the serial interface. The **four serial pins** (3V3, Rx, Tx, GND) can be seen in the first picture. *Attention:* The printed labels on the PCB for Rx and Tx are incorrectly swapped.
The Sonoff 4CH features four hardware buttons of which one is already connected to GPIO0, which hence can be used to bring the module into [Programming Mode](https://github.com/arendst/Sonoff-Tasmota/wiki/Hardware-Preparation#bringing-the-module-in-flash-mode). The button is shown on the second picture.
<img title="Sonoff 4CH serial connection pins" src="https://github.com/arendst/arendst.github.io/blob/master/media/sonoff4ch_pins.jpg" width="48%" />
<img title="Sonoff 4CH GPIO0" src="https://github.com/arendst/arendst.github.io/blob/master/media/sonoff4ch_gpio0.jpg" width="40%" align="right" />
## Solving OTA and Upload Problems
Where most Sonoff's are ESP8266 based the Sonoff Touch and Sonoff 4CH are based on the ESP8285.
It is important to initially flash these devices with the correct FlashChipMode of DOUT as otherwise future OTA or Upload updates will fail.