Cześć Elektroda community! I’m new here, just starting with automotive electronics, and thrilled to join this awesome forum! I’m working on a DIY project to build a simple OBD-II reader using an Arduino to monitor my car’s fuel efficiency (e.g., liters per 100 km). I want to read real-time data like MAF (mass airflow) or fuel rate from my car’s OBD-II port and display it on a small LCD.
Here’s my basic setup so far:
Hardware: Arduino Uno, ELM327 OBD-II module (Bluetooth), 16x2 LCD.
Code (rough sketch):
As a beginner, I’m hitting some roadblocks:
How do I properly connect the ELM327 to Arduino and parse OBD-II PIDs (e.g., for fuel rate or MAF)?
Which PIDs are best for calculating real-time fuel efficiency?
Any tips for making the LCD display user-friendly (e.g., showing liters/100 km)?
Has anyone built a similar OBD-II project? I’d love your advice or code snippets to make this work smoothly! Thanks for helping a newbie out!
Here’s my basic setup so far:
Hardware: Arduino Uno, ELM327 OBD-II module (Bluetooth), 16x2 LCD.
Code (rough sketch):
#include <SoftwareSerial.h>
#include <LiquidCrystal.h>
SoftwareSerial obdSerial(10, 11); // RX, TX for ELM327
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
void setup() {
obdSerial.begin(9600);
lcd.begin(16, 2);
lcd.print("OBD-II Reader");
obdSerial.println("ATZ"); // Reset ELM327
delay(1000);
obdSerial.println("010C"); // Request engine RPM (example)
}
void loop() {
if (obdSerial.available()) {
String data = obdSerial.readString();
lcd.setCursor(0, 1);
lcd.print("Data: " + data);
}
}As a beginner, I’m hitting some roadblocks:
How do I properly connect the ELM327 to Arduino and parse OBD-II PIDs (e.g., for fuel rate or MAF)?
Which PIDs are best for calculating real-time fuel efficiency?
Any tips for making the LCD display user-friendly (e.g., showing liters/100 km)?
Has anyone built a similar OBD-II project? I’d love your advice or code snippets to make this work smoothly! Thanks for helping a newbie out!
