[BILAL sadiq]

hi every one  i have question

 

i am using IR led As transmitter and photo transistor as reciever

 whein IR is falling on phototransistor nothing is happen (which i actually want)

 

but when some one passes (break the LED light from IR on to Phototransistor)

 

 

i have 

 

IR —> phototransistor—-> 2n2222 —-> an indicatng LED at its collector —-> which is then send to LM339 -ve (inverting) terminal—-> then +ve terminal of :LM339 is then fed (with pull up) to P1^0;

 

but problem comes over here…

 

initially the LM 339 output is generating 0V (but with my DMM it is actually showing 1.76V)

then when some one passes LM339 generates 5V (buti with my DMM it is 5.56V)

 

problem is controller starts incrementing automatically

where i want is that when some pass then controller increment by one

and so on till 99

 

PLEASE HELP TO PUT DATA FROM LM339 OUTPUT TO P1^0 TO PERFOM FUNCTION

 

 NEED URGENT HELP 

REGARDS

[BILAL sadiq]

hi every one can some one help me please
i do not know how to connect 12V supply for my dc motor with 5v microcontroller 8051 ,,,i mean to say in hardware what should i do ???? should i use LM7812 or how ,,,,,please do help me ,,,,,what and how i manage to run a 12V dc motor with 8051 microcontroller,,,i know the theory(about L293D) but on hardware how can i get 12 V ???
please help me and especially guide me please 
waiting for nice advices and help …
thanks

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