Hello, im new to Node-RED. I'm using a vibration sensor and I manage to send an email when the alarm triggered. The problem I'm having right now is, I want Node-RED only send the alarm once not multiple times when the alarm triggered. Is there a way to do this?
Sure, create a flow variable that will act as a switch. before you send the message, check if a msg has been sent (switch
node) and after the email node, set the variable to indicate the message has been sent (change
node).
Of course now you have to think about how you will reset the switch...after 5 hours, 10 minutes? I'd add a delay
and another change
node - after the first change
node - to reset the switch
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