Update OpenDTU-OnBattery/docs /hardware_flash.md

[Manos1966]

Is your feature request related to a problem? Please describe.

https://github.com/helgeerbe/OpenDTU-OnBattery/blob/development/docs/hardware_flash.md#mcp2515-can-bus-module

says:

MCP2515 CAN bus modules that are widely available are designed for 5V supply voltage. To make them work with 3.3V / the ESP32 a modification is required. This modification is described here.

Describe the solution you'd like

Add to the text, that there are ready modules available:

MCP2515 CAN bus modules that are widely available are designed for 5V supply voltage. To make them work with 3.3V / the ESP32 a modification is required. This modification is described here.
If the above is too complicated, a (more expensive) version of this with two voltage inputs is also available, the Joy-IT SBC-CAN01 which requires no modifications. CANbus communication with OpenDTU

Describe alternatives you've considered

No response

Additional context

No response

[schlimmchen]

Copy the hardware_flash.md to a new and appropriate Wiki page and let me know. I'll then create a MR to update that file to point to the wiki instead.

[Manos1966]

Hi @schlimmchen Bernhard,

es ist hier https://github.com/helgeerbe/OpenDTU-OnBattery/wiki/Huawei-AC-PSU#canbus-communication-with-opendtu

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