Controling switch-buton by using arduino?

[Fitim]

Hi

im using a switch-button on blynk dashboard to control a relay for 30min

how can i realize that the switch-button falls back after 30min? (when the relay is low again)

[PeteKnight]

By using the button’s On status to trigger a timeout timer that runs for 30 minutes, then writes an Off value to the widget’s virtual pin.

You might want to read these…

Using Virtual Pins to control physical devices

I thought I’d write a guide about how to use virtual pins with app widgets such as buttons, to control physical devices such as relays, LEDs etc… Why use virtual pins anyway? I’d always recommend using virtual pins over physical pins when developing your code. There are a number of reasons, but here are what I consider to be the main ones: Virtual pins are hardware independent. This means that it’s far easier to port your code from one hardware platform to another in future (when you realise…

Using BlynkTimer or SimpleTimer

Many users seem to struggle with the basic concepts of using BlynkTimer in their projects, despite the excellent discussions and tutorials that exist on this forum, so I thought I’d write a guide that will hopefully help clarify things. It’s rather long, as it attempts to explain the reasoning behind why and how we use timers, and covers some more advanced subjects, but I’ve tried to organise it in a way that helps people to find answers to specific questions… Why use a timer at all? Let’s say …

Pete.

[John93]

You can also try the automation which is the easiest way, you can use the automation to make something like this