SAFTY WARNING: DISCONNECT MAINS POWER, WHEN MAINS POWER CONNECTED COVERBOX MUST BE CLOSED!
How to flash Tasmota firmware to Sonoff basic:
I use a FT232RL 3.3v-5v TTL USB Serial Port Adapter.
Solder pin headers onto the PCB.
Imortant: TTL USB Serial Port Adapter must be set to 3.3V and don't connect the Sonoff mains power!
Connect the Sonoff to the FT232RL.
Download ESPEasy flashtool.
Download Tasmota Firmware, choose release and download the language you prefer.
Download Termite RS232 Terminal Complete setup version.
Unpack ESPEasy flashtool, Tasmota firmware and Termite to the same map.
Discover your FT232RL COM-port.
Open Command Prompt.
Remember your FT232RL COM-port.
Go to the directory with the ESPEasy flashtool.
Chose the FT232RL Com-port and select the Tasmota flash file.
Put your Sonoff basic device into flash mode:
(1)UNPLUG your FT232RL from your computer. (2)Press and hold the push button on the Sonoff board. (3)while holding the push button insert the FT232RL in your computer. (4)After 3 seconds, release the push button.
Now click Flash.
Reboot the Sonoff device to Unplug the FT232RL from your USB and re-connect USB.
If your connection doesn't work check in Settings that your COM-port and connection speed:
Data bits: 8
Stop bits: 1
Flow control: None
Important: Commands are Case Sensitive
Enter your SSID in my case: sonoff-test
Enter your wifi password in my case: test1234
Now your Sonoff is connected to your wifi network
Gif your Sonoff a static IP
IP Address in my case 192.168.2.144
Gateway in my case 192.168.2.254
Subnetmask in my case 255.255.255.0
DNS in my case 192.168.2.1
Restart the Sonoff
Your Sonoff is ready for use.
Open your browser and connect your Sonoff, in my case 192.168.2.144 (IPAddress1)