LG01-N and Heltec ESP32 V2

[david ragot]

Hello,

I have a dragino LG01-N and a heltec esp32 v2 : https://heltec.org/project/wifi-lora-32/

Here is the configuration for the end node heltec esp32 for the lora :

/*

  This is a simple example show the Heltec.LoRa sended data in OLED.

  The onboard OLED display is SSD1306 driver and I2C interface. In order to make the

  OLED correctly operation, you should output a high-low-high(1-0-1) signal by soft-

  ware to OLED's reset pin, the low-level signal at least 5ms.

  OLED pins to ESP32 GPIOs via this connecthin:

  OLED_SDA -- GPIO4

  OLED_SCL -- GPIO15

  OLED_RST -- GPIO16

  

  by Aaron.Lee from HelTec AutoMation, ChengDu, China

  https://heltec.org

  

  this project also release in GitHub:

  https://github.com/Heltec-Aaron-Lee/WiFi_Kit_series

*/

#include "heltec.h"

#include "images.h"

#define BAND    868E6  //you can set band here directly,e.g. 868E6,915E6

#define txPower 14

#define frequency 868E6

#define spreadingFactor 7

#define signalBandwidth 125E3

#define codingRateDenominator 5

#define preambleLength 8

#define syncWord 0x34

unsigned int counter = 0;

String rssi = "RSSI --";

String packSize = "--";

String packet ;

void logo()

{

  Heltec.display->clear();

  Heltec.display->drawXbm(0,5,logo_width,logo_height,logo_bits);

  Heltec.display->display();

}

void setup()

{

   //WIFI Kit series V1 not support Vext control

  Heltec.begin(true /*DisplayEnable Enable*/, true /*Heltec.Heltec.Heltec.LoRa Disable*/, true /*Serial Enable*/, true /*PABOOST Enable*/, BAND /*long BAND*/);

 

  Heltec.display->init();

  Heltec.display->flipScreenVertically();  

  Heltec.display->setFont(ArialMT_Plain_10);

  logo();

  delay(1500);

  Heltec.display->clear();

  

  Heltec.display->drawString(0, 0, "Heltec.LoRa Initial success!");

  Heltec.display->display();

  delay(1000);

  LoRa.setFrequency(frequency);

  LoRa.setSpreadingFactor(spreadingFactor);

  LoRa.setSignalBandwidth(signalBandwidth);

  LoRa.setCodingRate4(codingRateDenominator);

  LoRa.setPreambleLength(preambleLength);

  LoRa.setSyncWord(syncWord);

  delay(1000);

}

void loop()

{

  Heltec.display->clear();

  Heltec.display->setTextAlignment(TEXT_ALIGN_LEFT);

  Heltec.display->setFont(ArialMT_Plain_10);

  

  Heltec.display->drawString(0, 0, "Sending packet: ");

  Heltec.display->drawString(90, 0, String(counter));

  Heltec.display->display();

  // send packet

  LoRa.beginPacket();

  

  LoRa.setTxPower(14,RF_PACONFIG_PASELECT_PABOOST);

  LoRa.print("hello ");

  LoRa.print(counter);

  LoRa.endPacket();

  counter++;

  digitalWrite(LED, HIGH);   // turn the LED on (HIGH is the voltage level)

  delay(1000);                       // wait for a second

  digitalWrite(LED, LOW);    // turn the LED off by making the voltage LOW

  delay(1000);                       // wait for a second

}

And here is the configuration for the dragino LG01-N (last firmware April 21):

The dragino is configured into custom method.

I have several problem :

1/ the logread -f command return nothing from lora :

2/ If I go to /var/channels

there is nothing :

whereas if I consult the documentation, it could be 2 files like on this picture in the documentation : 

So What is the problem? Why I don"t have the files in /var/iot/channels?

(note : var is a symlink to tmp)

Thank you very much for your help.

David

[Edwin]

Hi, David. 

First you need to see the packet arrive the gateway. 

1) What is the output from Heltec?

2) Did heltec sending packets?  

 

 

Best Regards

Edwin Chen

---

From：david ragot <david...@gmail.com>

Date：2021-04-20 22:58

Subject：LG01-N and Heltec ESP32 V2

To：dragino-user <dragin...@googlegroups.com>

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[david ragot]

Thank you for your response.

I do a diff between helted IDE Arduino library and github heltec library. So there some differences.

I have changed the heltec 's library. Instead of using the default library downloaded by the Arduino IDE, I use the Heltec 's github library.

https://github.com/HelTecAutomation/Heltec_ESP32

And now ..... tata !

it 's ok. I 'm receiving packets. (hello 1 hello 2 etc...)

But I have always nothing here : /var/iot/channels/ :

How can I retrieve the data in sysfs of the dragino?

Thank you

David

[Edwin]

 You must send in a match data format so the lg01_pkt_fwd will be to process the data and put them in /var/iot/channels. Please check carfully in the manual. 

 

 

Best Regards

Edwin Chen

---

From：david ragot <david...@gmail.com>

Date：2021-04-21 00:54

Subject：Re: LG01-N and Heltec ESP32 V2

To：dragino-user <dragin...@googlegroups.com>

To view this discussion on the web visit https://groups.google.com/d/msgid/dragino-user/e70a0d7c-9b50-4ff8-a68a-a94ae76846a0n%40googlegroups.com.

[david ragot]

Hello Chen,

It's ok, I add this line for the packet sending for the Heltec :

  LoRa.beginPacket();

  LoRa.setTxPower(14,RF_PACONFIG_PASELECT_PABOOST);

  LoRa.beginPacket();

  LoRa.print("<");

  LoRa.print(device_id);

  LoRa.print(">temperature:=");

  LoRa.print(tem);

  LoRa.print("&humidity=");

  LoRa.print(hum); 

  LoRa.endPacket();

  delay(10000);

And I got this : 

The custom  script save well the data into the file "toto"

That's good !!

Thank you for your help.

David