On a Design of Ultra-Low Power Infrared Communication Device and Repeater

Key words: 
• common-emitter stage amplification，PFM modulation，low power consumption，infrared opti-cal communication /
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Abstract: By means of the separation of components ,and taking the STM32F103ZE microprocessor as the control core ,an infrared optical communication device and three‐dimensional ultra‐low power repeaters have been designed ,contributing to the wireless transmission and the transponding in any directions while transmitting the digital or analog signals .The entire device consists of an infrared light emitter ,a three‐di‐mensional repeater and a infrared optical receiver and so on .It can achieve the purpose of digital wireless communications ,and make up for the single directional transmission defects of the optical communication by means of a synchronous transmission protocol and the demodulation of PFM modulation .It has the ad‐vantages of the low power consumption and the long‐distance transmission .With the audio transmission as the prototype ,transmit audio signal within 0.1-10 kHz band in three‐dimensional space of about 12 me‐ters in real time .