How to send two or more ADC values to chirpstack

#1

Hi everyone, I need to send two analog data (potentiometer), but I have problems when I send to chirpStack.

This is a example only in the arduino ide, its ok, works.

// I use the device LoRa 32 V2 915 Mhz
/* pins 25 and 37 I will use to read the data that i need to send*/
#define AnPin1 25//to read the analog potenciometer
#define AnPin2 37//to read the analog potenciometer
int val1, val2;

/I think that the value that I want to send through lora must be string, this is the reason text1 and text2/
String text1 ="";
String text2 ="";

void setup()
{
Serial.begin(115200);
Serial.setTimeout(50);

}

void loop()
{
val1 = analogRead(AnPin1);
val2 = analogRead(AnPin2);
text1 = (String)val1;
text2 = (String)val2;

/* I made this part to probe that val1 was convert to string, not problem val1 is a string */
if (text1 == “55” or text1 == “47” or text1 == “59” or text1 == “25” ){
Serial.println(“Hi, text1 is a string”);
}
//here I should send to chirpstack
Serial.println(text1);
Serial.println(text2);
Serial.println();
delay(1000);
}

Can you help me please to do the same with chirpstack.

I’m using the DHT11 example, but i don’t know what method I must use to send some values to the chirpstack. Please help me.

#2

you can just use the lorawan examples.
sneding data to any LoRaWAN server is the same.

is your gateway connected to your chirpstack server?

1 Like
#3

Thank you. Yes with chirpstack.

#4

@karl for example in the OTAA_OLED you can find this two lines at the void loop ()

uint8_t msg[] = “Msg test 43”;
PrepareMsgFrame( AppPort, msg , sizeof(msg)-1);

You must change the msg[] to what u wanna to send. Furthermore you need a decoder at chirpstack side in order to check the received msg.

1 Like
#5

Hi @andrelmbraga1, I tried this

uint8_t num = 44;
// int num = 44;//this represent the analog data
uint8_t msg[] = “Msg test 43”;
String msg1 ="";// to convert num to string
msg1 = (String)num;
PrepareMsgFrame( AppPort, msg , sizeof(msg)-1);
PrepareMsgFrame( AppPort, msg1 , sizeof(msg1)-1);// here is the problem
LoRa.DeviceStateSend();

IT GIVES THIS ERROR

Arduino: 1.8.10 (Linux), Board: “WiFi LoRa 32(V2), Disabled, default_8MB, 240MHz (WiFi/BT), QIO, 80MHz, 8MB (64Mb), 921600, None”

/tmp/arduino_modified_sketch_97713/OTAA_OLED.ino: In function ‘void loop()’:
OTAA_OLED:200:54: error: cannot convert ‘String’ to ‘uint8_t* {aka unsigned char*}’ for argument ‘2’ to ‘void PrepareMsgFrame(uint8_t, uint8_t*, uint8_t)’
PrepareMsgFrame( AppPort, msg1 , sizeof(msg1)-1);// here is the problem
^
Multiple libraries were found for “board.h”
Used: /home/karl/Arduino/libraries/ESP32_LoRaWAN
Multiple libraries were found for “SPI.h”
Used: /home/karl/.arduino15/packages/Heltec-esp32/hardware/esp32/0.0.4/libraries/SPI
Multiple libraries were found for “Wire.h”
Used: /home/karl/.arduino15/packages/Heltec-esp32/hardware/esp32/0.0.4/libraries/Wire
exit status 1
cannot convert ‘String’ to ‘uint8_t* {aka unsigned char*}’ for argument ‘2’ to ‘void PrepareMsgFrame(uint8_t, uint8_t*, uint8_t)’

DO YOU KNOW SOME EXAMPLE TO SOLVE THIS ISSUE, PLEASE.