I would like to connect 2 Arduinos across my flat - weather sensor from balcony to weather station in living room.
I'm wondering if BLE Modules are right for this. Low energy sounds good. at least for the sensor
On the other hands site, all examples I have found so far, connect one Arduino to a Smartphone, not to each other, and it is always a close distance.
Is there an option to use BLE Modules to have a communication between 2 Arduinos?
Do the genereic available BLE modules (Seems to be always "Slave") work?
Do I need special ones - e.g. Master/Slave combination?
Your BLE modules should connect the same way as BT2 modules. I suspect BLE will become the norm before too long.
The AT codes are the same for both the HC-05 and the HM-10 and the latter should be a drop-in replacemnt for the former. In the light of this, the article by Philipe Cantin on Arduino<>ARduino connection should apply with BLE.
You need modules that are in master mode. While master modules are in slave mode by default, they can all be set up as master. I am not aware of any BLE module that is slave-only.
Note that, if power is a concern, both modules need to be BLE.
Starting with this, I finally found the chipset und implementation information to my BLE Modules ... These are slave ones, thats it
However, I was anyways on the track to test several options - NRF24, BLE and Bluetooth "Standard" with HC05.
So the links to the HC05 are very welcome and saved me a lot of time to understand how data and AT mode are administered. I own unfortunately the most difficult HC05 implementation what does not act on high / low pins but only when these models get powered on.