Write to virtual input pin

Need Help With My Project
1

Hello fellow hackers. I’m working on (the design of) my first Blynk project, but before I start I want to know whether my wanted setup will work or not. I cannot find an answer to this question anywhere else on this forum.

The scenario is something like this: I have a switch button in the Android app connected to V1. I understand that BLYNK_WRITE(V1) will be called on my microcontroller if the button is clicked. The thing is that I want to be able to call Blynk.virtualWrite(V1, 1); on my microcontroller as well. When I do this, the button in the app should switch.

I suppose this will at least work passively (the value will change on the server, so when I close the app and reopen it, it would be changed, right?). I want at least this to be working, but in de ideal scenario the button will also switch actively without having to restart the app (with an allowed delay of a few seconds). Will this be the case?

Thank you for your help!

2

Hello. This scenario will work. The only thing is - button will automatically change state after pressed on app, even hardware didn’t receive it. You can use LED to be 100% command was delivered. Blynk.virtualWrite(V2, 255). Where V2 is LED on app

3

Thanks for your reply. I indeed thought about using a led in the app, but that would be kind of double since the button state should indicate the pin value.

I stille do nog have a clear answer though. When I change the pin value via the microcontroller, will the button state in the app change as wel when I have the app open? Or only if I restart the app? (I suppose the app syncs when I open it)

4

Yes. (If project is active). Any command is stored on server so you are able to get latest state both on hardware and on app.

5

This will work only for virtual pins