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https://chihaukam.blogspot.com/2024/10/httpschihaukam_29.html . Ref: https://wodewangzhishime.blogspot.com/2023/12/blog-post.html?m=1 . . Me: R0 ,R1, R2 are the physical address of the radio receivers. . . John: The more far from the radio emitter , the weaker the signal. . Ok. The distance between radio emitter and R1 or R2 are samely 2 meters. Why R1's signal is much weaker than R2?? Me: Because, R1 is at 45 degree of angle. On the contrary, R2 is at 90 degree of angle. John: Ok. R1 and R0 have same signal's weakness . How do I know where they are located ??. . The emitter send a signal to R0 and R1, and , wait until they echo. . 1) R0 need 3 second to echo. R0 is more far from the radio emittor. 2) R1 need 1 second to echo. R1 is more near the radio emittor.