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R3

Michael Ingraham 2019-07-02 11:04:30 -04:00
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Sonoff-Basic.md

@ -21,14 +21,16 @@ If your switch is powering up but is showing a solid-blink-reset pattern see [th
* GPIO01 - TX PIN
## Sonoff Basic R3
This is the board layout for the third design iteration of the Sonoff Basic. This version of the device supports the new Itead DIY architecture which allows OTA firmware upload (support for OTA upgrade to Tasmota to be confirmed). The Sonoff Basic R3 uses the ESP8255 chip. With this version, the mains power reverts to solder rails directly on the PCB. It also moves the Wi-Fi module to a separate PCB mounted on the main PCB. It makes access to the serial pins quite difficult. The device was reviewed by DigiblurDIY in [this video](https://www.youtube.com/watch?v=A-WcIz47Lco).
**Sonoff Basic R3 available GPIO**
This is the board layout for the third design iteration of the Sonoff Basic.
![](https://user-images.githubusercontent.com/34340210/60516116-13615f80-9cab-11e9-914b-d9509d6bbe20.jpg)
The Sonoff Basic R3 uses the ESP8255 chip. With this version, the mains power reverts to solder rails directly on the PCB. It also moves the Wi-Fi module to a separate PCB mounted on the main PCB. It makes access to the underside of the serial interface contacts quite difficult.
### Sonoff Basic R2
This version of the device supports the new Itead DIY architecture which allows OTA firmware upload. The process for performing an OTA update requires access to a jumper on the PCB (i.e., inside the case) and further Wi-Fi hotspot and app configuration. The device was reviewed by DigiblurDIY in [this video](https://www.youtube.com/watch?v=A-WcIz47Lco).
The serial interface pins are broken out on the PCB making flashing using a serial adapter considerably simpler than the Itead OTA process. Since the underside of the contacts is not easily reachable, use a solderless solution (i.e., friction) to maintain contact with the pins to flash the device.
## Sonoff Basic R2
Around November 2018, Itead changed the layout of the Sonoff Basic ([issue #4515](https://github.com/arendst/Sonoff-Tasmota/issues/4515)). The new board is labeled as **Sonoff RF R2 POWER V1.0**. It is easily discerned from previous revisions since it uses wires instead of thick solder traces for mains power.
The new version of the Sonoff Basic smart switch uses an ESP8285 SoC with the 1MB flash integrated into the same SoC chip.