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Multiple RFM69HCW with the same Node ID? Answered

I wan wondering if it was possible to have multiple RFM69HCW (https://www.adafruit.com/product/3070) nodes with the same node ID on the same channel. My project I am doing involves a large amount of receivers and 1 transmitter in which I need all the nodes to receive the same message at the same time. Is this possible? I know the ACK wouldn't work as intended as from what I understand, but I am okay with that if this is so.

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bigjohn412

2 years ago

I figured out how to accomplish this. simply send the message to "node id" 255. This will broadcast a message to nodes 1-254.

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steveastrouk

2 years ago

No, each module must have a unique node ID, BUT the PACKET you send doesn't NEED an address, and your receiver code can ignore it.

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bigjohn412steveastrouk

Answer 2 years ago

So it is possible to send out a general mass message to multiple receivers from one transmitter you're saying? Because that's all I'm attempting to achieve lol

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steveastroukbigjohn412

Answer 2 years ago

Yes. At the higher level, your receiver code is responsible for determining if a given packet is destined for it. At a hardware level, node IDs are compulsory.

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bigjohn412steveastrouk

Answer 2 years ago

Okay awesome, Thanks a lot! I have one more question if you care to help! How would I go about sending a mass message out to the multiple receivers? Like I know in the RFM69 library, the send function requires a node ID number as far as I know. I've been working with these boards for about a month now so I am still kinda new to the library and the RFM69HCW boards. Thanks!

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steveastroukbigjohn412

Answer 2 years ago

Take a look at the detailed chip datasheet. You'll probably need to look at the Arduino driver code too.

I glanced over the chip datasheet to find what you needed. The rest is up to you....