Development

Communication / CAN Bus:

» CAN Bus 05: General PIDs

This sketch shows how to use the general function CiARequest and the standard OBD-II PIDs codes to get data from the vehicle. This codes are used to request data from a vehicle, used as a diagnostic tool.

Required Materials

1 x Waspmote
1 x Battery
1 x CAN Bus
1 x OBD cable

Notes

- Waspmote must be powered with a battery
- CAN Bus was designed to work in automotive applications, but it can be used in other communication areas.
- The CAN Bus library integrates the most important PID functions, but it does not include all of them.
- This example can be executed in Waspmote v12 and Waspmote v15

Code

/*  
 *  ------ [CAN-Bus_05] General PIDs -------- 
 *  
 *  This sketch shows how to use the general function CiARequest and the 
 *  standard OBD-II PIDs codes to get data from the vehicle. This codes 
 *  are used to request data from a vehicle, used as a diagnostic tool.
 *
 *  Copyright (C) 2014 Libelium Comunicaciones Distribuidas S.L. 
 *  http://www.libelium.com 
 *  
 *  This program is free software: you can redistribute it and/or modify  
 *  it under the terms of the GNU General Public License as published by  
 *  the Free Software Foundation, either version 3 of the License, or  
 *  (at your option) any later version.  
 *   
 *  This program is distributed in the hope that it will be useful,  
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of  
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the  
 *  GNU General Public License for more details.  
 *   
 *  You should have received a copy of the GNU General Public License  
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.  
 *
 *  Version:          0.1 
 *  Implementation:   Luis Antonio Martin & Ahmad Saad
 */

// Include always these libraries before using the CAN Bus functions
#include <WaspCAN.h>

#define myPID 0x00 // <------- Define here your PID

void setup()
{ 	
  // Turn on the USB 
  USB.ON();
  delay(100);

  // Print initial message 
  USB.println("Initializing CAN Bus...");	

  // Configuring the BUS at 500 Kbit/s
  CAN.ON(500);   
  USB.println("CAN Bus initialized at 500 KBits/s");  
}

void loop()
{
  int data;

  // Read the value of RPM if the engine 
  CAN.CiARequest(myPID);


  if (CAN.messageRx.id == ID_RESPONSE) 
  {
    data = uint16_t(CAN.messageRx.data[3]) ; // <-------- Insert the formula here
    CAN.printMessage(&CAN.messageRx);
  }

  // Print received data in the serial monitor
  USB.print("Returned data: "); 
  USB.print(data);
  USB.print("\n");
  delay(1000); 

}






Output

H#
Initializing CAN Bus...
CAN Bus initialized at 500 KBits/s
id: 7E8 rtr: 0 => data: 6,41,0,FF,FF,FF,FF,0
Returned data : 255

Quick Publish: