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/**
* 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) 2013-2015 Sensnology AB
* Full contributor list: https://github.com/mysensors/Arduino/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_NRF24
//#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++;
}