aoyun

本系统以直流电流源为核心，AT89S52单片机为主控制器，通过键盘来设置直流电源的输出电流，设置步进等级可达1mA，并可由数码管显示实际输出电流值和电流设定值。本系统由单片机程控输出数字信号，经过D/A转换器（AD7543）输出模拟量，再经过运算放大器隔离放大，控制输出功率管的基极，随着功率管基极电压的变化而输出不同的电流。单片机系统还兼顾对恒流源进行实时监控，输出电流经过电流/电压转变后，通过A/D转换芯片，实时把模拟量转化为数据量，再经单片机分析处理， 通过数据形式的反馈环节，使电流更加稳定，这样构成稳定的压控电流源。实际测试结果表明，本系统输出电流稳定，不随负载和环境温度变化，并具有很高的精度，输出电流误差范围±5mA，输出电流可在20mA~2000mA范围内任意设定，因而可实际应用于需要高稳定度小功率恒流源的领域。(the system to DC current source to the core, MCU AT89S52 main controller, through the keyboard to set up DC power supply output current, set up to 1mA Stepping grades, digital control can be shown by the actual output current value and current setting. The system consists of programmable microcontroller digital signal output, after the D/A converters (AD7543) analog output. After Operational Amplifiers isolation, amplification and control of the output power base. With the power of the base voltage changes in the output current. SCM system also takes on the constant current source for real-time monitoring, after current output current/voltage changes, the A/D converter chip, real-time conversion from analog to the volume of data and then analyzed by the MCU, through data link in the )

51单片机控制16乘以16点阵，可以显示汉字等(51 single chip control 16 times the 16 dot matrix, you can display Chinese characters, etc.)

说明：  朋友开放源码接口文档，朋友社区开放平台文档，腾讯朋友(Friends of open source interface documentation, friends community open platform document, Tencent friends)

LLC 电源源码(含原理图)

说明：  超声波模块hc-sr04基于f4的超声波测距实验(Ultrasonic ranging experiment of hc-sr04 ultrasonic module based on F4)

创文企业网站管理系统小巧，功能齐全，集新闻、产品展示、在线留言、网站内链、友情链接、自宝义标签、模板管理、站内搜索等特色功能，是中小企业网站建设的首先系统(Chong Wen enterprise website management system compact, full-featured, set news, products, online message, website link, Links, since Bao Yi labels, template management, station search and other features, is the first website building system for SMEs)

本文介绍一种利用单片机本身所提供的串行通讯口，采用自定义串行通信协议，加上总线驱动器如MAX481、MAX483、MAX485、MAX487等组合成简单的RS－485通讯网络，完成单片机间的多机通讯。(This article describes a serial communication port provided by the microcontroller itself, the custom serial communication protocols, coupled with the bus driver, such as the MAX481, MAX483, MAX485, MAX487, combined into a simple RS-485 communication network, complete single-chip between themulti-machine communication. )

DALI调光详细讲解，软硬件齐全，不可多得的好材料(DALI dimming elaborate hardware and software is complete, the rare good material)

STM32F103 LTC4150电源管理 把电量和电量百分比放到stm32的内部flash中。(STM32F103 LTC4150 power management to power and the percentage of power into stm32 internal flash.)

采用ATMEGA48单片机，采用状态机实现按键的单击、双击、长按的按键功能(The ATMEGA48 microcontroller, using the state machine to implement the double click click button long press keys function )