论文部分内容阅读
一、电子人体秤的设计原理人站在秤盘上,装在玻璃秤盘下的小压力传感器,将重力转换为电压的模拟信号,经放大器及滤波处理后由A/D处理器转化为数字信号,数字信号由中央处理器(单片机CPU)运算处理,去皮重,算出净重,最后由显示屏以数字的方式显示30s,然后CPU进入休眠模式。二、硬件设计1.电源采用3.3V的纽扣电池供电,CPU需要3.3V和1.8V,通过DC-DC电源芯片LM1117-1.8V从3.3V转化获得1.8V。根据低功耗设计原则,需要对系统电源进行合理控制和管理。系统电源在上电状态下,当空闲时,单片机STM32F101T8进入休眠模式,当检测到需要称重时则唤醒进入工作模式。
First, the design principle of electronic body scale People standing on the scale pan, mounted on the glass pan under the small pressure sensor, the gravity is converted to analog voltage signal by the amplifier and filter processing by the A / D processor into digital Signal, digital signal processing by the central processing unit (MCU CPU), tare, calculate the net weight, and finally by the display digital display 30s, and then the CPU into sleep mode. Second, the hardware design 1 power supply with 3.3V button battery-powered, CPU requires 3.3V and 1.8V, through the DC-DC power chip LM1117-1.8V conversion from 3.3V 1.8V. According to the low-power design principles, the system power needs to be properly controlled and managed. System power in the power state, when idle, single-chip STM32F101T8 sleep mode, when the need to wake up when detected wake into working mode.