I want to use my Arduino with this: VAC8010F measure unit. It communicates with NRF24L01. The problem is I simply don't know which band or information it is receiving. Can somebody help me with this?
Thanks for any suggestions!
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What does your favorite search engine reveal? What did the data sheets and documentation tell you? What is it what you do not understand in their contents? -- Please take the tour and read "How to Ask". Then show some effort and come back to edit your question.– the busybeeCommented Mar 3, 2020 at 19:59
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1You need to know the channel and the pipe-id (and speed, though my guess would be 1Mbps). To find the channel github.com/nRF24/RF24/blob/master/examples/scanner/scanner.ino might help. Not sure how to find the pipe-id.– GerbenCommented Mar 3, 2020 at 20:11
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One possibility is sniffing the SPI bus and seeing how the module is configured. Another is using an SDR and decoding the communication on-air. Third method is dumping the unit's firmware and reverse-engineering it. Any other methods are probably too slow, I'm not aware of a promiscuous mode on the nRF24L01+ and checking all speeds, channels and pipes is way too slow.– AvamanderCommented Mar 3, 2020 at 23:22
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Sniffing the SPI bus is probably the easiest, you could possibly even attach your own wires to the bus and possibly read out all the registers.– AvamanderCommented Mar 3, 2020 at 23:23
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2 Answers
Don't have full details yet. But the VAC8010F uses modbus RS485 protocol. My research shows that the NRF24 just transmitts and receives the MODBUS protocol to and from master/slave. I have found modbus libs and samples of code on the net. There is a command driven program to communicate with MODBUS free for linux, which is the o/s I use. I don't know about win. Anyway, once I receive the MAX485TTL interface for my ARDUINO MEGA I will write code for data logging to p.c. then modify to use the NRF24, as I should be able to extract the ADDRESS, and CHANNELS etc, and packet construct.
Hope this is of some help.
Patrick
Nordic has an app to connect to nRF https://www.instructables.com/Send-Data-to-Mobile-Using-NRF24L01-Using-NRF-As-a-/
The app is available for all platforms. Did not try it myself. Hope this helps. I going to do the same, but want receive it on Android.
If you got some news, please let me know. Thanks
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Have got a cheap Logic Analyzer to use with Saleae Software. Many protocols can be choosen including modbus. @Patrick: Do you know the baudrate? is it RTU/ASCII? Who is Master/Slave?– RudiCommented Apr 4, 2021 at 18:10