Thanks a lot Isaac96, I have attempt that now, i got 3.5V from right and left pin, but only a few fluctulating milivolts on the backward pin! any idea why?
Right left voltage seem fine with arduino, but i am not sure about the current, do i need current limiting resistor? and i am sorry for the question but i do not know if the current limiting restores is normal one that we use with leds or is it a special one?
How i could achieve reading from backward pin?