By researching the usual lose problems of field exploration, this paper puts forward and designs an effective personnel help device for tour pal to send help signal to teammates or rescue people. This device comprises a power supply, a temperature and humidity sensor, a GPS positioning, electronic compass, a 433MHz communication module, an OLED display and a micro controller module. This system uses the STM32 series ARM microcontroller with C language programming. It greatly educes the danger coefficient of the field exploration, and the cost of search work of the human, material and financial resources in the field.
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