<div class="document"> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">* 1、项目介绍</h3> <p>基于R7FA2E1A72DFL芯片的桌面电子时钟设计，通过四位0.56寸共阴极数码管进行时间、温度等显示，采用DHT11温湿度传感器采集环境温湿度</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">*2、项目功能</h3> <hr class="horizontal-splitline normal-bold-2"> <p>1、主控芯片：R7FA2E1A72DFL；</p> <p>2、程序下载BOOT端口采用了短接的方法</p> <p>3、LED：一路电源指示灯，一路充电状态指示灯；</p> <p>4、按键：一个复位按键，三个功能按键；</p> <p>6、外设：一个0.56寸共阴极数码管，一个DHT11温湿度传感器，一个无源蜂鸣器；</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt">*3、硬件部分</h3> <hr class="horizontal-splitline normal-bold-2"> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em"><img src="//image.lceda.cn/pullimage/y1w3hG4zoq9azpZJMuwlzAAMvije9PKnOgfUv8y2.png" alt="y1w3hG4zoq9azpZJMuwlzAAMvije9PKnOgfUv8y2.png"></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em">4.1电源跟串口下载电路</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em"><img src="//image.lceda.cn/pullimage/h1wEb24bON56otkhU2i8HMUKmyX2vicx4gUSUH5N.png" alt="h1wEb24bON56otkhU2i8HMUKmyX2vicx4gUSUH5N.png"></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em">4.2、主控电路</p> <p>      主控单片机使用的是R7FA2E1A72DFL，工作电压在1.6V到5.5V之间，最大时钟频率为48Mhz，最大支持128-KB的FLASH，16-KB的SRAM，12位的AD转换控制器。芯片内部集成有晶振，可以无需外部晶振，同时集成触摸功能，无需触摸芯片即可实现触摸功能。</p> <p>      在电源输入部分加入电容进行电源滤波，VCL引脚用于稳定内部电源的平滑电容</p> <p><img src="https://image.lceda.cn/pullimage/rxjrpAag0j5TdTREmUv7CQGCwvpFBwk3sxEEjMzh.jpeg" alt="" width="500"></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em">4.3、复位电路和启动选择电路</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em">         复位也叫重启，按键RST按键，主控的RST引脚被拉低，系统进入复位状态，松开RST按键，主控的RST引脚恢复高电平，系统重新进行工作状态，完成复位。</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em">         当BOOT1短接没有短接时，BOOT引脚为高电平，单片机进入Single-chip模式，也就是正常工作模式，当按下按键时，BOOT引脚低电平，单片机进入SCI-BOOT模式，也就是程序下载模式，所以我们可以通过这个按键控制单片机进行程序下载或者正常运行。</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em"><img src="//image.lceda.cn/pullimage/tJQUeGSa4aqAONUiPqDNwQlnt3k63rGcapVMQ6i3.png" alt="tJQUeGSa4aqAONUiPqDNwQlnt3k63rGcapVMQ6i3.png"></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em">4.4、触摸控制电路</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em">    R7FA2E1A72DFL主控芯片是带有触摸功能的，在触摸线上加入560欧的阻尼电容以及适当的电容来稳定触摸信号，其实足够灵敏和准确。</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em"><img src="//image.lceda.cn/pullimage/4NbRdO4gdODvyf4feVCBVWIRQmINssNvhukfOdAc.png" alt="4NbRdO4gdODvyf4feVCBVWIRQmINssNvhukfOdAc.png"></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em">4.5、独立按键电路</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em"> 采用四个按键作为时钟控制或者其余功能使用。</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em"><img src="//image.lceda.cn/pullimage/TioFY7bgKia9f3CVZ8gGQ6zIqhoBOCImq1AQ8rWE.png" alt="TioFY7bgKia9f3CVZ8gGQ6zIqhoBOCImq1AQ8rWE.png"></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em">4.6、DHT11温湿度传感器电路</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em">     采用DHT11温湿度传感器检测环境温湿度，DHT11是单总线通信方式，需要在总线外接一个上拉电阻，当总线闲置时，其状态为高电平。</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em"><img src="//image.lceda.cn/pullimage/aGSr156t0LxF9linCCEWUYTeUpEaO2ewHk7n5pEB.png" alt="aGSr156t0LxF9linCCEWUYTeUpEaO2ewHk7n5pEB.png"></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em">4.7、无源蜂鸣器驱动电路</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em">       通过NPN三极管控制无源蜂鸣器的负极，这里的电磁无源蜂鸣器是感性负载，加入D3二极管作为续流二极管防止烧坏。</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em"><img src="//image.lceda.cn/pullimage/93uOWUjiGVoUIRFE08CULYm2dLNTaZGiNZCA4jBe.png" alt="93uOWUjiGVoUIRFE08CULYm2dLNTaZGiNZCA4jBe.png"></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em">4.8、四位数码管驱动电路</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em">      采用0.56寸共阴极数码管用于显示时间、温湿度等信息。</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em"><img src="//image.lceda.cn/pullimage/41MxnvgkXbnGI9xdKSKk4QdDAWunkO4yCaaUiEz7.png" alt="41MxnvgkXbnGI9xdKSKk4QdDAWunkO4yCaaUiEz7.png"></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em">4.9、锂电池充放电路</p> <p><img src="//image.lceda.cn/pullimage/SwOc2gJkOvfDahzL5U50miE6mTd9cT557xCJPeQe.png" alt="SwOc2gJkOvfDahzL5U50miE6mTd9cT557xCJPeQe.png"></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em">4.12、M3铜柱接口</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em">      通过四个M3的螺丝孔用于固定板子。</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em"><img src="https://image.lceda.cn/pullimage/CgOwNsHfpX6C9ICnrq1OLGSz0vf3qhHOa96Yz8Fq.jpeg" alt="" width="337"></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em" style="line-height:1.8;"> </p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">*6、BOM清单</h3> <hr class="horizontal-splitline normal-bold-2"> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><img src="//image.lceda.cn/pullimage/Ey1ghNLelFfuhAa7B9U1jStFxF8vEpz8NlouiOzh.png" alt="Ey1ghNLelFfuhAa7B9U1jStFxF8vEpz8NlouiOzh.png"></p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">* 8、演示项目视频</h3> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="font-size:14px;">更多详情：<a href="/posts/15a52db9fd7d40c492eb505280278e45" target="_blank">https://diy.szlcsc.com/posts/15a52db9fd7d40c492eb505280278e45</a></span></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> </div>