@mfalkvidd Many thanks!

@mfalkvidd Many thanks!

In the example code, I am trying to understand the sleep behaviour. In testing, if I set sleep time to 10 mins it works fine and counts pulses. Then every 10 minutes it sends the data to Domoticz.

My question is that I understood an ISR would return to the main loop when done, in this case counting one pulse. If this is the case however, it would then send the data to gateway since the pulse count is different.

Instead it seems to be just counting the pulses and returning back to sleep until the sleep timer runs out. Then if the pulse counts are different, sends the count to gw and repeats. Hence the 10 minute updates.

I clearly don't understand sometging here, can anyone please explain? Many thanks.

/*
 * The MySensors Arduino library handles the wireless radio link and protocol
 * between your home built sensors/actuators and HA controller of choice.
 * The sensors forms a self healing radio network with optional repeaters. Each
 * repeater and gateway builds a routing tables in EEPROM which keeps track of the
 * network topology allowing messages to be routed to nodes.
 *
 * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
 * Copyright (C) 2013-2018 Sensnology AB
 * Full contributor list: https://github.com/mysensors/MySensors/graphs/contributors
 *
 * Documentation: http://www.mysensors.org
 * Support Forum: http://forum.mysensors.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 *******************************
 *
 * REVISION HISTORY
 * Version 1.0 - Henrik Ekblad
 * Version 1.1 - GizMoCuz
 *
 * DESCRIPTION
 * Use this sensor to measure volume and flow of your house water meter.
 * You need to set the correct pulsefactor of your meter (pulses per m3).
 * The sensor starts by fetching current volume reading from gateway (VAR 1).
 * Reports both volume and flow back to gateway.
 *
 * Unfortunately millis() won't increment when the Arduino is in
 * sleepmode. So we cannot make this sensor sleep if we also want
 * to calculate/report flow.
 * http://www.mysensors.org/build/pulse_water
 */

// Enable debug prints to serial monitor
#define MY_DEBUG

// Enable and select radio type attached
#define MY_RADIO_RF24
//#define MY_RADIO_NRF5_ESB
//#define MY_RADIO_RFM69
//#define MY_RADIO_RFM95

#include <MySensors.h>

#define DIGITAL_INPUT_SENSOR 3                  // The digital input you attached your sensor.  (Only 2 and 3 generates interrupt!)

#define PULSE_FACTOR 1000                       // Number of blinks per m3 of your meter (One rotation/liter)

#define SLEEP_MODE false                        // flowvalue can only be reported when sleep mode is false.

#define MAX_FLOW 40                             // Max flow (l/min) value to report. This filters outliers.

#define CHILD_ID 1                              // Id of the sensor child

uint32_t SEND_FREQUENCY =
    30000;           // Minimum time between send (in milliseconds). We don't want to spam the gateway.

MyMessage flowMsg(CHILD_ID,V_FLOW);
MyMessage volumeMsg(CHILD_ID,V_VOLUME);
MyMessage lastCounterMsg(CHILD_ID,V_VAR1);

double ppl = ((double)PULSE_FACTOR)/1000;        // Pulses per liter

volatile uint32_t pulseCount = 0;
volatile uint32_t lastBlink = 0;
volatile double flow = 0;
bool pcReceived = false;
uint32_t oldPulseCount = 0;
uint32_t newBlink = 0;
double oldflow = 0;
double volume =0;
double oldvolume =0;
uint32_t lastSend =0;
uint32_t lastPulse =0;

void setup()
{
	// initialize our digital pins internal pullup resistor so one pulse switches from high to low (less distortion)
	pinMode(DIGITAL_INPUT_SENSOR, INPUT_PULLUP);

	pulseCount = oldPulseCount = 0;

	// Fetch last known pulse count value from gw
	request(CHILD_ID, V_VAR1);

	lastSend = lastPulse = millis();

	attachInterrupt(digitalPinToInterrupt(DIGITAL_INPUT_SENSOR), onPulse, FALLING);
}

void presentation()
{
	// Send the sketch version information to the gateway and Controller
	sendSketchInfo("Water Meter", "1.1");

	// Register this device as Water flow sensor
	present(CHILD_ID, S_WATER);
}

void loop()
{
	uint32_t currentTime = millis();

	// Only send values at a maximum frequency or woken up from sleep
	if (SLEEP_MODE || (currentTime - lastSend > SEND_FREQUENCY)) {
		lastSend=currentTime;

		if (!pcReceived) {
			//Last Pulsecount not yet received from controller, request it again
			request(CHILD_ID, V_VAR1);
			return;
		}

		if (!SLEEP_MODE && flow != oldflow) {
			oldflow = flow;

			Serial.print("l/min:");
			Serial.println(flow);

			// Check that we don't get unreasonable large flow value.
			// could happen when long wraps or false interrupt triggered
			if (flow<((uint32_t)MAX_FLOW)) {
				send(flowMsg.set(flow, 2));                   // Send flow value to gw
			}
		}

		// No Pulse count received in 2min
		if(currentTime - lastPulse > 120000) {
			flow = 0;
		}

		// Pulse count has changed
		if ((pulseCount != oldPulseCount)||(!SLEEP_MODE)) {
			oldPulseCount = pulseCount;

			Serial.print("pulsecount:");
			Serial.println(pulseCount);

			send(lastCounterMsg.set(pulseCount));                  // Send  pulsecount value to gw in VAR1

			double volume = ((double)pulseCount/((double)PULSE_FACTOR));
			if ((volume != oldvolume)||(!SLEEP_MODE)) {
				oldvolume = volume;

				Serial.print("volume:");
				Serial.println(volume, 3);

				send(volumeMsg.set(volume, 3));               // Send volume value to gw
			}
		}
	}
	if (SLEEP_MODE) {
		sleep(SEND_FREQUENCY);
	}
}

void receive(const MyMessage &message)
{
	if (message.type==V_VAR1) {
		uint32_t gwPulseCount=message.getULong();
		pulseCount += gwPulseCount;
		flow=oldflow=0;
		Serial.print("Received last pulse count from gw:");
		Serial.println(pulseCount);
		pcReceived = true;
	}
}

void onPulse()
{
	if (!SLEEP_MODE) {
		uint32_t newBlink = micros();
		uint32_t interval = newBlink-lastBlink;

		if (interval!=0) {
			lastPulse = millis();
			if (interval<500000L) {
				// Sometimes we get interrupt on RISING,  500000 = 0.5 second debounce ( max 120 l/min)
				return;
			}
			flow = (60000000.0 /interval) / ppl;
		}
		lastBlink = newBlink;
	}
	pulseCount++;
}
``