微小电容检测系统的设计及应用

针对在微小电容的检测中，传统模拟电路存在设计复杂，电容测量范围小等诸多局限性这一问题，设计了一种微小电容检测系统。该系统硬件主要由电容测量芯片Pcap01、单片机STM32F103C8T6最小系统、供电电路以及LCD液晶显示屏构成。系统软件包括下位机的C程序，实现了电容数据采集、Pcap01 AD与单片机之间的通信以及数据转换。实验结果表明，该系统结构简单，精度高，误差小，稳定性好，抗干扰能力强。能方便的应用于需要微小电容检测的场合，如电容式液位传感器等。

Design and application of micro capacitance detection system

In the micro capacitance detection, the traditional analog circuits exist many limitations, such as the complex design, small capacitance measurement range. To solve these problems, a micro capacitance detection system was designed. This system consists of capacitance measuring chip Pcap01, the STM32F103C8T6 minimum system, the power supply circuit and the LCD display. The software of the system, including the C program of lower computer, realizes the function of collecting the capacitance data, communicating between Pcap01 AD and the MCU and converse the data. Experimental results show that the system has simple structure, high precision, small error, good stability, and strong anti interference ability .It can be easily applied to the situations that require micro capacitive sensing, such as capacitive level sensors, etc.