Aiming at requirement for design of multi-depth soil temperature sensor node

present a binary tree search algorithm.The algorithm recognizes sensors which connected to single node by 1-bus and reads the acquired temperature.The sensor node has features of low power consumption and single processing function

so the algorithm adopts recursive method to make the code concise and compact.Theoretical analysis and experimental results demonstrate feasibility and effectiveness of the algorithm.This design will be widely applied in actual production and life

under application background of wireless sensor networks（WSNs） development.