ultrasonic with pic16f84a

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mecha4

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hi all, i need help to get a programe for pic16f84a to programe ultrasonic srf05 to use the sensor in blind cane to detect obisticle, sorry for my bad english.
 

i dont have circuit but i want the program to generate a pulse for ultrasonic sensor first then when iam know the range i will build circuit
 

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