No data Shown on Blynk app (sensor reading Arduino Nano and SW420)

[PeteKnight]

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[Solved] Arduino Uno USB Serial - Device Offline in Blynk 2.0

Your script is trying to connect to blynk-cloud.com, which is the Legacy server. You could try editIng the script and changing the server to blynk.cloud and maybe port 8080 but not sure if USB connection is supported in Blynk IoT. Normally the Template ID is required and I don’t think the script has been updated to accommodate this. Pete.

Pete.