Wemos Release

As a convenience for users with older hardware, the firmware is released additionally for a Wemos C3 mini.

This way, by getting such a cheap item and plugging it onto an adapter v3.1/v3.0/v2.x, the benefits of the ESP32C3 architecture and the adapter firmware can be used.

In order to use it on a v3.1/v3.0 adapter, it’s PIC needs to be put into “non-enhanced USB/RPI/WIFI” mode so that the ESP32C3 can take over eBUS communcation completely.

For v3.1, the Wemos should also be configured to set pin D0 to L so that the USB serial converter on the adapter is turned off. This is as simple as going to the pins page and setting the function of pin D0 to “Output (fix L)”.

Flashing via web browser

The following steps need to be carried out for flashing the firmware by using a web browser supporting Web Serial:

  1. connect the adapter via USB, press and hold the IO9 button (not the reset button), then shortly press the reset button, and finally release all buttons (forces bootloader mode)
  2. pick the desired version and click on "CONNECT":
    Select one of the options above first!
    Installer powered by ESP Web Tools.
  3. pick the serial Port "USB/JTAG serial debug unit (COM...)" and click on "Connect" (e.g. on Windows)
  4. click on "INSTALL ..." and follow further instructions

If the adapter was flashed for the first time, the reset button needs to be pressed once in order to exit bootloader mode. If you want to make the WIFI settings right away, the connection of the flash tool must also be renewed, i.e. exit the dialog completely and re-establish the connection via “CONNECT”.

In case the dialog does not show options for configuring the network (“CONNECT TO NETWORK” or similar), it might be necessary to wait 10 seconds, go to “LOGS & CONSOLE”, and click on “BACK” there, in order to get the communcation ready.

The connection to your own WIFI can be established via the dialog via “CONNECT TO NETWORK”. Available networks are scanned and offered for selection. If the connection works after entering the optional password, the access data is also saved.

Afterwards the website of the adapter is shown by using the entry “VISIT DEVICE”. Alternatively the easi> Interface is available for configuration via “LOGS & CONSOLE”.

After initial flashing and also by pressing the button during boot, the firmware starts a WIFI access point with SSID “EBUS” without a password. When connecting to that one, the most important settings can be adjusted on the page