边缘计算网关自带2路继电器输出（DO），可以通过对DO节点写入1/0或者true/false来实现控制继电器的吸合或者断开。

继电器容量： 确保外接设备电压≤36V

1.准备工作

对于继电器的测试相当于比较简单，当前采用的是24V灯泡，相当于对负极，进行通断操作。

用了一个220V转24V的电源适配器。

下面为灯泡的链接

下面为电源的链接

2、进入Node-red实例中，进行节点配置

2-1、节点接线图

2-2、节点配置如下：

2-3、开启和关闭测试效果图

3、Node-red流程完整代码

[{"id":"e634dfae2ab59aa1","type":"inject","z":"614109be1d0295ac","name":"","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"true","payloadType":"bool","x":310,"y":200,"wires":[["6c02edb260041ad1"]]},{"id":"8df4707adfe7ceda","type":"inject","z":"614109be1d0295ac","name":"","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"false","payloadType":"bool","x":310,"y":280,"wires":[["6c02edb260041ad1"]]},{"id":"6c02edb260041ad1","type":"do","z":"614109be1d0295ac","name":"","index":"1","interval":false,"intervalValue":1000,"x":490,"y":240,"wires":[["ff751909c2eebd77"]]},{"id":"ff751909c2eebd77","type":"debug","z":"614109be1d0295ac","name":"debug 6","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":660,"y":240,"wires":[]},{"id":"e14547cf47d8b973","type":"global-config","env":[],"modules":{"node-red-AIoTedge-A300":"1.0.0"}}]