This module can be utilized to change over the RS232 voltage of PC to TTL voltage that utilized by microcontroller. Straightforwardly plug the DB9 connector your PC then you can speak with the microcontrollers utilizing the Serial port. It is relevant to an assortment of stages including Arduino/AVR/ARM. For Arduino, if it’s not too much trouble, likewise note that there is as of now a UART2USB association, you simply need this module on the off chance that you need more sequential association with your PC.