The inspiration is Mannkind ESPHomeRoombaComponent, that became deprecated due to dependency updates.
In addition I did not want the Roomba device to communicate over MQTT, it instead registers a service call for commands, and expose sensors through roomba.yaml.
Using the brc pin we get the following:
Alternatively using the IR led:
*Depending on your Roomba model, you might be unlucky as me and have a bug that does not allow the device to wake from brc pin when it goes into passive mode during trickle charging. To circumvent this I copied my code from a previous general controller I had stationed in the kitchen for 433mhz and IR controlling that sends the start code with and IR led to the roomba, it need a clear sight of the roomba IR sensor over a short distance.
If you need this, uncomment the remote transmitter switch section in the roomba.yaml and use the switch to wake and clean.
The Wemos D1 mini is small enough to fit into the compartment by one of the wheels. But using a esp-01 or esp-12 series and some single braid wire I have managed to fit it all under the top lid without bulging or deformeties, the only visual defect is my led that is pointing at the IR reciever.
Copy the contents of the ESPRoombaHomeComponent.h and example/roomba.yaml into your esphome config folder, change accordingly.
Flash onto new device and connect circuit.
Besides the obvious, connecting your vacuum to your automation system, it also does so completly inside a private and controlled ecosystem. As I was about to replace this unit due to the "hacky feel" of using the IR led, as the unit was shipped bugged and there's not a high availability of create cables for a patch, but all other solutions had me locked into a proprietary system such as mi home, or tuya with smart life; sure there are roundabout ways of both interfacing with them through Home assistant etc, and do so locally. They all seemingly lacked the future proofing and control I wanted. With this setup there is nothing really stopping you from a full on LiDar setup and room control!