2 LILYGO TTGO LoraV2.1-1.6 to communicate

[paradisgaston]

Hi, I am new to this type of communication.
I purchased two LILYGO TTGO LoraV2.1-1.6 that I which to exchange text at a distance of 1km.
I configure the 2 devices using your external _components github://swoboda1337/sx127x-esphome.
I change the frequency to 915000000 # 915 MHz in Hz because I wish to use LoRa. And -sx127x.send_packet: "Hello Cabane" instead of raw.

Does your external_compnent support this frequency and sending data. I have define button in each device to send message. But I do not see anything happening.
If you wish, I can send you my code to investigate.
Thanks

[swoboda1337]

The two devices are close together now or 1 km apart?

Can look at the packet mode docs here: https://deploy-preview-4278--esphome.netlify.app/components/sx127x#packet-mode

That config is using FSK and probably has a range of 500 meters.

I haven't added support for LoRa yet but it is on my todo list. I was going to start this week actually.

[swoboda1337]

As for frequency support yes it will support that frequency as long as you bought a device that supports that frequency.

[paradisgaston]

Wow, this is quick. My 2 devices are about 1 meter of each other. My purchased model is LILYGO 868/915MHz. I will check the documentation that you recommend Gaston

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On Thu, Feb 6, 2025 at 15:29 Jonathan Swoboda ***@***.***> wrote: As for frequency support yes it will support that frequency as long as you bought a device that supports that frequency. — Reply to this email directly, view it on GitHub <#5 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AHMIZ3NYUYO3IK6OVDYSGGT2OPAZ3AVCNFSM6AAAAABWUM7MD6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMNBQHEZDSMZRHE> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[paradisgaston]

Hi Jonathan, being totally new to this LoRa communication and working with ChapGPT I came out with this code external_components: - source: github://swoboda1337/sx127x-esphome sx127x: # LoRa Configuration nss_pin: GPIO18 rst_pin: GPIO23 modulation: OOK frequency: 915000000 # 915 MHz in Hz pa_power: 17 on_packet: then: - logger.log: "Received LoRa message: ${data}" - lambda: |- ESP_LOGD("lambda", "packet %s", format_hex(x).c_str()); button: - platform: template name: "Send Message" on_press: then: - sx127x.send_packet: "Hello Cabane" - delay: 100ms # Small delay to ensure the packet is sent - sx127x.set_mode_standby # Set the module back to standby mode A lot less line of code, major difference is frequency ans send_packet instead of raw. I will try you config and let you know what happen Thank you, On Thu, Feb 6, 2025 at 3:38 PM Gaston Paradis ***@***.***> wrote:

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Wow, this is quick. My 2 devices are about 1 meter of each other. My purchased model is LILYGO 868/915MHz. I will check the documentation that you recommend Gaston On Thu, Feb 6, 2025 at 15:29 Jonathan Swoboda ***@***.***> wrote: > As for frequency support yes it will support that frequency as long as > you bought a device that supports that frequency. > > — > Reply to this email directly, view it on GitHub > <#5 (comment)>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/AHMIZ3NYUYO3IK6OVDYSGGT2OPAZ3AVCNFSM6AAAAABWUM7MD6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMNBQHEZDSMZRHE> > . > You are receiving this because you authored the thread.Message ID: > ***@***.***> >

-- Gaston

[swoboda1337]

ChatGTP is useless for anything esphome :)

Just use the config in that link exactly as is but with a different frequency:

# Example configuration entry
sx127x:
  dio0_pin: GPIO26
  nss_pin: GPIO18
  rst_pin: GPIO23
  pa_pin: BOOST
  pa_power: 17
  bitsync: true
  bitrate: 4800
  frequency: 915000000  
  modulation: FSK
  rx_start: true
  payload_length: 8
  sync_value: [0x33, 0x33]
  preamble_size: 2
  preamble_errors: 8
  preamble_polarity: 0x55
  on_packet:
    then:
      - lambda: |-
          ESP_LOGD("lambda", "packet %s", format_hex(x).c_str());

  button:
    - platform: template
      name: "Transmit Packet"
      on_press:
        then:
          - sx127x.send_packet:
             data: [0xC5, 0x51, 0x78, 0x82, 0xB7, 0xF9, 0x9C, 0x5C

[paradisgaston]

I change my config and I am receiving packages TimelevelTagMessage 16:01:23 [D] [lambda:072] packet 327856adba30fb3f 16:02:07 [D] [lambda:076] packet 317856adba31fb3f If this is 1 and a 2 SUCCESS. Would you know how to convert this to readable text ?

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On Thu, Feb 6, 2025 at 3:57 PM Jonathan Swoboda ***@***.***> wrote: Just use the config in that link exactly as is but with a different frequency: # Example configuration entry sx127x: dio0_pin: GPIO26 nss_pin: GPIO18 rst_pin: GPIO23 pa_pin: BOOST pa_power: 17 bitsync: true bitrate: 4800 frequency: 915000000 modulation: FSK rx_start: true payload_length: 8 sync_value: [0x33, 0x33] preamble_size: 2 preamble_errors: 8 preamble_polarity: 0x55 on_packet: then: - lambda: |- ESP_LOGD("lambda", "packet %s", format_hex(x).c_str()); button: - platform: template name: "Transmit Packet" on_press: then: - sx127x.send_packet: data: [0xC5, 0x51, 0x78, 0x82, 0xB7, 0xF9, 0x9C, 0x5C — Reply to this email directly, view it on GitHub <#5 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AHMIZ3MNWQ3T6JPFSE43KGD2OPEC5AVCNFSM6AAAAABWUM7MD6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMNBRGAYDGNBQG4> . You are receiving this because you authored the thread.Message ID: ***@***.***>

-- Gaston

[swoboda1337]

Looks like its working. To do text you can do:

        - sx127x.send_packet:
            data: !lambda |-
              std::string message = "Hello!";
              std::vector<uint8_t> data(message.begin(), message.end());
              data.resize(8);
              return data;

and

  on_packet:
    then:
      - lambda: |-
          std::string message(x.begin(), x.end());
          ESP_LOGD("lambda", "packet %s", message.c_str());

Note the packet size is fixed so I put a resize 8 there (change that if you increase the packet size)

[paradisgaston]

Great, I got my first messages "hello" and "12345678". So the length is fix ? How long can I make it ?| I will have to transmit 2 temp 20.0 20.0 and a water level which will be in integer 1-4, a boolean to trigger a relay and finally a timestamp (or hour:minute)

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On Thu, Feb 6, 2025 at 10:22 PM Jonathan Swoboda ***@***.***> wrote: Looks like its working. To do text you can do: - sx127x.send_packet: data: !lambda |- std::string message = "Hello!"; std::vector<uint8_t> data(message.begin(), message.end()); data.resize(8); return data; and on_packet: then: - lambda: |- std::string message(x.begin(), x.end()); ESP_LOGD("lambda", "packet %s", message.c_str()); Note the packet size is fixed so I put a resize 8 there (change that if you increase the packet size) — Reply to this email directly, view it on GitHub <#5 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AHMIZ3IR7WPPVJTSQ63PZX32OQRIFAVCNFSM6AAAAABWUM7MD6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMNBRHA2DEMZVG4> . You are receiving this because you authored the thread.Message ID: ***@***.***>

-- Gaston

[swoboda1337]

Max size is 64. It would be more efficient to send things as bytes not text.