irFerraris.ino

/***************************************************************************
  IR Ferraris Reader
  2019 Adlerweb//Bitbastelei
  Florian Knodt - www.adlerweb.info

  Note: Just a few minutes of coding, not heavily tested, etc
 ***************************************************************************/

#include <Arduino.h>

const unsigned int rpm_per_kWh = 75;

#define IRPIN D1
#define RED LOW
#define SILVER HIGH

//in 10ms = 200ms
#define MINTIME 20

////////END OF CONFIGURATION////////

// 0 = Silver->Red; 1 = Red->Silver
bool lastState = 0;
unsigned long lastmillis = 0;
unsigned long pendingmillis = 0;
bool inbuf[MINTIME];
bool startup=true;

void setup() {
  Serial.begin(115200);
  delay(3000);
  Serial.println("\nPOWER MONITOR - BOOT\n");

  pinMode(IRPIN, INPUT_PULLUP);
  pinMode(LED_BUILTIN, OUTPUT);
  lastmillis = millis();
}

bool getInput(uint8_t pin) {
  byte inchk=0;
  for(byte i=0; i<5; i++) {
    inchk += digitalRead(pin);
    delay(2);
  }
  if(inchk >= 3) return 1;
  return 0;
}

bool procInput(bool state) {
  byte inchk=0;

  //Array shift
  for (byte k = MINTIME-2; (k >= 0 && k < MINTIME); k--) {
    inbuf[k+1] = inbuf[k];
    inchk += inbuf[k];
  }
  
  //New value
  inbuf[0] = state;
  inchk += state;
  
  //Return average
  if(inchk > MINTIME/2) return 1;
  return 0;
}

void calcPower(void)  {
  unsigned long took = pendingmillis - lastmillis;
  lastmillis = pendingmillis;

  float kWh = 3600000.00 / took / rpm_per_kWh;

  if(!startup) {
    Serial.print(kWh);
    Serial.print(" kW @ ");
    Serial.print(took);
    Serial.println("ms");

    //Add MQTT, HTTP or whatever you want to do with the measurement here

    digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
  }else{
    startup=false;
  }
}

void loop() {
  bool cur = getInput(IRPIN);
  cur = procInput(cur);

  switch(lastState) {
    case 0: //Silver; Waiting for transition to red
      if(cur != SILVER) {
        lastState++;
        pendingmillis = millis();
        Serial.println("Silver detected; waiting for red");
        calcPower();
      }
      break;
    case 1: //Red; Waiting for transition to silver
      if(cur != RED) {
        lastState=0;
        Serial.println("Red detected; Waiting for silver");
      }
      break;
  }
}

Zeile 23 sollte eher ein uint8_t anstatt bool sein. Das kompiliert aktuell nicht (mehr, falls es das schonmal hat:-) ). Arduino-IDE2 sagt, bool++ ist nicht erlaubt.