project timer closing monitoring system by satputeashish123

[query]

 

i am working on project timer closing monitoring system which is basically

targeted to construct for racing purpose,hence includes interfacing sensors directly

to 8051 mc and there are 4 lanes ,so i have problem how to program sensors which are

giving digital o/p directly to mc without using ADC….also timer of controller will

be interrupted by sensors.till that timer must go on…please suggest its urgent

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