Beginner Arduino user here. I don't have coding experience. I've spent quite a few hours learning the basics of Arduino with some starter tutorials. My young children think I'm very cool because I can make cool blinky lights. But I'm still well over my head on my project at hand.
I'm looking to create a solution with my Arduino Uno R3 + CAN-bus shield (Seed CAN-BUS Shield V2.0) and HC-06 RS232 bluetooth serial transceiver module. This is an automotive application whereby I'm taking data from one output and relaying it via Bluetooth for consumption on an Android application. I have an engine control unit from Haltech. This ECU broacasts CAN data that the user can consume and use as they wish. My aim is to take this CAN data and display it on a 3rd party android application called "Torque." It will be my user interface for virtual gauges - reading all sorts of information that is broadcast from the ECU - such as fuel pressure, timing, air-fuel ratio, etc.
The high-level architecture is like this:
[ECU] ---CAN H, Can L (in OBD format) --- [CAN-bus Shield/UNO R3] --> [HC-06] ---> [Torque Application]
I have been able to prove out some components of this solution, but I'm lacking knowledge to piece it all together.
With the can-bus shield, and an example from the seed can-bus library, I have been able to read the CAN data into the serial port of my laptop successfully, indicating the data coming from the ECU is valid:
// demo: CAN-BUS Shield, receive data with check mode
// send data coming to fast, such as less than 10ms, you can use this way
// loovee, 2014-6-13
#include <SPI.h>
#define CAN_2515
// #define CAN_2518FD
// the cs pin of the version after v1.1 is default to D9
// v0.9b and v1.0 is default D10
// Set SPI CS Pin according to your hardware
// For Wio Terminal w/ MCP2518FD RPi Hat：
// Channel 0 SPI_CS Pin: BCM 8
// Channel 1 SPI_CS Pin: BCM 7
// Interupt Pin: BCM25
// *****************************************
// For Arduino MCP2515 Hat:
// SPI_CS Pin: D9
#ifdef CAN_2515
#include "mcp2515_can.h"
const int SPI_CS_PIN = 9;
const int CAN_INT_PIN = 2;
mcp2515_can CAN(SPI_CS_PIN); // Set CS pin
#endif
void setup() {
SERIAL_PORT_MONITOR.begin(1000000);
#ifdef CAN_2518FD
while (0 != CAN.begin((byte)CAN_1M)) { // init can bus : baudrate = 500k
#else
while (CAN_OK != CAN.begin(CAN_1000KBPS)) { // init can bus : baudrate = 500k
#endif
SERIAL_PORT_MONITOR.println("CAN init fail, retry...");
delay(100);
}
SERIAL_PORT_MONITOR.println("CAN init ok!");
}
void loop() {
unsigned char len = 0;
unsigned char buf[8];
if (CAN_MSGAVAIL == CAN.checkReceive()) { // check if data coming
CAN.readMsgBuf(&len, buf); // read data, len: data length, buf: data buf
unsigned long canId = CAN.getCanId();
SERIAL_PORT_MONITOR.println("-----------------------------");
SERIAL_PORT_MONITOR.print("Get data from ID: 0x");
SERIAL_PORT_MONITOR.println(canId, HEX);
for (int i = 0; i < len; i++) { // print the data
SERIAL_PORT_MONITOR.print(buf[i], HEX);
SERIAL_PORT_MONITOR.print("\t");
}
SERIAL_PORT_MONITOR.println();
}
}
The ECU outputs CAN data at 1Meg rate, so I adjusted the above code to align to that speed, and the output on the serial monitor was satisfactory. So that's good.
Separately, I have gotten the the Bluetooth to connect to my Android phone and the Torque application. I'm not sure if it's relevant, but I plugged the Bluetooth transceiver TX and RX into digital pins 2 and 3 in order to name and validate communication with the Bluetooth.
This bring us to current. At this point, what I think I'm looking to take the CAN data that I'm able to view on the serial monitor, and route it instead to the Bluetooth via the TX(?) pin on the HC-06. I'm thinking the data transmission via Bluetooth to the android app need not have much of the code that makes it readable for me in the serial monitor. Perhaps sending in raw OBD format (as comes from the ECU) is best so the Torque App can consume and display. That leads me to here - I don't know where to go from where I currently reside. I appreciate any support to help me progress in my journey.