基于STM32的便携式微生物微弱光探测器设计OA

Luminescence characterization is one of the commonly used methods in microbiology research,and microbial luminescence is usually faintly invisible,making microbial weak light detection pivotal in assisting microbial research.In order to meet the requirements of miniaturization of microbial luminescence detection instruments,a photoelectric signal acquisition system is designed with the STM32 chip as the main controller.The system collects weak light signals through a pair of integrated SPD chips,i.e.,OPT301M,and adopts 16-bit SAR analog-to-digital conversion chips,i.e.,LTC1865,to achieve high-precision signal sampling even under extremely low light conditions.Signals are then transmitted based on the Modbus RTU protocol and undergone CRC verification before being sent to the self-developed host computer for processing,display,and data export.Additionally,the system adjusts the multi-channel control switch,i.e.,CD4051BM,in the host computer according to the light intensity.The results of experimental test demonstrate that the microbial weak light detector can detect and output microbial photoelectric signals in real time,and can adaptively respond to the gain switching under changes in light.This capability is consistent with the image detection results of microbial luminescence and demonstrates high accuracy and sensitivity.