Hi!
I am working on a car data logger project where I basically log data from GPS and OBD(UART) to an sd card
It was working great while testing the OBD2-UART serial, but when I tried to finally run my final code, which I use ELMduino, the OBD2 port stopped working and my car's instrument cluster shutdown. I guess it burned one fuse. What are the possible mistakes that I've made?
THanks, if necessary I can send my code
Unless a component of your circuit has a major short, or the CAM connection has a GND or V+ voltage wire switched, even in this scenario, these devices fuses onboard are wayyyyy weaker than your cars fuses and will blow first, or you will have a catastrophic failure onboard the arduino or another of your components.
Sounds like you may have had a internal car electrical issue as these units can not draw enough amperage to even think of blowing a cars fuse.
ALSO: Posting your code may give us a clue!!!
Thanks @whizatit
I just think it's too much coincidence as I never had any electric issues with my car.
The instrument cluster and the OBD stopped working, and as I checked there is a fuse for these.
code:
#include <Adafruit_GPS.h>
#include <SoftwareSerial.h>
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <SD.h>
#include <ELMduino.h>
#define GPSSerial Serial1
// Connect to the GPS on the hardware port
Adafruit_GPS GPS(&GPSSerial);
//obd ports
#define ELM_PORT Serial2
ELM327 myELM327;
const int chipSelectSD = 53;
#define PMTK_SET_NMEA_UPDATE_1HZ "$PMTK220,1000*1F"
#define PMTK_SET_NMEA_UPDATE_5HZ "$PMTK220,200*2C"
#define PMTK_SET_NMEA_UPDATE_10HZ "$PMTK220,100*2F"
// turn on only the second sentence (GPRMC)
#define PMTK_SET_NMEA_OUTPUT_RMCONLY "$PMTK314,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29"
// turn on GPRMC and GGA
#define PMTK_SET_NMEA_OUTPUT_RMCGGA "$PMTK314,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*28"
// turn on ALL THE DATA
#define PMTK_SET_NMEA_OUTPUT_ALLDATA "$PMTK314,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0*28"
// turn off output
#define PMTK_SET_NMEA_OUTPUT_OFF "$PMTK314,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*28"
#define PMTK_Q_RELEASE "$PMTK605*31"
#define GPSECHO true
const byte SCREEN_WIDTH = 128; // OLED display width, in pixels
const byte SCREEN_HEIGHT = 64; // OLED display height, in pixels
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
const int OLED_RESET = -1; // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
void setup() {
while (!Serial); // wait for Serial to be ready
Serial.begin(115200); // The serial port for the Arduino IDE port output
GPS.begin(9600);
delay(2000);
// initialize with the I2C addr 0x3C
display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
// Clear the buffer.
display.clearDisplay();
// Display Text "Hello Word"
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(0,28);
if (!SD.begin(chipSelectSD))
{
display.println("Falha ao acessar o cartao !");
Serial.println("Verifique o cartao/conexoes e reinicie o Arduino...");
display.print("Cartao SD nao esta funcionando!");
display.display();
return;
}
display.println("Cartao iniciado corretamente !");
Serial.println();
ELM_PORT.begin(9600);
Serial.println("Attempting to connect to ELM327...");
if (!myELM327.begin(ELM_PORT, false, 5000))
{
Serial.println("Couldn't connect to OBD scanner");
//while (1);
}
Serial.println("Connected to ELM327");
}
uint32_t timer = millis();
void loop() // run over and over again
{
char c = GPS.read();
// if you want to debug, this is a good time to do it!
/*
if ((c) && (GPSECHO))
Serial.write(c);
*/
// if a sentence is received, we can check the checksum, parse it...
if (GPS.newNMEAreceived()) {
// a tricky thing here is if we print the NMEA sentence, or data
// we end up not listening and catching other sentences!
