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Copy pathArduino_hardware_serial_test.ino
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Arduino_hardware_serial_test.ino
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#include "ELMduino.h"
#define ELM_PORT Serial2
ELM327 myELM327;
typedef enum { IDLE,
COOLANT_TEMP,
OIL_TEMP,
ENG_RPM,
THROTTLE,
RELATIVE_THROTTLE,
ABS_THROTTLE_POS_B,
ABS_THROTTLE_POS_C,
ABS_THROTTLE_POS_D,
ABS_THROTTLE_POS_E,
ABS_THROTTLE_POS_F,
COMMAND_THROTTLE_ACTUATOR,
ENGINE_LOAD,
FUEL_TYPE,
FUEL_INJECTION_TIMING,
BATT_VOLT } obd_pid_states;
obd_pid_states obd_state = IDLE;
float coolant_temperature = 0.0;
float oil_temperature = 0.0;
float battery_voltage = 0.0;
float eng_rpm = 0.0;
float throttle = 0.0;
float relativeThrottle = 0.0;
float absThrottlePosB = 0.0;
float absThrottlePosC = 0.0;
float absThrottlePosD = 0.0;
float absThrottlePosE = 0.0;
float absThrottlePosF = 0.0;
float commandedThrottleActuator = 0.0;
float engineLoad = 0.0;
float fuelInjectTiming = 0.0;
uint8_t fuelType;
uint32_t slow_data_last_time = millis();
uint32_t fast_data_last_time = millis();
void setup()
{
#if LED_BUILTIN
pinMode(LED_BUILTIN, OUTPUT);
digitalWrite(LED_BUILTIN, LOW);
#endif
Serial.begin(38400);
ELM_PORT.begin(38400);
Serial.println("Attempting to connect to ELM327...");
if (!myELM327.begin(ELM_PORT, true, 2000))
{
Serial.println("Couldn't connect to OBD scanner");
while (1);
}
Serial.println("Connected to ELM327");
}
void loop()
{
float tempRPM = myELM327.rpm();
if (myELM327.nb_rx_state == ELM_SUCCESS)
{
rpm = (uint32_t)tempRPM;
Serial.print("RPM: "); Serial.println(rpm);
}
else if (myELM327.nb_rx_state != ELM_GETTING_MSG)
myELM327.printError();
switch (obd_state) {
case IDLE:
Serial.println("=========================");
// Schedule PIDs to be read at different rates (slow PIDs and fast PIDs)
if (millis() > slow_data_last_time + 5000) {
slow_data_last_time = millis();
obd_state = BATT_VOLT;
Serial.println("IDLE, query SLOW PIDs at %.3f s\n", slow_data_last_time / 1000.0);
} else if (millis() > fast_data_last_time + 1000) {
fast_data_last_time = millis();
obd_state = COOLANT_TEMP; // Specify the first slow PID here
Serial.println("IDLE, query FAST PIDs at %.3f s\n", fast_data_last_time / 1000.0);
} else {
// Serial.println("[%.3f s] IDLE\n", millis() / 1000.0);
}
break;
case COOLANT_TEMP:
coolant_temperature = myELM327.engineCoolantTemp();
if (myELM327.nb_rx_state == ELM_SUCCESS) {
Serial.println("Coolant temp = %.0f\n", coolant_temperature);
obd_state = OIL_TEMP;
} else if (myELM327.nb_rx_state != ELM_GETTING_MSG) {
myELM327.printError();
obd_state = OIL_TEMP;
}
break;
case OIL_TEMP:
oil_temperature = myELM327.oilTemp();
if (myELM327.nb_rx_state == ELM_SUCCESS) {
Serial.println("Oil temp = %.0f\n", oil_temperature);
obd_state = ENG_RPM;
} else if (myELM327.nb_rx_state != ELM_GETTING_MSG) {
myELM327.printError();
obd_state = ENG_RPM;
}
break;
case ENG_RPM:
eng_rpm = myELM327.rpm();
if (myELM327.nb_rx_state == ELM_SUCCESS) {
Serial.println("Engine RPM = %.0f\n", eng_rpm);
obd_state = THROTTLE;
} else if (myELM327.nb_rx_state != ELM_GETTING_MSG) {
myELM327.printError();
obd_state = THROTTLE;
}
break;
case THROTTLE:
throttle = myELM327.throttle();
if (myELM327.nb_rx_state == ELM_SUCCESS) {
Serial.println("Throttle = %.0f\n", throttle);
obd_state = THROTTLE;
} else if (myELM327.nb_rx_state != ELM_GETTING_MSG) {
myELM327.printError();
obd_state = THROTTLE;
}
break;
case RELATIVE_THROTTLE:
relativeThrottle = myELM327.relativeThrottle();
