HC-05 losing connection after ~20 minutes

Projects Networking, Protocols, and Devices
1

Hello all,

I am working on a project where I have an Arduino with a master HC-05 and an Arduino with a slave HC-05. I use the master HC-05 to pass data to the slave.

On initial setup, everything works fine. The slave HC-05 receives the serial data that I send from the master. But then if the signal is blocked or after about 20 minutes, eventually the slave stops receiving data. I hooked up a cheap DSO Shell O-scope to the slave and when it stops receiving data the RX and TX voltages flatline at 3.3V.

The thing that confuses me is that both HC-05 modules do the 2 second delay double LED blink like they think they are still connected.

Any idea why the Bluetooth modules think they are still connected, yet my slave module stops passing the data it receives through RX pin?

2

Forum members are very likely have some ideas, if you would take the time to more carefully describe the project, as detailed in the "How to use this forum" post.

Preliminaries would include posting the code properly, using code tags.