Hello Guys
When my nodemcu card starts up (ie when the card is powered) the relay is triggered and it is a big security problem for me. Does anyone have any idea how I can fix it?
Some details, such as the sketch that you are running, the type of relay (active HIGH or active LOW) and whether you are using digital or virtual pins in the app would be useful.
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The solution for this is generally to use virtual pins along with the corresponding BLYNK_WRITE(vPin) callback function(s) and to put pinMode and digitalWrite commands in to your void loop to initialise the GPIO pin to the desired state at startup.
You may also need top choose a more appropriate GPIO pin…
Pete.