本报告介绍了基于AT89S52单片机为核心的、以AD0809数模转换芯片采样、以1602液晶屏显示的具有电压测量功能的具有一定精度的数字电压表。在实现基础功能要求之上扩展了串口通讯、时钟功能、高压报警、短路测试、电阻测量、交流电压峰峰值和周期测试等功能，使系统达到了良好的设计效果和要求。-This report describes the AT89S52 microcontroller based on the core to AD0809 DAC chip sampling to the LC

This application report describes how to simultaneously create a sine wave, a ramp, and a dc level with pulse-width modulated (PWM) signals from Timer_B on the MSP430 ultralow power family of microcontrollers. PWM signals are often used to create

The ever-increasing reliance on electronic devices which utilize AC power highlights the problems associated with the unexpected loss of power from the electrical grid. In places where the electrical infrastructure is not well-developed, brown-outs c