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Topic: Adafruit Feather 32u4 LoRA (Read 177 times) previous topic - next topic

olivier406

Hello

after 2 hours of research I decided me to write here,

I have 2 Feather 32u4 LoRA900 ( 1Tx and 1 Rx) => work good


I want to add an other Tx ( for have 2Tx transmiting one 1Rx)

how to make for the 2 Tx do not disturb itself ( using only one way transmiting) ?

thank

srnet

Connect an IO pin between the two Feather 32u4 LoRA900 TXs.

When one transmits set the IO pin high and the other TX reads this IO pin and will not transmit till the other TX has finished. 
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olivier406

Thank srnet

Your solution is good, but is not possible in my application, the 2 TX devises are very far from each other.

in general, how to do if my neighbor uses a transmitter Lora has the same frequency as me?

srnet

Thank srnet

Your solution is good, but is not possible in my application, the 2 TX devises are very far from each other.

in general, how to do if my neighbor uses a transmitter Lora has the same frequency as me?
Well, my answer was based on your description of the problem, which was lacking in a lot of detail.

So, describe what your project is and what you are trying to do. Describe it in a way that makes sense to us, terms like 'very far' and 'neighbor' presumably mean somthing to you, but the rest of us can only guess.
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DrAzzy

If the transmitters are also capable of receiving, not just transmitting (not familiar with that product, can't comment on this), they could wait for a time when they aren't currently seeing traffic, which would probably be good enough.
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srnet

Detection of channel activity in LoRa is possible via the CAD (channel activity detect) detect process.

However its not foolproof, there are false positives and will not work with the weakest packets.

In approximate terms CAD will only detect transmissions that are at around half the maximum range possible with a particular set of LoRa parameters.
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MITEL

Being on a free frequency, there will be also some other transmitter that can send when you are sending (e.g., remote controls for automatic gates), not only LoRa transmitters, so the issue is wider. However, LoRa has good capabilities in signal discrimination. You may send packets with confirmation.

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