The PWM signal generated by ARDUINO UNO board is amplified through the amplifying steps built with the
optocouplers MB 104 in function of the moving direction of the conveyor belt, selected through the switch S2. The
program issued in LabVIEW 2013 for controlling the board ARDUINO UNO has the block diagram shown at Fig. 6
and the related front panel is shown at Fig. 7. The duty-cycle of the PWM signal may be modified through the Slide
2 located on the front panel of the program issued in LabVIEW 2013. The board ARDUINO UNO is controlled
from the computer, through the USB port. The PWM signal of the ARDUINO UNO board is transmitted through its
output, pin No. 10.