// so be very wary if using OUTPUT_ALLDATA and trytng to print out data
//Serial.println(GPS.lastNMEA()); // this also sets the newNMEAreceived() flag to false
if (!GPS.parse(GPS.lastNMEA())) // this also sets the newNMEAreceived() flag to false
return; // we can fail to parse a sentence in which case we should just wait for another
}
// approximately every 2 seconds or so, print out the current stats
if (millis() - timer > 2000) {
timer = millis(); // reset the timer
File dataFile = SD.open("datalog.txt", FILE_WRITE);
Serial.print("\nTime: ");
printGPSTime(GPS.day, GPS.month, GPS.year, GPS.hour, GPS.minute, GPS.seconds, GPS.milliseconds, Serial);
Serial.println("");
Serial.print(GPS.day, DEC); Serial.print('/');
Serial.print(GPS.month, DEC); Serial.print("/20");
Serial.println(GPS.year, DEC);
Serial.print("Fix: "); Serial.print((int)GPS.fix);
Serial.print(" quality: "); Serial.println((int)GPS.fixquality);
// show sensors status
display.clearDisplay();
display.setCursor(0,28);
display.print("Satellites: ");
display.print((int)GPS.satellites);
// check obd connection
display.println("");
display.print("OBDII: ");
display.print(myELM327.connected);
// sd
display.println("");
display.print("SD: ");
display.print(dataFile);
display.display();
if (GPS.fix) {
//ETCG Notes -- The Following Gives Coordinates in formant you can plug into
//Google Maps (Degrees)
Serial.println("Location in Degrees");
Serial.print(GPS.latitudeDegrees, 8);
Serial.print(", ");
Serial.println(GPS.longitudeDegrees, 8);
Serial.print("Speed (knots): "); Serial.println(GPS.speed);
Serial.print("Angle: "); Serial.println(GPS.angle);
Serial.print("Altitude: "); Serial.println(GPS.altitude);
Serial.print("Satellites: "); Serial.println((int)GPS.satellites);
//Grava as informacoes no arquivo
if (dataFile)
{
printGPSTime(GPS.day, GPS.month, GPS.year, GPS.hour, GPS.minute, GPS.seconds, GPS.milliseconds, dataFile);
dataFile.print(",");
dataFile.print(GPS.latitudeDegrees, 8);
dataFile.print(",");
dataFile.print(GPS.longitudeDegrees, 8);
//dataFile.println("");
//Fecha o arquivo
}
}
// if not gps fix
else{
dataFile.print(",,,");
}
// car info
if (myELM327.connected){
float tempRPM = myELM327.rpm();
float kph = myELM327.kph();
float oilTemp = myELM327.oilTemp();
float coolTemp = myELM327.engineCoolantTemp();
float fuelPr = myELM327.fuelPressure();
float torque = myELM327.torque();
if (myELM327.nb_rx_state == ELM_SUCCESS)
{
if (dataFile) {
dataFile.print(tempRPM);
dataFile.print(",");
dataFile.print(kph);
dataFile.print(",");
dataFile.print(oilTemp);
dataFile.print(",");
dataFile.print(coolTemp);
dataFile.print(",");
dataFile.print(fuelPr);
dataFile.print(",");
dataFile.print(torque);
}
}
}
if(dataFile){
dataFile.println("");
dataFile.close();
}
}
}
void printGPSTime(int day, int month, int year, int hour, int minute, int seconds, int milliseconds, Stream &stream){
stream.print(day, DEC); stream.print('/');
stream.print(month, DEC); stream.print("/20");
stream.print(year, DEC);
stream.print(" ");
if (hour < 10) { stream.print('0'); }
stream.print(hour, DEC); stream.print(':');
if (minute < 10) { stream.print('0'); }
stream.print(minute, DEC); stream.print(':');
if (seconds < 10) { stream.print('0'); }
stream.print(seconds, DEC); stream.print('.');
if (milliseconds < 10) {
stream.print("00");
} else if (milliseconds > 9 && milliseconds < 100) {
stream.print("0");
}
stream.print(milliseconds);
}
Were there any errors given? Connection issues to car or any of the arduino accessories? Before or after the fuse blew?
I was having exactly this problem. Attempting to use library with Sparkfun OBD II UART board · Issue #111 · PowerBroker2/ELMduino · GitHub
Solved by increasing the timeout to 5s
before fuse blew. after that, no errors
Your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advice on) your project.
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