Two Arduino sending Data

[Jens Noriʇzsɔɥ]

What are you using on the Arduino side: phyphoxBLE? I would likely use our library for both microcontrollers and merge the two generated experiments into one by a text editor.

On first sight, both BLE characteristics write into the same buffer, accordingly you have two identical graphs. I assume that is not intended…

Answers to some of your questions:

• the UUID is (mainly) a generic identifier for heart rate monitors, HID services etc.,
  
• “notification” mode lets the microcontroller set the rate, we mainly use this ourselves,
  
• phyphox does not record data before tapping start, so likely no subscribeOnStart required
  
• conversion indicates to phyphox how the data is transmitted, float or integer requires the lowest amount of data (again: phyphoxBLE would take care of that and you could look into the generated experiment)
  

There is some documentation on Bluetooth Low Energy in phyphox at https://phyphox.org/wiki/index.php/Bluetooth_Low_Energy