sense obstacle in path...
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Step 1: Material Required
1-piece of small wooden slab
some wire for connection
some adhesive ....to fix sensor's
Step 2: Fixing of Photo Sensor
fix the photo sensor in front of led.. as in pic with help of adhesive on wooden slab
Step 3: Connection
connect the photo diode, led,and battery in forward biased.
Step 4: Now Your Photodetector Is Ready
whenever you you put any thing between photodiode and led ....
the led will automatically turn off due to intruption in light..... photodiode conductivity depends on intensity of light..
sorry for any mistakes ...
I can't be able to explain it's ...process