The Design of Pulse Signal Collection Based on MCU
Abstract:With the development of electronic technique, MCU general app1ies to the instrument field owing to the small volume,the strong function,the low power .And because of eximious cost performance the applications of LED display is expanding day by day in recent years, more and more electronic equipment in the display device to use it.According to the principle of practical, reliable, safety, facility and economic, we designed and researched the project of pulse signal collection apparatus base on 8051: Conditioning the pulse signal from the sensor, ensuring the quality and range of the obtained pulse signal. It designs simulate switching circuit using ADC0809 and controls A/D conversion using MCU, and then the pulse signal is sent into LED. Because MCU output TTL electricity,we designed a common RS232 electrical level conversion circuit in the communication course of MCU and computer, the conversion circult can transmit the data between the RS232 and TTL electricity. The system has data acquisition, data processing, communications, anti-interference, real-time display performance, and make it pulse, blood pressure testing to achieve intelligent, and it has a small ,high precision, fast response and good stability characteristics. The device has some important application value and practical significance.
Key words: 8051 MCU; LED; ADC0809; pulse signal