Perhaps, I see the OT1 & OT0
The strange is the Power, somewhere it say s 5V, but I see on the pads 3V.3, CLK, DIO, GND… , so maybe both.
the pins at the bottom are different
VCC (5V), GND, OT1, RXD, OT2
One may be a reset ? and used to sync up the response?
I see a grove connector, so maybe I2C also
, scratch_that I see now,GND, D+ , D-, VCC on the silk screen