Hi there,
the J3 and J4 are connected to the same signals. So we can connect led1 J2(DO,DCKO,VCC,GND) to led2 J3(DI,DCKO,VCC,GND) and connect led1 to Seeeduino.
you also can connect the led1 J3(DI,DCKO,VCC,GND) to led2 J4(DI,DCKO,VCC,GND) and connect led1 to seeeduino. the led bars will display the same info. thanks.
Bill