具有功能节点和继电器的节点红色温度传感器

Question

我想使用连接到Raspberri Pi的DS18b20探头来控制空调。 我让继电器在我想要的正确温度下开启和关闭。 下一步是我在努力的地方...... 我的要求： 关闭空调＆lt; = 20（这是有效的） 打开空调＆gt; = 25（这可行） 当空调开启25以上......保持空调开启直到20，然后关闭（这我不能工作） 当空调关闭时，等待10分钟{以保护电机}（这我无法工作）

我尝试过使用带有以下代码的函数节点：

任何帮助都非常感谢...我已经尝试过切换和更换节点，但我可以;让延迟部分工作，或者让它继续冷却到20。

Answer 1

因此，为了使其工作，您需要流上下文变量来存储状态。我为您的问题创建了以下示例流程，它使用了以下两个上下文变量：

• aircon_is_on ：是一个布尔值，表示空调当前是否已开启或关闭。
• aircon_last_switch_tms ：是空调最后一次打开或关闭的时间戳（以1970年以来的毫秒数表示）。

您可以在下面找到该流程的详细信息。

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output","info":"","x":210,"y":140,"wires":[]},{"id":"d0544032.848e","type":"inject","z":"cc99810d.fdcb8","name":"","topic":"","payload":"20","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":130,"y":240,"wires":[["cd981b11.6bac88"]]},{"id":"995c2849.57d9f8","type":"inject","z":"cc99810d.fdcb8","name":"","topic":"","payload":"21","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":130,"y":280,"wires":[["cd981b11.6bac88"]]},{"id":"f6cee931.a62e78","type":"inject","z":"cc99810d.fdcb8","name":"","topic":"","payload":"24","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":130,"y":320,"wires":[["cd981b11.6bac88"]]},{"id":"3dcf7adb.db0d66","type":"inject","z":"cc99810d.fdcb8","name":"","topic":"","payload":"25","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":130,"y":360,"wires":[["cd981b11.6bac88"]]},{"id":"76d055f9.3878dc","type":"inject","z":"cc99810d.fdcb8","name":"","topic":"","payload":"26","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":130,"y":400,"wires":[["cd981b11.6bac88"]]},{"id":"7698406b.1ca73","type":"change","z":"cc99810d.fdcb8","name":"set flow context and payload to switch off aircon","rules":[{"t":"set","p":"aircon_is_on","pt":"flow","to":"false","tot":"bool"},{"t":"set","p":"aircon_last_switch_tms","pt":"flow","to":"","tot":"date"},{"t":"set","p":"payload","pt":"msg","to":"false","tot":"bool"}],"action":"","property":"","from":"","to":"","reg":false,"x":1060,"y":220,"wires":[["7d3fbf47.1bc7a"]]},{"id":"cd981b11.6bac88","type":"switch","z":"cc99810d.fdcb8","name":"aircon is on ?","property":"aircon_is_on","propertyType":"flow","rules":[{"t":"true"},{"t":"false"}],"checkall":"true","repair":false,"outputs":2,"x":330,"y":300,"wires":[["ea9a6fa9.67ae5"],["fc9c4632.967d78"]]},{"id":"ea9a6fa9.67ae5","type":"switch","z":"cc99810d.fdcb8","name":"temp <= 20 ?","property":"payload","propertyType":"msg","rules":[{"t":"lte","v":"20","vt":"num"}],"checkall":"true","repair":false,"outputs":1,"x":510,"y":220,"wires":[["7698406b.1ca73"]]},{"id":"7d3fbf47.1bc7a","type":"debug","z":"cc99810d.fdcb8","name":"aircon command to switch it 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1970)","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","x":730,"y":540,"wires":[]},{"id":"e6dec5ed.6e6d78","type":"inject","z":"cc99810d.fdcb8","name":"flow.aircon_last_switch_tms","topic":"","payload":"aircon_last_switch_tms","payloadType":"flow","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":180,"y":540,"wires":[["a8acfa78.442cd8","b8c55cf8.7f1fe"]]},{"id":"2a2df95.069e206","type":"debug","z":"cc99810d.fdcb8","name":"flow.aircon_last_switch_tms","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","x":640,"y":600,"wires":[]},{"id":"b8c55cf8.7f1fe","type":"change","z":"cc99810d.fdcb8","name":"$fromMillis(payload)","rules":[{"t":"set","p":"payload","pt":"msg","to":"$fromMillis(payload)","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":360,"y":600,"wires":[["2a2df95.069e206"]]},{"id":"ff677399.2c529","type":"comment","z":"cc99810d.fdcb8","name":"test nodes to check the aircon 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aircon has been switch on or off.","x":453,"y":26,"wires":[]}]

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