LED Widgets Broken by App Upgrade (iOS)

[davidmiles]

I upgraded the Blynk app on my iPhone to the latest (8 Jan) release yesterday evening. As soon as I did that all the LED widgets on my projects stopped working.

They meant to light up when the virtual pin value is set to 1 and go off when it is set to 0. And that has worked fine prior to me doing the upgrade. I use the Blynk nodes in Node Red to do this.

After a while this morning I stumbled on this thread

Ok - a simple question on how to light a virtual LED

Hi All, I worked out how the Blynk LED works by trial an error. Initially I thought an output of LOW\HIGH or 0\1 would make the LED light up but I was mistaken. It appears the the LED in the Blynk app has brightness control. It’s not just an on/off LED! The value range is 0 to 1023. If you configure an LED to be connected to Virtual Pin 2 the Arduino code is: Blynk.virtualWrite(2, 0); //turn off Blynk.virtualWrite(2, 1023); //turn on - 100% brightness Blynk.virtualWrite(2, 511); …

Sure enough, once I changed my Node Red flows to send 1023 for “on” instead of “1” the LEDs started working again.

So it looks like the iOS app previously did NOT support dimming of the LED widgets and now it does. That’s ok I suppose, but it would be nice if there was advance warning if something like that changes which will break existing widgets.

[Dmitriy]

@davidmiles

So it looks like the iOS app previously did NOT support dimming of the LED widgets and now it does.

Exactly. Docs. updated accordingly.

@davidmiles

it would be nice if there was advance warning if something like that changes which will break existing widgets.

Agree. We missed that. Too many changes were done in latest release. Sorry for inconveniences.

[davidmiles]

I’ve seen other posts that say the max value is 255 rather than 1023. Can you confirm which value I should be using please?

[Pavel]

You should use 0-255