#define INJECTOR_PIN 2
#define PUMP_PIN 3
#define MAF_PIN A0
#define SOLENOID1_PIN 4
#define SOLENOID2_PIN 5
#define SOLENOID3_PIN 6
unsigned long pulseDuration, pulseFrequency, previousMillis = 0;
double pulseProduct;
//-------------------------------------------------------------
void setup() {
  Serial.begin(115200);
  pinMode(INJECTOR_PIN, INPUT);
  pinMode(PUMP_PIN, OUTPUT);
  pinMode(MAF_PIN, INPUT);
  pinMode(SOLENOID1_PIN, OUTPUT);
  pinMode(SOLENOID2_PIN, OUTPUT);
  pinMode(SOLENOID3_PIN, OUTPUT);
  Serial.println(" Start");
}
//-------------------------------------------------------------
void loop() {
  if (millis() - previousMillis >= 50) {
    previousMillis = millis();
    pulseDuration = pulseIn(INJECTOR_PIN, HIGH);
    pulseFrequency = 60000 / pulseDuration; // Frequency in minutes
    pulseProduct = pulseDuration * pulseFrequency;
    
    if (pulseFrequency > 25) {
      analogWrite(PUMP_PIN, pulseProduct * 4);
    } else if (pulseProduct == 0.3) {
      analogWrite(PUMP_PIN, 0.18 * 255);
    } else if (pulseProduct == 5.7) {
      analogWrite(PUMP_PIN, 255);
    } else {
      analogWrite(PUMP_PIN, 0);
    }
    float mafVoltage = analogRead(MAF_PIN) * (5.0 / 1023.0);
    Serial.println(analogRead(MAF_PIN));
    if (mafVoltage > 1.7) {
      analogWrite(SOLENOID1_PIN, 0.5 * 255);
    }
    if (mafVoltage > 2.8) {
      analogWrite(SOLENOID2_PIN, 0.5 * 255);
    }
    if (mafVoltage > 3.9) {
      analogWrite(SOLENOID3_PIN, 0.5 * 255);
    }
  }
}