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kenny-macchina/A0_VehicleData.ino

Last active March 15, 2023 14:06
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A0_VehicleData.ino
#include <esp32_can.h>
uint8_t codes[4] = {5, 0xB, 0xC, 0xD};
int idx = 0;
uint32_t tick = 0;
const int led_pin = 13;
char msg_buf[10];
int led_state = 0;
int ledState = LOW; // ledState used to set the LED
unsigned long previousMillis = 0; // will store last time LED was updated
const long interval = 1000; // interval at which to blink (milliseconds)
void setup()
{
pinMode(led_pin, OUTPUT);
digitalWrite(led_pin, LOW);
// Start Serial port
Serial.begin(115200);
CAN0.setCANPins(GPIO_NUM_4, GPIO_NUM_5);
CAN0.begin(500000);
Serial.println("Ready ...!");
int filter;
//extended
for (filter = 0; filter < 3; filter++)
{
Can0.setRXFilter(filter, 0, 0, false);
}
}
void loop()
{
CAN_FRAME incoming;
if (Can0.available() > 0)
{
Can0.read(incoming);
if (incoming.id > 0x7DF && incoming.id < 0x7F0)
{
processPID(incoming);
}
}
static unsigned long l = 0;
unsigned long t = millis();
if ((t - l) > 50)
{
sendPIDRequest(0x7DF, 0xC);
sendPIDRequest(0x7DF, 0xD);
sendPIDRequest(0x7DF, 5);
l = t;
}
}
void sendPIDRequest(uint32_t id, uint8_t PID)
{
CAN_FRAME frame;
frame.id = id;
frame.extended = 0;
frame.length = 8;
for (int i = 0; i < 8; i++)
frame.data.bytes[i] = 0xAA;
frame.data.bytes[0] = 2; //2 more bytes to follow
frame.data.bytes[1] = 1;
frame.data.bytes[2] = PID;
Can0.sendFrame(frame);
}
int lastTemp=-1;
float lastpsi=-1;
int lastRPM=-1;
int lastMPH=-1;
void processPID(CAN_FRAME &frame)
{
int temperature;
float psi;
int RPM;
int MPH;
if (frame.data.bytes[1] != 0x41)
return; //not anything we're interested in then
switch (frame.data.bytes[2])
{
case 5:
temperature = frame.data.bytes[3] - 40;
if (temperature!=lastTemp)
{
Serial.print("Coolant temperature (C): ");
Serial.println(temperature);
lastTemp=temperature;
}
break;
case 0xB:
psi = frame.data.bytes[3] * 0.145038; //kPA to PSI
psi = psi - 14.8;
//psi = psi * 100;
if (psi!=lastpsi)
{
Serial.print("Manifold abs pressure (psi): ");
Serial.println(psi);
lastpsi=psi;
}
break;
case 0xC:
RPM = ((frame.data.bytes[3] * 256) + frame.data.bytes[4]) / 4;
if (RPM!=lastRPM)
{
Serial.print("Engine RPM: ");
Serial.println(RPM);
sprintf(msg_buf, "%d", RPM);
lastRPM=RPM;
}
break;
case 0xD:
MPH = frame.data.bytes[3] * 0.621371;
if (MPH!=lastMPH)
{
Serial.print("Vehicle Speed (MPH): ");
Serial.println(MPH);
lastMPH=MPH;
}
break;
}
}
@weeblebiker
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weeblebiker commented Mar 15, 2023 •
edited

//A0 example that works

#include <esp32_can.h>

#include <FastLED.h>
#define A0_LED_PIN 2 //pin that controls led
#define A0_NUM_LEDS 1 //just a single RGB but the code is for led strips
#define BRIGHTNESS 64 //arbitrary
#define LED_TYPE WS2812B
#define COLOR_ORDER GRB
CRGB leds[A0_NUM_LEDS]; //just a single RGB but the code is for led strips

