HC-05 <-> HC-05

Using Arduino Networking, Protocols, and Devices
1

Hi,

I am trying to connect two Arduino Nano Every via two HC-05 - one set as Master and one set as Slave.

I am able to get bi-directional communication if I take out the HC-05 modules and hardwire the serial pins between the two Nanos, but if I take out the hard connection and add the HC-05 modules I am only able to get uni-directional communication.

My question - are the HC-05 modules capable of bi-direction communication when configured as Master / Slave?

2

Yes.
If you can get joy with them wired, your code is fine. I have no idea what the problem is, but it sounds like something silly and mechanical that will only happen once. If you get one-way, it means the wiring is kosher. I don't think it is possible to make some mistake in the config that the master one-way. I don't know how you are using them, but I don't think there is any procedural difference between wired and Bluetooth.

3

I found the problem ... on the slave HC-05 I had a broken resistor on my voltage divider.

Thanks Nick_Pyner for the push in the correct direction.