Hello, I am a Mechatronics Engineer, ready for your job sir, using latest software of pcbs making like EagleCad, Proteus and Altium, Do you need it a normal Pcb or double Layer or as Arduino Shield or microcontroller integrated in it, to be sure it will be ready before the 3 days, but 3 days is enough for discussions, Thank you, hope to win the job, and don't pay till it finished, Thank you.