简介
node-red-contrib-i2c-pecmac125a 是一个用于与 PECMAC125A I2C 数字电平转换器通信的 Node-RED 节点。PECMAC125A I2C 数字电平转换器是一种广泛应用于嵌入式系统和物联网设备中的芯片，它可以将高电平转换成低电平或将低电平转换成高电平，从而实现两个不同电平标准之间的通信。
安装
首先，需要先安装 Node-RED。如果你已经安装了 Node-RED，在命令行中输入以下命令即可安装 node-red-contrib-i2c-pecmac125a：
npm install node-red-contrib-i2c-pecmac125a
使用
- 新建一个 Node-RED 流程，在左侧栏的搜索框中输入 “PECMAC125A”，你会看到一个名为 “pecmac125a I2C” 的节点。
- 将 “pecmac125a I2C” 节点拖到流程画布上，并连接其他节点。
- 双击节点以配置设备地址和功能码。
示例代码
[{"id":"18624cc4.baa88d","type":"pecmac125a-i2c","z":"f2bb4f4c.d652","name":"","address":"29","functioncode":"8","payload":"","payloadType":"str","x":420,"y":200,"wires":[["53c673cc.897fc4","d6588b1.01f20e8"]]},{"id":"53c673cc.897fc4","type":"debug","z":"f2bb4f4c.d652","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":740,"y":140,"wires":[]},{"id":"d6588b1.01f20e8","type":"ui_gauge","z":"f2bb4f4c.d652","name":"PECMAC125A Reading","group":"5c4856c2.6ff1b8","order":0,"width":0,"height":0,"gtype":"gage","title":"PECMAC125A Reading","label":"units","format":"{{value}}","min":0,"max":"100","colors":["#00b500","#e6e600","#ca3838"],"seg1":"","seg2":"","x":730,"y":260,"wires":[]},{"id":"5c4856c2.6ff1b8","type":"ui_group","z":"","name":"PECMAC125A","tab":"5ed5c5a5.e7b348","order":1,"disp":true,"width":"6","collapse":false},{"id":"5ed5c5a5.e7b348","type":"ui_tab","z":"","name":"PECMAC125A I2C","icon":"dashboard","order":4,"disabled":false,"hidden":false}]意义和学习指导
node-red-contrib-i2c-pecmac125a 是 Node-RED 社区中提供的一个实用的 i2c 库，它可以在物联网和嵌入式开发中帮助开发人员快速实现 I2C 总线设备的通信功能。学习和使用 node-red-contrib-i2c-pecmac125a 不仅可以加深对 I2C 总线协议的理解，更有助于提高工作效率和代码重用率，从而在开发和设计中取得更好的成果。
来源：JavaScript中文网 ，转载请注明来源 https://www.javascriptcn.com/post/60055ccd81e8991b448da6b4