if (myELM327.nb_rx_state == ELM_SUCCESS) {
Serial.println("Relative Throttle = %.0f\n", relativeThrottle);
obd_state = ABS_THROTTLE_POS_B;
} else if (myELM327.nb_rx_state != ELM_GETTING_MSG) {
myELM327.printError();
obd_state = ABS_THROTTLE_POS_B;
}
break;
case ABS_THROTTLE_POS_B:
absThrottlePosB = myELM327.absThrottlePosB();
if (myELM327.nb_rx_state == ELM_SUCCESS) {
Serial.println("ABS_THROTTLE_POS_B = %.0f\n", absThrottlePosB);
obd_state = ABS_THROTTLE_POS_C;
} else if (myELM327.nb_rx_state != ELM_GETTING_MSG) {
myELM327.printError();
obd_state = ABS_THROTTLE_POS_C;
}
break;
case ABS_THROTTLE_POS_C:
absThrottlePosC = myELM327.absThrottlePosC();
if (myELM327.nb_rx_state == ELM_SUCCESS) {
Serial.println("ABS_THROTTLE_POS_C = %.0f\n", absThrottlePosC);
obd_state = ABS_THROTTLE_POS_D;
} else if (myELM327.nb_rx_state != ELM_GETTING_MSG) {
myELM327.printError();
obd_state = ABS_THROTTLE_POS_D;
}
break;
case ABS_THROTTLE_POS_D:
absThrottlePosD = myELM327.absThrottlePosD();
if (myELM327.nb_rx_state == ELM_SUCCESS) {
Serial.println("ABS_THROTTLE_POS_D = %.0f\n", absThrottlePosD);
obd_state = ABS_THROTTLE_POS_E;
} else if (myELM327.nb_rx_state != ELM_GETTING_MSG) {
myELM327.printError();
obd_state = ABS_THROTTLE_POS_E;
}
break;
case ABS_THROTTLE_POS_E:
absThrottlePosE = myELM327.absThrottlePosE();
if (myELM327.nb_rx_state == ELM_SUCCESS) {
Serial.println("ABS_THROTTLE_POS_E = %.0f\n", absThrottlePosE);
obd_state = ABS_THROTTLE_POS_F;
} else if (myELM327.nb_rx_state != ELM_GETTING_MSG) {
myELM327.printError();
obd_state = ABS_THROTTLE_POS_F;
}
break;
case ABS_THROTTLE_POS_F:
absThrottlePosF = myELM327.absThrottlePosF();
if (myELM327.nb_rx_state == ELM_SUCCESS) {
Serial.println("ABS_THROTTLE_POS_F = %.0f\n", absThrottlePosF);
obd_state = COMMAND_THROTTLE_ACTUATOR;
} else if (myELM327.nb_rx_state != ELM_GETTING_MSG) {
myELM327.printError();
obd_state = COMMAND_THROTTLE_ACTUATOR;
}
break;
case COMMAND_THROTTLE_ACTUATOR:
commandedThrottleActuator = myELM327.commandedThrottleActuator();
if (myELM327.nb_rx_state == ELM_SUCCESS) {
Serial.println("Command Throttle Actuator = %.0f\n", commandedThrottleActuator);
obd_state = COMMAND_THROTTLE_ACTUATOR;
} else if (myELM327.nb_rx_state != ELM_GETTING_MSG) {
myELM327.printError();
obd_state = COMMAND_THROTTLE_ACTUATOR;
}
break;
case ENGINE_LOAD:
engineLoad = myELM327.engineLoad();
if (myELM327.nb_rx_state == ELM_SUCCESS) {
Serial.println("Engine Load = %.0f\n", engineLoad);
obd_state = FUEL_TYPE;
} else if (myELM327.nb_rx_state != ELM_GETTING_MSG) {
myELM327.printError();
obd_state = FUEL_TYPE;
}
break;
case FUEL_TYPE:
fuelType = myELM327.fuelType();
if (myELM327.nb_rx_state == ELM_SUCCESS) {
Serial.println("FUEL TYPE = %.0f\n", fuelType);
obd_state = FUEL_INJECTION_TIMING;
} else if (myELM327.nb_rx_state != ELM_GETTING_MSG) {
myELM327.printError();
obd_state = FUEL_INJECTION_TIMING;
}
break;
case FUEL_INJECTION_TIMING:
fuelInjectTiming = myELM327.fuelInjectTiming();
if (myELM327.nb_rx_state == ELM_SUCCESS) {
Serial.println("FUEL INJECTION TIMING = %.0f\n", fuelInjectTiming);
obd_state = IDLE;
} else if (myELM327.nb_rx_state != ELM_GETTING_MSG) {
myELM327.printError();
obd_state = IDLE;
}
break;
case BATT_VOLT:
battery_voltage = myELM327.batteryVoltage();
if (myELM327.nb_rx_state == ELM_SUCCESS) {
Serial.println("Battery voltage = %.1f\n", battery_voltage);
obd_state = IDLE;
} else if (myELM327.nb_rx_state != ELM_GETTING_MSG) {
myELM327.printError();
obd_state = IDLE;
}
break;
}
}