BIGTREETECH EBB Gen 2 36/42 Can Bus U2C V2.1 toolhead boards

BIGTREETECH EBB Gen 2 36/42 Can Bus U2C V2.1 toolhead boards Note: Ebb36 is currently a preorder expected to ship from batch 2 around first week of december.  EBB 36/42 Can Bus Features With BOOT and RESET buttons reserved, users can update the firmware via DFU mode by USB. Added protection circuit on the thermistor avoids burning the main control chip caused by leakage current from the heating rod. Users can select the thermistor's pull-up resistor values through a jumper wire, so as to support PT1000 (2.2K pull-up resistors), which makes it convenient for DIY. Connect the USB with a jumper cap to get it powered on, which effectively isolates the main control board DC-DC from USB 5V. Reserved I2C interface allows for filament broke and clogged detection, and supports other DIY functions. Added anti-flyback diodes on the heating rod and fans' ports effectively protect the MOS tube from being burned due to reverse voltage. Anti-reverse connection protection on the power in