Problem getting data from the ELM327

[miguelgarcia42]

Hey guys , im getting always the same error using ELMduino library , right now im using OBDsim to simulate the elm327 on my PC via bluetooth (i get the exact same response when using it in my car with a standard ELM327 bluetooth adapter) .
I can make it work with the softwareSerial library but im having trouble converting the rpm value from hexadecimal to decimal , thats why im trying ELMduino.

The code im using:

#include <SoftwareSerial.h>
#include "ELMduino.h"


SoftwareSerial mySerial(8, 9); // RX, TX
ELM327 myELM327;


uint32_t rpm = 0;


void setup()
{
  Serial.begin(115200);
  mySerial.begin(115200);
  myELM327.begin(mySerial, true, 2000);
}


void loop()
{
  float tempRPM = myELM327.rpm();

  if (myELM327.nb_rx_state == ELM_SUCCESS)
  {
    rpm = (uint32_t)tempRPM;
    Serial.print("RPM: "); Serial.println(rpm);
  }
  else if (myELM327.nb_rx_state != ELM_GETTING_MSG)
    myELM327.printError();
}

The serial monitor loops this and the rpm is always 884:

This is the OBDSim log , it is getting the commands to reset and the queries.

Hope someone can help me fix this , thanks :)

[PowerBroker2]

If the query is 010C1, then the response header should be 410C1. However, it seems the sim is sending a response header of 410C0 for some reason. This means ELMduino will not recognize the header and eventually time out.

[miguelgarcia42]

If the query is 010C1, then the response header should be 410C1. However, it seems the sim is sending a response header of 410C0 for some reason. This means ELMduino will not recognize the header and eventually time out.

Any sugestion on how i can fix it? I get the same error with the elm327 plugged to my car

[PowerBroker2]

Seems like both your car and sim are screwed up, not sure how to fix that. Perhaps you could jerry-rig the lib src files to work around the issue.

What is your car's make/model/year?

[miguelgarcia42]

Seems like both your car and sim are screwed up, not sure how to fix that. Perhaps you could jerry-rig the lib src files to work around the issue.

What is your car's make/model/year?

Oh ok :/ i will try to find a way to fix it , it is a 2017 honda civic hatchback

[PowerBroker2]

Interesting, I was expecting a pre-2008 car since it doesn't seem to be adhering to the OBD2 standard