The standard when making a project with electronics using arduino is to close the circuit by connecting all the GND’s together. When using a bridge widget you essentially have different circuits so am i correct in assuming you DO NOT need to tie the GND’s together between the different devices?
No. when using the bridge widget, the devices could be many miles apart. You just need the device Auth Token, and that they are both connected to the internet/BLYNK (or a properly set-up BLYNK local server).
Brilliant!! a lot less wiring to think about