javascript - Node-red temperature sensor with function node and relay

Question

I want to use a DS18b20 probe connected to Raspberri Pi to control by aircon. I get the relay to switch on and off at the correct temperatures I want. The next step is where I am struggling... My requirements: Switch aircon off <= 20 (this works) Switch aircon on >= 25 (this works) when the aircon switches on above 25...keep the aircon on until 20 is reached, then switch off (this I can't get working) when the aircon switches off, wait for 10min {to protect the motor} (This I can't get working)

I have tried using a function node with the following code:

Any help here it be greatly appreciated...I have tried doing the same with switch and change nodes, but I can;t get the delay portion working then or get it to stay on to cool down till 20.

标签： javascriptnode-redhome-automation

Answer 1

因此，为了使其正常工作，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，该流程使用了以下 2 个上下文变量：

• aircon_is_on：是一个布尔值，指示空调当前是打开还是关闭。
• aircon_last_switch_tms：是上次打开或关闭空调的时间戳（以自 1970 年以来的毫秒数表示）。

您可以在下面找到流程的详细信息。

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