How to send/receive uint16_t/word data on arduino mkr wan 1310

Using Arduino Networking, Protocols, and Devices
1

Hello, i have a project where i collect data from various sensors installed on an mkr wan 1310 and need to send the acquired data to another 1310 board. To do that i want to give each sensor an unique ID and store said ID and Data in one byte and one word respectively. I managed to send and receive the ID without much problem but i can't manage to send over the data. I need to save the value 1022 for example, but even if i use a uint16_t and send the desired value, on the reciving end it maxes out at 0xFF (255) and i have no idea why.

2

use a structure and send the structure

struct __attribute__((packed)) t_info {
  byte id;
  uint16_t data;
};

void setup() {
  // create a variable to store the message
  t_info myInfo;
  // fill in the fields
  myInfo.id = 0x42;
  myInfo.data = 1022;
  // send it. (use &myInfo for the start of the buffer and sizeof myInfo for the number of bytes)
  // ....
}

void loop() {}
1 Like
3

Hey, thank you for the advice. I tried to make the structure and send it in the packet instead but i can't seem to make the packet to send it as i receive an error when trying to use LoRa.print/write.

4

post your code

5 
#include <SPI.h>
#include <LoRa.h>   


struct __attribute__((packed)) t_info {
  byte id;
  uint16_t data;
};

void setup() {

  if (!LoRa.begin(434E6)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }

  LoRa.setSpreadingFactor(12);
  LoRa.setSignalBandwidth(250000);
  LoRa.setCodingRate4(8);


  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  digitalWrite(2, HIGH);
  digitalWrite(3, LOW);


  t_info myInfo;

  myInfo.id = 0x42;


}


void loop() {



 if(digitalRead(2)== HIGH)
  {
    digitalWrite(3, HIGH);
    digitalWrite(2, LOW);


     
  }else if(digitalRead(2)== LOW)
        {
          digitalWrite(2, HIGH);
          digitalWrite(3, LOW);

        
        }

 
  myInfo.data = analogRead(A5);
  

  // send packet
  LoRa.beginPacket();
  LoRa.write(myInfo);
  LoRa.endPacket();

  delay(3000);
}
6

What happened to code tags?

7

Sorry about that. New here and work's been pretty hectic. Didn't know about that option. It should be alright now i think?

8

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