Re: Arduino OBD-II UART Adapter FAQs- DFRobot Forum

2015-01-08 00:22:00 Thinking about setting up an obd2 Bluetooth adapter with my iPad mini. Any suggestions on software/adapters that work well with the soul are appreciated Abrahamer

2014-05-04 10:13:21 With Arduino 1.0.5 and the current OBD libraries from github I get just the last two messages about the missing function.
Try https://github.com/stanleyhuangyc/ArduinoOBD/blob/master/libraries/OBD/examples/rpm_led_uart/rpm_led_uart.ino this should work (haven't tried but compiled without errors). orpheus88

2014-04-25 03:15:29 Dear Stanley,

Could you please give us a very simple scetch including library file just to read RPM, because below code giving a lot of error.

Mykoch

[quote="stanleyhuang"]
Here is a simplest sketch:
[code]#include <OBD.h>

COBD obd; /* for UART version */
//COBDI2C obd; /* for I2C version */

void setup()
{
// we'll use the debug LED as output
pinMode(13, OUTPUT);
// start communication with OBD-II adapter
obd.begin();
// initiate OBD-II connection until success
while (!obd.init());
}

void loop()
{
int value;
// save engine RPM in variable 'value', return true on success
if (obd.ReadSensor(PID_RPM, value)) {
// light on LED on Arduino board when the RPM exceeds 5000
digitalWrite(13, value > 5000 ? HIGH : LOW);
}
}[/code]
[/quote] mykoch

2014-04-25 03:06:57 When we run this code it give below errors;

In file included from sketch_apr24a.ino:1:
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:61: error: 'byte' has not been declared
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:64: error: 'byte' has not been declared
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:65: error: 'byte' has not been declared
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:66: error: 'byte' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:67: error: 'byte' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:68: error: 'byte' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:69: error: 'byte' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:70: error: 'byte' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:72: error: 'getResponse' declared as a 'virtual' field
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:72: error: expected ';' before '(' token
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:73: error: 'byte' has not been declared
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:74: error: 'byte' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:81: error: 'byte' has not been declared
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:82: error: 'byte' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:84: error: 'uint8_t' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:88: error: 'uint16_t' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:92: error: 'uint8_t' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:96: error: 'int16_t' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h: In constructor 'COBD::COBD()':
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:58: error: class 'COBD' does not have any field named 'dataMode'
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:58: error: class 'COBD' does not have any field named 'errors'
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:58: error: class 'COBD' does not have any field named 'm_state'
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h: At global scope:
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:117: error: 'uint32_t' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:118: error: 'uint16_t' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:123: error: 'uint16_t' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:124: error: 'uint8_t' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:125: error: 'uint8_t' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:129: error: 'uint32_t' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:130: error: 'uint32_t' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:135: error: 'uint8_t' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:136: error: 'uint8_t' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:137: error: 'uint16_t' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:138: error: 'uint8_t' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:143: error: 'byte' has not been declared
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:145: error: 'byte' has not been declared
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:148: error: 'uint16_t' has not been declared
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:149: error: 'byte' has not been declared
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:149: error: 'byte' has not been declared
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:150: error: 'byte' has not been declared
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:150: error: 'byte' has not been declared
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:153: error: 'uint32_t' has not been declared
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:156: error: 'byte' has not been declared
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:156: error: 'uint8_t' has not been declared
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:156: error: 'byte' has not been declared
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:156: error: 'byte' has not been declared
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:157: error: 'byte' does not name a type
C:\Arduino\arduino-1.5.4\libraries\OBD/OBD.h:158: error: 'byte' does not name a type
sketch_apr24a.ino: In function 'void loop()':
sketch_apr24a:20: error: 'class COBD' has no member named 'ReadSensor'

[quote="stanleyhuang"]
Here is a simplest sketch:
[code]#include <OBD.h>

COBD obd; /* for UART version */
//COBDI2C obd; /* for I2C version */

void setup()
{
// we'll use the debug LED as output
pinMode(13, OUTPUT);
// start communication with OBD-II adapter
obd.begin();
// initiate OBD-II connection until success
while (!obd.init());
}

void loop()
{
int value;
// save engine RPM in variable 'value', return true on success
if (obd.ReadSensor(PID_RPM, value)) {
// light on LED on Arduino board when the RPM exceeds 5000
digitalWrite(13, value > 5000 ? HIGH : LOW);
}
}[/code]
[/quote] mykoch

2014-04-19 07:34:53 Stanley,

I have dropped you a couple of mails on this but still no answer. We have ascertained that the adapter you sent in my kit was the wrong one and you are going to send me an adapter but nothing has turned up in. Mistakes happen, thats fine, I just need to know when I will be getting the adapter so I can actually use it with my kit.

Steve. steve.newt

2014-03-31 03:37:44 Stanley, could you expand on the difference of the available lead-out cables? sejtam

2014-03-24 14:31:34 Stanley, I dropped you an email with pictures so you can see what I am talking about.

Thanks,
Steve. steve.newt

2014-03-23 05:10:31 Hi,

I got the #3 kit which I have fitted together and got a basic script working. I have a couple of queries which I couldn't work out from the photos. It states which port to use for both the GPS and OBDII adapter. The GPS is a flat plug which could be plugged in either way around, I assume plugging in the wrong way around would do damage so can we have a photo or instruction to assist please? My more challenging query or possibly stupid one is that the OBDII adapter plug does not appear to fit the socket. It is 4 pin but the plastic plug does seem slightly over sized for the socket, I did try to force it a little but was worried I break it. If I can see a photo and/or get some reassurance in case I am doing something stupid that would be great.

Cheers,
Steve. steve.newt

2013-12-23 13:08:08 Please add to the FAQ the following questions, and you can safe erase my post after:

1. Your chipset used for CAN comunication is compatible or produced by the ELM company?
1.1 In case of a positive answer, does this have support for all the commands described in the datasheet?
1.2 What version (regarding the ELM compatibility) has the chip?
2. Did you ever tried to measure the current consumed by your device ? In the ELM datasheet is an example that consumes less than 1mA. Also, what power saving functionalities has your chipset, and what is the current used in idle (in the latest version of the A model, where there is mentioned an improvement of the DC power supply)?
3. The devices outputs current to the arduino even when the engine is off? Let's assume that the OBD has power when the engine is off.
4. Can you comunicate via CAN when the engine is off ? Let's assume that the CAN-LO is on and you can cumunicate with other devices. Can this be possible with the Arduino OBD too?
5. It would be nice to have some photos with the device opened, so we can examinate the board connections.

Beside that, I would see as an improvement: In the ELM datasheet is the pin 16 which can be used for power-saving functionalities. I think that for some users (like me), it would be useful to have that pin as an output too.

Thanks in advance :)
tilutza

2013-10-17 20:32:46 Stanley,
can you please provide a simple sketch of taking readings of the rpm? tried to search for reference but mostly I manage to find only integration of OBD2 TTL adapter with a shield and arduino.
For your info, i only posses only the UART adapter and a unit of Arduino Mega for now. do i need to buy an extra shield to allow me to use it?
azhan