Telematics General

Super slow (20 seconds) data from UART OBD II connector.

userHead evan.stoddard 2014-04-21 11:48:37 6974 Views5 Replies
I'm making a speedometer with some nixie tubes that I have connected with serial. I'm using the supplied library for the car connector and I'm using the mega 2560 so I can have multiple hardware serial connections. I originally did this with software serial and switched to see if that was the problem. I am receiving updates for speed maybe every 20 seconds. Here is my code:

[code]

#import <Arduino.h>

#include <OBD.h>


int ones = 0;
int tens = 0;

int kphValue = 0;
int mphValue = 0;

int rpmValue = 0;

COBD obd;

void setup(){


Serial2.begin(9600);
obd.begin();
//initiate OBD-II connection until success
while (!obd.init()){
Serial2.print("$0,Y,Y,255,255,000,000$0,Y,Y,255,255,000,000!");
delay(1000);
Serial2.print("$0,Y,Y,000,000,000,000$0,Y,Y,000,000,000,000!");
delay(1000);
}

}

void loop(){

obd.read(PID_RPM, rpmValue);
delay(100);

obd.read(PID_SPEED, kphValue);
delay(100);
kphToMPH();

String onesString = String(ones);
String tensString = String(tens);
String payloadString;
if(rpmValue<3000){
payloadString = "$" + onesString + ",N,N,255,000,255,000$" + tensString + ",N,N,255,000,255,000!";
Serial2.print(payloadString);
}
else if(rpmValue>=5000){
payloadString = "$" + onesString + ",N,N,255,255,000,000$" + tensString + ",N,N,255,255,000,000!";
Serial2.print(payloadString);
}
else if(rpmValue>=3000){
payloadString = "$" + onesString + ",N,N,255,255,030,000$" + tensString + ",N,N,255,255,030,000!";
Serial2.print(payloadString);
}

}

void splitDigits(int input_number)
{

ones = (input_number%10);
tens = ((input_number/10)%10);

}

void kphToMPH()
{

mphValue = kphValue * 0.621371;
splitDigits(mphValue);

}
[/code]
2014-04-25 16:29:54 Nope... still super slow. userHeadPic evan.stoddard
2014-04-23 19:16:43 It's still super slow. userHeadPic evan.stoddard
2014-04-22 11:26:39 Would this be better?

[code]

#import <Arduino.h>

#include <OBD.h>

int ones = 0;
int tens = 0;

int kphValue = 0;
int mphValue = 0;

int rpmValue = 0;

String onesString;
String tensString;
String payloadString;
String rpmString;
COBD obd;

void setup(){
 

  Serial2.begin(9600);
  obd.begin();
//initiate OBD-II connection until success
  while (!obd.init()){
  Serial2.print("$0,Y,Y,255,255,000,000$0,Y,Y,255,255,000,000!");
    delay(1000);
    Serial2.print("$0,Y,Y,000,000,000,000$0,Y,Y,000,000,000,000!");
    delay(1000);
  }

}

void loop(){
    onesString = String(ones);
    tensString = String(tens);
    payloadString;
    rpmString;

    if(obd.read(PID_RPM, rpmValue)){
      if(rpmValue<3000){
      rpmString =",N,N,255,000,255,000";
   
      }
      else if(rpmValue>=5000){
        rpmString = ",N,N,255,255,000,000";
      }
      else if(rpmValue>=3000){
        rpmString = ",N,N,255,255,030,000";
      }
    }
   
    if(obd.read(PID_SPEED, kphValue)){
   
        kphToMPH();
 
      payloadString = "$" + onesString + rpmString + "$" + tensString + "rpmString" + "!";
 
      if(Serial2.available()){
       
        Serial2.print(payloadString);
       
      }
    }
}

void splitDigits(int input_number)
{
 
  ones = (input_number%10);
  tens = ((input_number/10)%10);
 
}

void kphToMPH()
{
 
mphValue = kphValue * 0.621371;                                           
splitDigits(mphValue);

}
[/code]
userHeadPic evan.stoddard
2014-04-22 11:02:26 Would checking for serial availability be beneficial? userHeadPic evan.stoddard
2014-04-22 09:41:44 I did that and had the same issues.  userHeadPic evan.stoddard