Track projet

Hi all, after have made my chronometer, i would like it to fire when the item passes on the LTH 301 32 : http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CGoQFjAA&url=http%3A%2F%2Foptoelectronics.liteon.com%2Fko-kr%2Fapi%2FDwonloadFileHandler.ashx%3FtxtSpecNo%3DDS-55-96-0005&ei=TzCpT5uCJKOh0QXl--iVBA&usg=AFQjCNEaHW_fu0hYPGf_-HOwGhrHHNUFgw&sig2=1HYjTKErvY564_hbpx2OKg (sorry for the long url website)

I make the connections but nothing happens, i have put : - for the led : resistance 220 ohm, 5V - for the phototransistor : resistance 4.7kOhm + 5V and an OUTPUT after the resistance

I don't know what happen, maybe my components are died ?

Thanks a lot

I have found a solution, don't use digitalRead() but analogRead() and after I try to change the resistance value to see what's the most