改造4-20mA两线制无源数显表第八帖（光耦实验）
<p style="text-indent:21.0pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif"><span style="font-size:14.0pt"><span style="font-family:宋体">搞开发从来就没有一帆风顺的，最近卡在原仪表设置通信软硬件协议捣鼓上。好在打样板子做回来（吐槽一句，便宜得来的</span></span><span lang="EN-US" style="font-size:14.0pt">5</span><span style="font-size:14.0pt"><span style="font-family:宋体">元打样板确实有坑：焊点明显不易上锡！烙铁烫半天才能吃锡焊牢），可以先测试看看在低电流供电下</span></span><span lang="EN-US" style="font-size:14.0pt">RSL10</span><span style="font-size:14.0pt"><span style="font-family:宋体">电路能否通过光耦把数据电平传出来，让对方电路可靠接收到。实验是这样设置的：用</span></span><span lang="EN-US" style="font-size:14.0pt">2</span><span style="font-size:14.0pt"><span style="font-family:宋体">块开发板，之前测试电流的</span></span><span lang="EN-US" style="font-size:14.0pt">RSL10-SENSE-DB-GEVK</span><span style="font-size:14.0pt"><span style="font-family:宋体">这板还是用作蓝牙接收命令，这回把点亮板载</span></span><span lang="EN-US" style="font-size:14.0pt">LED</span><span style="font-size:14.0pt"><span style="font-family:宋体">灯的程序改成从板上“</span></span><span lang="EN-US" style="font-size:14.0pt">SDA</span><span style="font-size:14.0pt"><span style="font-family:宋体">”右边那个闲置的</span></span><span lang="EN-US" style="font-size:14.0pt">IO</span><span style="font-size:14.0pt"><span style="font-family:宋体">口“</span></span><span lang="EN-US" style="font-size:14.0pt">GIO</span><span style="font-size:14.0pt"><span style="font-family:宋体">”做数据电平输出用；另外用大板</span></span><span lang="EN-US" style="font-size:14.0pt">RSL10-002GEVB</span><span style="font-size:14.0pt"><span style="font-family:宋体">由</span></span><span lang="EN-US" style="font-size:14.0pt">2</span><span style="font-size:14.0pt"><span style="font-family:宋体">节</span></span><span lang="EN-US" style="font-size:14.0pt">5</span><span style="font-size:14.0pt"><span style="font-family:宋体">号电池独立供电做接收演示，这块大板烧入那个“</span></span><span lang="EN-US" style="font-size:14.0pt">blinky</span><span style="font-size:14.0pt"><span style="font-family:宋体">”例程，稍作改动如下：</span></span></span></span></p><p> </p>
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<p style="text-indent:21.0pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif"><span style="font-size:14.0pt"><span style="font-family:宋体">注释掉上句，由下面新加的那句靠</span></span><span lang="EN-US" style="font-size:14.0pt">DIO12</span><span style="font-size:14.0pt"><span style="font-family:宋体">电平控制</span></span><span lang="EN-US" style="font-size:14.0pt">LED</span><span style="font-size:14.0pt"><span style="font-family:宋体">闪烁启停，因为</span></span><span lang="EN-US" style="font-size:14.0pt">DIO12</span><span style="font-size:14.0pt"><span style="font-family:宋体">在板上布局靠近</span></span><span lang="EN-US" style="font-size:14.0pt">GND:</span></span></span></p>
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<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif"><span style="font-size:14.0pt"><span style="font-family:宋体">这样从光耦隔离输出就按下图所示控制</span></span><span lang="EN-US" style="font-size:14.0pt">DIO12</span><span style="font-size:14.0pt"><span style="font-family:宋体">高低电平：</span></span></span></span></p>
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<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif"><span style="font-size:14.0pt"><span style="font-family:宋体">如此，手机发出命令使小板</span></span><span lang="EN-US" style="font-size:14.0pt">RSL10-SENSE-DB-GEVK</span><span style="font-size:14.0pt"><span style="font-family:宋体">的“</span></span><span lang="EN-US" style="font-size:14.0pt">GIO</span><span style="font-size:14.0pt"><span style="font-family:宋体">”电平高低变化，通过光耦隔离输出到使大板</span></span><span lang="EN-US" style="font-size:14.0pt">DIO12</span><span style="font-size:14.0pt"><span style="font-family:宋体">高低变化，高时可见</span></span><span lang="EN-US" style="font-size:14.0pt">LED</span><span style="font-size:14.0pt"><span style="font-family:宋体">闪烁，低时就停闪。具体请见视频（地址：</span></span><a href="https://www.bilibili.com/video/BV18B4y1K7VQ/" style="color:blue; text-decoration:underline">RSL10<span lang="EN-US" style="font-family:宋体">通过光耦传递电平实验</span>-2021-6-27_<span lang="EN-US" style="font-family:宋体">哔哩哔哩</span>_bilibili</a><span style="font-size:14.0pt"><span style="font-family:宋体">）。简要说明：视频中左边绿色仪表是可控恒流输出电流表，当前输出</span></span><span lang="EN-US" style="font-size:14.0pt">3mA</span><span style="font-size:14.0pt"><span style="font-family:宋体">，再通过（右侧）串接的电流表监测实际电流后供给自制的光耦隔离电路板及插接的</span></span><span lang="EN-US" style="font-size:14.0pt">RSL10</span><span style="font-size:14.0pt"><span style="font-family:宋体">小板做电源，实测在</span></span><span lang="EN-US" style="font-size:14.0pt">3mA</span><span style="font-size:14.0pt"><span style="font-family:宋体">总电流时自制隔离板压降</span></span><span lang="EN-US" style="font-size:14.0pt">2.32V</span><span style="font-size:14.0pt"><span style="font-family:宋体">，</span></span><span lang="EN-US" style="font-size:14.0pt">4mA</span><span style="font-size:14.0pt"><span style="font-family:宋体">时压降</span></span><span lang="EN-US" style="font-size:14.0pt">2.45V</span><span style="font-size:14.0pt"><span style="font-family:宋体">，可见实现了蓝牙遥控数据电平的可靠传送。接下来还是折腾数据传送</span></span></span></span><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif"><span style="font-size:14.0pt"><span style="font-family:宋体">协议，本项目最硬的骨头了，感到时间紧迫。</span></span><span lang="EN-US" style="font-size:14.0pt">2021-6-27</span></span></span><iframe allowfullscreen="true" frameborder="0" height="450" src="//player.bilibili.com/player.html?bvid=18B4y1K7VQ&page=1" style="background:#eee;margin-bottom:10px;" width="750"></iframe></p>
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<p>期待数据传送协议，加油加油。</p>
soso 发表于 2021-6-28 09:13
期待数据传送协议，加油加油。
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