Development v12

Warning - Product Update

All the resources present on this section belong to Waspmote v12, Waspmote Plug & Sense! v12 and Meshlium v3.8.

If you have a Waspmote v15, Waspmote Plug & Sense! v15 or Meshlium v4.0 please go to the new Development Section.

Check what is your version and what are the differences between the old and the new one in this document.

» 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

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