How do I add an existing device to an different, existing project?

Use bridge for that… OK, not for adding existing devices, but rather sharing info between different projects. Device A can send vPin data to Device B.

I do that when sending data between my solar monitors outside DHT22 sensor to my benchtop project, and compare it with the inside DHT22 sensor.

http://docs.blynk.cc/#widgets-other-bridge

I havent finished yet, but am working on a writeup for my C++ Blynk - Code Examples for Basic Tasks (Work in Progress) topic.

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