Bike interface OBD

Projects Discussion and Showcase Device Hacking
180

aster94:
seems that the delay of 10ms between two bytes is not needed

#define debug Serial

#define bike Serial1
#define TX_PIN 18
byte message0[] = {0xFE, 0x04, 0xFF, 0xFF};
byte message1[] = {0x72, 0x05, 0x00, 0xF0, 0x99};

void setup()
{
 debug.begin(115200);
}

void loop()
{
 char incomingCommand = 0;
 while (debug.available() > 0)
 {
   incomingCommand = debug.read();
   debug.print("\nCommand: ");
   debug.println(incomingCommand);
 }

if (incomingCommand == 'S')
 {
   initHonda();
 }
 checkResponse();
}

void checkResponse()
{
 while (bike.available() > 0)
 {
   byte incomingByte = bike.read();
   debug.print(incomingByte, HEX);
   debug.print(' ');
 }
}

void initHonda()
{
 debug.println("Starting sequence");
 bike.end();
 pinMode(TX_PIN, OUTPUT);

digitalWrite(TX_PIN, LOW);
 delay(70);

digitalWrite(TX_PIN, HIGH);
 delay(120);

bike.begin(10400);

sendRequest(message0, sizeof(message0));
 // No response is expected

// wait 25ms and avoid echo
 debug.print("Echo: ");
 uint32_t start_time = millis();
 while (start_time + 25 > millis())
 {
   checkResponse();
 }

sendRequest(message1, sizeof(message1));
 // respond: 02 04 00 FA
 debug.println("\nWaiting response");
}

void sendRequest(uint8_t request[], uint8_t len)
{
 for (uint8_t i = 0; i < len; i++)
 {
   bike.write(request[i]);
 }
 bike.flush(); // wait to send all
}




if this doesn't work the problem is in the wiring, please could you post some pictures and a schematics?

No Luck. I got the same response as before:

09:11:34.417 -> Command: S
09:11:34.417 -> 
09:11:34.417 -> Starting sequence
09:11:34.619 -> Echo: F8 0 FF 
09:11:34.653 -> Waiting response
09:11:34.653 -> 0 0

Here's an album with pictures:

[Album] imgur.com

Let me know if I can clarify anything with more pics.

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