hydroponic-controller/include/flow.h

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#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 1000
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) {
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if (loopmillis>=last_read_flow+READINTERVAL_FLOW) {
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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