#define UPDATES_PER_SECOND 100

uint8_t codes[4] = { 0x05, 0x0B, 0x0C, 0x0D };
int idx = 0;
uint32_t tick = 0;

char msg_buf[10];

void setup() {
delay(1000); //power bounce delay for OBD plug power

// Start Serial port
Serial.begin(115200);

pinMode(13, OUTPUT); // RGB power transistor ,note: turn off when sleep mode figured out
digitalWrite(13, LOW);
delay(100); //power bounce delay
FastLED.addLeds<LED_TYPE, A0_LED_PIN, COLOR_ORDER>(leds, A0_NUM_LEDS).setCorrection(TypicalLEDStrip);
FastLED.setBrightness(BRIGHTNESS);
leds[0] = CRGB::Red; //booting color
FastLED.show();
pinMode(21, OUTPUT); // to HSC_S: CAN transiever silence pin (pull low to communicate, pin high or floating will silence transceiver)
digitalWrite(21, LOW);
CAN0.setCANPins(GPIO_NUM_4, GPIO_NUM_5); //pulled from SavvyCAN code, it works
CAN0.begin(500000); //pulled from SavvyCAN code, works

Serial.println("Ready ...!");

int filter;
//extended
for (filter = 0; filter < 3; filter++) {
Can0.setRXFilter(filter, 0, 0, false);
}
}

void loop() {
leds[0] = CRGB::Black;
FastLED.show();

CAN_FRAME incoming;

if (Can0.available() > 0) {
Can0.read(incoming);
if (incoming.id > 0x7DF && incoming.id < 0x7F0) {
processPID(incoming);
leds[0] = CRGB::Blue; //flickers blue every time a response is processed
FastLED.show();
//Serial.println("Recieved");
}
}

static unsigned long l = 0;
unsigned long t = millis();

if ((t - l) > 1000) {
sendPIDRequest(0x7DF, 0x05);
sendPIDRequest(0x7DF, 0x0B);
sendPIDRequest(0x7DF, 0x0C);
sendPIDRequest(0x7DF, 0x0D);
l = t;
}
}

void sendPIDRequest(uint32_t id, uint8_t PID) {
CAN_FRAME frame;
frame.id = id;
frame.extended = 0;
frame.length = 8; //library automatically populates remaining bytes with 0x00 in not defined, may be helpful to define all 8 in code

for (int i = 0; i < 8; i++)
frame.data.bytes[i] = 0xAA;
frame.data.bytes[0] = 2; //2 more bytes to follow
frame.data.bytes[1] = 1;
frame.data.bytes[2] = PID;
Can0.sendFrame(frame);
//leds[0] = CRGB::Green;
//FastLED.show();
//Serial.println("Request");
}

int lastTemp = -1;
float lastpsi = -1;
int lastRPM = -1;
int lastMPH = -1;

void processPID(CAN_FRAME &frame) {
int temperature;
float psi;
int RPM;
int MPH;

if (frame.data.bytes[1] != 0x41)
return; //not anything we're interested in then

switch (frame.data.bytes[2]) {
case 0x05:
temperature = frame.data.bytes[3] - 40;
if (temperature != lastTemp) {
Serial.print("Coolant temperature (C): ");
Serial.println(temperature);
lastTemp = temperature;
}
break;

case 0x0B:
  psi = frame.data.bytes[3] * 0.145038;  //kPA to PSI
  psi = psi - 14.8;
  //psi = psi * 100;
  if (psi != lastpsi) {
    Serial.print("Manifold abs pressure (psi): ");
    Serial.println(psi);
    lastpsi = psi;
  }
  break;

case 0x0C:
  RPM = ((frame.data.bytes[3] * 256) + frame.data.bytes[4]) / 4;
  if (RPM != lastRPM) {
    Serial.print("Engine RPM: ");
    Serial.println(RPM);
    sprintf(msg_buf, "%d", RPM);
    lastRPM = RPM;
  }
  break;

case 0x0D:
  MPH = frame.data.bytes[3] * 0.621371;
  if (MPH != lastMPH) {
    Serial.print("Vehicle Speed (MPH): ");
    Serial.println(MPH);
    lastMPH = MPH;
  }
  break;

