Uln 2803

you now talking with nonsense, my comments stops here .

hi Elecman,
Did you connect the ULN 0V pin to the 8051, 0V power supply pin.

Without that common 0V link the 8051 cannot drive the ULN's internal transistors.
The common is essential for the circuit to work.

Lets know how it goes.
 

agu,
Please stop hijacking technical threads with your ramblings about religion, politics, sex, school kids and third world countries.
If you want to get a point across start a suitable thread.
 
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