Bluetooth (2.0 SPP, 4.0 LE)
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This documentation is for the LEGACY version of Blynk platform which is no longer supported and will be shut down.
You can sign up for the current version of Blynk platform .
The new mobile apps can be downloaded from and .
The actual Blynk documentation is .
Bluetooth 4.0 (Smart, Low-Energy) modules are supported on both iOS and Android. Bluetooth 2.0 (Classic, Serial Port Profile) modules are supported only on Android.
When adding new hardware project, select Bluetooth or BLE connection method
Add "BLE" (for BTLE) or "Bluetooth" (for SPP) widget
In widget settings, click Connect button. It should say "connected"
Run your project
If "BLE" or "Bluetooth" widgets are not shown, it means your smartphone doesn't support it (be sure to enable Bluetooth and Location Services).
If it doesn't get connected:
Restart your phone and retry
Try using original examples of your hardware/library providers - maybe the problem is in hardware/wiring