mirror of
https://github.com/SemvdH/OBD2-car-display.git
synced 2025-12-15 20:21:03 +00:00
135 lines
2.6 KiB
C++
135 lines
2.6 KiB
C++
#include "ELMduino.h"
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#define ELM_PORT Serial2
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ELM327 myELM327;
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typedef enum
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{
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ENG_COOLANT_TEMP,
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ENG_FUEL_PRESSURE,
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ENG_MANIFOLD_PRESSURE,
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RPM
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} obd2_state;
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float rpm = 0;
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float cool_temp = 0;
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uint8_t man_pres = 0;
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float fuel_pres = 0;
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obd2_state current_state = ENG_COOLANT_TEMP;
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void setup()
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{
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#if LED_BUILTIN
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pinMode(LED_BUILTIN, OUTPUT);
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digitalWrite(LED_BUILTIN, LOW);
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#endif
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Serial.begin(115200);
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ELM_PORT.begin(115200);
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// int bt_state = digitalRead(11);
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// while (bt_state == 0)
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// {
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// bt_state = digitalRead(11);
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// Serial.println(bt_state);
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// Serial.println("bt not connected");
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// delay(500);
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// }
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// Serial.println("bt connected");
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Serial.println("Attempting to connect to ELM327...");
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if (!myELM327.begin(ELM_PORT, false, 2000))
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{
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Serial.println("Couldn't connect to OBD scanner");
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while (1);
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}
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Serial.println(myELM327.connected);
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Serial.println("Connected to ELM327");
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}
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void loop()
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{
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switch (current_state)
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{
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case ENG_COOLANT_TEMP:
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{
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cool_temp = myELM327.engineCoolantTemp();
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if (myELM327.nb_rx_state == ELM_SUCCESS)
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{
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Serial.print("coolant temp: ");
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Serial.println(cool_temp);
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current_state = ENG_FUEL_PRESSURE;
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}
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else if (myELM327.nb_rx_state != ELM_GETTING_MSG)
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{
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myELM327.printError();
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//current_state = ENG_FUEL_PRESSURE;
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}
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break;
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}
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case ENG_FUEL_PRESSURE:
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{
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fuel_pres = myELM327.fuelPressure();
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if (myELM327.nb_rx_state == ELM_SUCCESS)
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{
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Serial.print("fuel pressure: ");
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Serial.println(fuel_pres);
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current_state = ENG_MANIFOLD_PRESSURE;
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}
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else if (myELM327.nb_rx_state != ELM_GETTING_MSG)
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{
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myELM327.printError();
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//current_state = ENG_MANIFOLD_PRESSURE;
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}
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break;
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}
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case ENG_MANIFOLD_PRESSURE:
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{
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man_pres = myELM327.manifoldPressure();
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if (myELM327.nb_rx_state == ELM_SUCCESS)
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{
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Serial.print("manifold pressure: ");
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Serial.println(man_pres);
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current_state = RPM;
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}
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else if (myELM327.nb_rx_state != ELM_GETTING_MSG)
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{
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myELM327.printError();
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//current_state = RPM;
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}
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break;
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}
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case RPM:
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{
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rpm = myELM327.rpm();
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if (myELM327.nb_rx_state == ELM_SUCCESS)
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{
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Serial.print("rpm: ");
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Serial.println(rpm);
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current_state = ENG_COOLANT_TEMP;
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}
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else if (myELM327.nb_rx_state != ELM_GETTING_MSG)
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{
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myELM327.printError();
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//current_state = ENG_COOLANT_TEMP;
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}
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break;
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}
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}
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}
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