}
}

@weeblebiker
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weeblebiker commented Mar 15, 2023 •
edited

// another A0 example that works

#include "esp32_can.h" // https://github.com/collin80/esp32_can AND https://github.com/collin80/can_common
#include "BluetoothSerial.h"

#define UPDATES_PER_SECOND 100
#define CANPID_RPM 0x0C
#define CAN_REQST_ID 0x7DF
#define CAN_REPLY_ID 0x7E8

uint16_t rpm;
BluetoothSerial SerialBT;

#include <FastLED.h>
#define A0_LED_PIN 2
#define A0_NUM_LEDS 1
#define BRIGHTNESS 64
#define LED_TYPE WS2812B
#define COLOR_ORDER GRB
CRGB leds[A0_NUM_LEDS];

void setup() {
delay(1000);

pinMode(13, OUTPUT); // RGB power transistor ,note: to turn off when sleep mode figured out
digitalWrite(13, LOW);
delay(100);
FastLED.addLeds<LED_TYPE, A0_LED_PIN, COLOR_ORDER>(leds, A0_NUM_LEDS).setCorrection(TypicalLEDStrip);
FastLED.setBrightness(BRIGHTNESS);
leds[0] = CRGB::Red;
FastLED.show();
pinMode(21, OUTPUT); // to HSC_S: CAN transiever silence pin (pull low to communicate)
digitalWrite(21, LOW);
CAN0.setCANPins(GPIO_NUM_4, GPIO_NUM_5);
CAN0.begin(500000);

SerialBT.begin("A0_CAN");

pinMode(26, OUTPUT); // THE CAN LIBRARY HAS THIS PIN FOR INTERRUPT FOR CAN1 (UNSUSED HERE) INPUT WITHOUT PULLUP, FORCE TO OUTPUT INSTEAD TO PREVENT ERRONEOUS INTERRUPTS.
digitalWrite(26, HIGH);

CAN0.watchFor(CAN_REPLY_ID);
CAN0.setCallback(0, callback);
}

void loop() {
requestCar();
if (rpm > 2000) {
leds[0] = CRGB::Green;
FastLED.show();
} else {
leds[0] = CRGB::Blue;
FastLED.show();
}
SerialBT.println(rpm);
delay(1000);
}

void requestCar(void) {
CAN_FRAME outgoing;
outgoing.id = CAN_REQST_ID;
outgoing.length = 8;
outgoing.extended = 0;
outgoing.rtr = 0;
outgoing.data.uint8[0] = 0x02;
outgoing.data.uint8[1] = 0x01;
outgoing.data.uint8[2] = CANPID_RPM;
outgoing.data.uint8[3] = 0x00;
outgoing.data.uint8[4] = 0x00;
outgoing.data.uint8[5] = 0x00;
outgoing.data.uint8[6] = 0x00;
outgoing.data.uint8[7] = 0x00;
CAN0.sendFrame(outgoing);
leds[0] = CRGB::Red;
FastLED.show();
delay(50);
leds[0] = CRGB::Black;
FastLED.show();;
}

void callback(CAN_FRAME *from_car) {
leds[0] = CRGB::Red;
FastLED.show();
delay(20);
leds[0] = CRGB::Black;
FastLED.show();;
if (from_car->data.uint8[2] == CANPID_RPM) {
uint8_t rpmOBDH = from_car->data.uint8[3];
uint8_t rpmOBDL = from_car->data.uint8[4];
rpm = (uint16_t)((256 * rpmOBDH) + rpmOBDL) / (float)4;
}
}

@weeblebiker
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the two above sketches pretty much cover almost everything between the two of them.

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