miniflash

Perl script for flashing the Sonoff mini in DIY mode based on the tutorial by Andreas Spiess

Background

The Sonoff mini comes with a DIY mode that supports flashing an own firmware (e.g. Tasmota). This mode is somewhat difficult to handle manually and tools are only available for Windows, so I created this little helper script.

Preconditions

You need:

• a Sonoff mini with an original firmware 3.1.x or higher,
• Perl and perl-libwww,
• an access point (e.g. wifi guest network) with SSID sonoffDiy and password 20170618sn,
• a webserver in your local network with the new firmware,
• the tools avahi-browse and curl have to be installed.

Procedure

1. The wifi network and the webserver have to be started.
2. Open the Sonoff mini, set the OTA jumper.
3. Connect power, wait some seconds util the mini connected to the network.
4. Execute the script with the firmware URL where you stored your new firmware on your local webserver.

Note

The firmware has to be either tasmota-wifiman.bin, which starts a wifi access point for configuring your wifi credentials or a self compiled binary with those credentials compiled in. I prefere the second method because it saves a step of work and compiling Tasmota is rather easy thanks to platformio.