Introduction - If you have any usage issues, please Google them yourself
Ultrasonic range-finder using AT89C52 12MHZ**** to adopt a total crystal Yang LED display LRM 2004.03.18********************************************* ranging scope of 7CM-11M, the stack in 4FH above, 20H for buffer unit showed signs in the 40H-43H, the use of memory 44H, 45H, 46H for calculating the distance