Created Flash Sonoff using Raspberry Pi (markdown)

Flash-Sonoff-using-Raspberry-Pi.md

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+If you have no USB-to-TTL serial converter available, but a Raspberry Pi, you can use this for flashing your Sonoff switch.
+
+All is basically described here, but it is a little outdated:
+https://www.sigmdel.ca/michel/ha/sonoff/flashing_sonoff_en.html
+
+So, I will summarize the process and needed adoptions based on the above blog, please refer there for a more detailed explanation ;)
+
+# Preparation of the Raspberry:
+1. Install esptool (pip needed) 
+`sudo pip install esptool`
+
+2. Prepare serial connection
+(This is adopted for RaspberryPi 3, before it was ttyAMA0)
+`sudo systemctl stop serial-getty@ttyS0.service`
+`sudo systemctl disable serial-getty@ttyS0.service`
+`sudo cp /boot/cmdline.txt /boot/cmdline.bak`
+`sudo nano /boot/cmdline.txt`
+-> delete "console=serial0,115200" option
+
+3. I don’t know if this is necessary, but I did it as it was mentioned here: https://spellfoundry.com/2016/05/29/configuring-gpio-serial-port-raspbian-jessie-including-pi-3/
+`sudo nano /boot/config.txt`
+-> add the line (at the bottom):
+enable_uart=1
+
+4. Wire RaspberryPi:
+https://www.sigmdel.ca/michel/ha/sonoff/flashing_sonoff_en.html
+![Wiring](https://www.sigmdel.ca/michel/ha/sonoff/img/sonoff-rpi.jpg)
+(For RaspberryPi 3 (40 GPIO pins) GND is the last pin on the left, the 39th pin.)
+
+5. Erase flash memory:
+Connect 3,3V while button pressed to enter flash-mode:
+`esptool.py —port /dev/ttyS0 erase_flash`
+
+6. Flash .bin, which you can download from the release-section of this git:
+Again connect 3,3V while pressing button:
+`esptool.py —port /dev/ttyS0 write_flash -fs 1MB -fm dout 0x0 /path/to/sonoff.bin`
+
+7. Setup Wifi:
+`miniterm.py /dev/ttyS0 115200 -e`
+ssid _yourSSID_
+password _yourPassword_
+
+That’s it :)
+Feel free to edit, if I forget something or changes are necessary in the future!
+
+Sources:
+https://github.com/arendst/Sonoff-Tasmota/wiki/Esptool (flashing commands)
+https://spellfoundry.com/2016/05/29/configuring-gpio-serial-port-raspbian-jessie-including-pi-3/