Endnode IM880B, arduino and distance sensor

End Devices (Nodes)
1

Hello everyone,

Today I have an im880A node from IMST and I am wanting to transmit the measurements of a distance sensor.

I am not succeeding in my code.

I can send hello world but I do not send the sensor data.

Can I borrow some please?

Below is a part of the code and its error.

The error:
initializer fails to determine size of ā€˜__cā€™

Part of my code

for (uint8_t i = 0; i < SONAR_NUM; i++) { // Loop through each sensor and display results.
delay(50); // Wait 50ms between pings (about 20 pings/sec). 29ms should be the shortest delay between pings.

  unsigned long value = sonar[i].ping_cm();
  String stringValue = "";
  char charValue[5];
  stringValue += value;
  strcpy(charValue, stringValue.c_str());

  // send out a hello world every 30 sec ( =6* 50*100 ms)
  // (due to duty cycle restrictions 30 sec is recommended
  if ((loopCnt > 1) && (loopCnt % (6 * 50)) == 0) {
    // send out a simple HelloWorld messsage
    debugMsg(F("Sending HelloWorld message...\n"));

    // prepare TX data structure
    txData.Port = 0x01;
    txData.Length = sonar[i].ping_cm();
    strcpy_P((const char*) txData.Payload, PSTR(charValue));

Thanks!!

2

Hey Guys!!

Now i get my code working

void loop()
{
// check of OTAA procedure has finished
if (RIB.ModemState == ModemState_Connected) {

  // send out a hello world every 30 sec ( =6* 50*100 ms)
  // (due to duty cycle restrictions 30 sec is recommended
  if ((loopCnt > 1) && (loopCnt % (6 * 50)) == 0) {
    // send out a simple HelloWorld messsage
    debugMsg(F("Sending HelloWorld message...\n"));

    for (uint8_t i = 0; i < SONAR_NUM; i++) { // Loop through each sensor and display results.
    delay(50); // Wait 50ms between pings (about 20 pings/sec). 29ms should be the shortest delay between pings.
    unsigned long value = sonar[i].ping_cm();
    String stringValue = "";
    stringValue += value;
    char charValue[5];
    stringValue += value;
    strcpy(charValue, stringValue.c_str());

    // prepare TX data structure
    txData.Port = 0x01;
    txData.Length = sonar[i].ping_cm();
    strcpy_P((char*) txData.Payload, charValue);

dado%20sensor%20de%20nivel

My Payload Function

function Decoder(bytes, port) {
// Decode plain text; for testing only
if
(bytes[2] === 0)
return {
cm: String.fromCharCode.apply (null, bytes.slice(0, 2))
};
else
return {
cm: String.fromCharCode.apply (null, bytes.slice(0, 3))
};
}

1 Like