带功能节点和继电器的节点-红色温度传感器
Node-red temperature sensor with function node and relay
我想用一个DS18b20探头连接树莓派来控制空调。
我让继电器在我想要的正确温度下打开和关闭。
下一步是我挣扎的地方......
我的要求：
关闭空调 <= 20（这有效）
打开空调 >= 25（这有效）
当空调在 25 以上打开时...保持空调打开直到达到 20，然后关闭（这我无法工作）
冷气关闭后，等待10分钟{以保护电机}（我无法工作）
我试过使用具有以下代码的函数节点：
非常感谢这里的任何帮助...我已经尝试对开关和更改节点做同样的事情，但我不能让延迟部分工作或者让它保持冷却直到 20。
因此，为了使它正常工作，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 2 个上下文变量：
- aircon_is_on : 是一个布尔值，表示空调当前是打开还是关闭。
- aircon_last_switch_tms : 是最后一次打开或关闭空调的时间戳（自 1970 年以来以毫秒数表示）。
您可以在下方找到流程的详细信息。
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flow context variables","info":"","x":227,"y":462,"wires":[]},{"id":"4a49b01b.1db3","type":"inject","z":"cc99810d.fdcb8","name":"","topic":"","payload":"aircon_is_on","payloadType":"flow","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":169,"y":499,"wires":[["2497d1be.1155ce"]]},{"id":"2497d1be.1155ce","type":"debug","z":"cc99810d.fdcb8","name":"flow.aircon_is_on","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","x":610,"y":500,"wires":[]},{"id":"14796044.a8c56","type":"comment","z":"cc99810d.fdcb8","name":"output to switch on /off aircon","info":"","x":1360,"y":100,"wires":[]},{"id":"3411ff23.37aa1","type":"comment","z":"cc99810d.fdcb8","name":"aircon flow context variables","info":"This flow makes use of 2 flow context variables:\n1. *aircon_is_on* : is a boolean indicating if the aircon is currently switched on or off.\n2. *aircon_last_switch_tms* : is a timestamp (expressed in number of milli seconds since 1970) of the last time the aircon has been switch on or off.","x":453,"y":26,"wires":[]}]
韩语
一月
我想用一个DS18b20探头连接树莓派来控制空调。 我让继电器在我想要的正确温度下打开和关闭。 下一步是我挣扎的地方...... 我的要求： 关闭空调 <= 20（这有效） 打开空调 >= 25（这有效） 当空调在 25 以上打开时...保持空调打开直到达到 20，然后关闭（这我无法工作） 冷气关闭后，等待10分钟{以保护电机}（我无法工作）
我试过使用具有以下代码的函数节点：
非常感谢这里的任何帮助...我已经尝试对开关和更改节点做同样的事情，但我不能让延迟部分工作或者让它保持冷却直到 20。
因此，为了使它正常工作，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 2 个上下文变量：
- aircon_is_on : 是一个布尔值，表示空调当前是打开还是关闭。
- aircon_last_switch_tms : 是最后一次打开或关闭空调的时间戳（自 1970 年以来以毫秒数表示）。
您可以在下方找到流程的详细信息。
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aircon has been switch on or off.","x":453,"y":26,"wires":[]}]
韩语 一月