[Ivan]

Hi Renzo.

Thanks. Understood.

But, powering E220 with 5V or 3.3V, M0 and M1 can be manipulated with 5V without problem, right?

Ivan

[Ivan]

Hi Renzo.

I’m sorry, you’re right, but I saw only this line with this specification:

“Communication interface UART Serial Port TTL Level”

Well, all my tech life, I suposed “TTL Level” was 5 Volts, not 3.3 Volts.

I should have paid more attention to all the information in the datasheet.

With this information I have another doubt:

If RX work with only 3.3V, I supose the TX pin from E220 have 3.3V level in it. You see problem to arduino receive data in RX pin with this level or could be better to use a voltage level module complete for TX/RX?

Thanks,

Ivan

[Ivan]

Hi Renzo,

I believe with your information we can produce an introductory code and test it here.

If the code works, I’ll share it here for everyone’s knowledge.

If it doesn’t work and we can’t figure out why, I’ll call you again 🙂

Thank you very much for your attention!

Ho visto che sei di Perugia.
È una bellissima regione per la sua natura e la sua storia.
Congratulazioni!

Ivan

[Ivan]

Hi Renzo.

Our application with more details:

1. Neither the master nor the slaves sleep as they will be powered all the time by the eletricity network

2. Each time a slave has something to send to the master, the set of information does not exceed 8 bytes, but it can be divided into more than one transmission, if necessary, without problem.

3. As soon as the master receives data from a slave, it stops pooling and will process the slave’s operation, only resuming pooling after this processing, which can take up to 1 minute or more.

4. For security reasons, it is mandatory to have CRC and encryption in each communication.

5. The network will always be formed by a master and up to 8 slaves, typically from 2 to 5.

6. We already tried to use an arduino with an RFM95W radio and the lora.h library, changing the LoRaDuplex example but we lost a lot of packages, so we are going to the E220.

I believe is this.

Thanks

Ivan

[Ivan]

Ciao Renzo,

Sono di origine italiana, più precisamente di Genova, ma sono nata in Brasile.

I´ll see the article but will give more details:

a) I thought the broadcast mode was just sending from the master to all (or some) slaves. I need two-way communication between master and slaves, with master asking the slaves if there is anything to send in a pooling.

b) If a slave has data to send, it sends and ends with ack/nack. And master pooling proceeds with the next slave.

Basically that’s it, it’s not hard to make a physical RS-485 network but doing it on lora, I’m a little lost.

Thanks for your patience

Ivan Assaritti

[Author]

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