hydroponic-controller/include/flow.h

#ifndef _FLOW_H_
#define _FLOW_H_

#define FLOW_PIN 19
uint16_t flow_counter=0; //maximum counts/s measured with Eden 128 Pump was 171
void IRAM_ATTR isr_flow();
unsigned long last_read_flow=0;
#define READINTERVAL_FLOW 2000
float flow_factor=7.5; //F=7.5*flowrate[L/min]
float flow;

uint32_t flow_counter_sum=0;



void flow_setup() {

    pinMode(FLOW_PIN, INPUT_PULLUP);
    attachInterrupt(FLOW_PIN, isr_flow, CHANGE);
}

void flow_loop(unsigned long loopmillis) {
  if (loopmillis>=last_read_flow+READINTERVAL_FLOW) {
    flow=flow_counter*1000.0/(loopmillis-last_read_flow)/2.0; //Frequency [Hz]
    flow/=flow_factor; //[L/min]
  
    flow_counter=0;
    last_read_flow=loopmillis;  
  }
}

void IRAM_ATTR isr_flow() {
	flow_counter++;
  flow_counter_sum++;
}


#endif