Zigbee waterflow meter for Clack valve using ESP32-C6

2025-03-28

This is a personal project, based on this tutorial and Ai aid.

I am using this ESP32-C6 Development Kit and Arduino IDE.

Arduino IDE settings:

USB CDC On Boot: "Enabled"
CPU Frequency: "160MHz (WiFi)"
Core Debug Level: "None"
Erase All Flash Before Sketch Upload: "Disabled"
Flash Frequency: "80MHz"
Flash Mode: "QIO"
Flash Size: "4MB (32Mb)"
JTAG Adapter: "Disabled"
Partition Scheme: "Zigbee 4MB with spiffs"
Upload Speed: "115200"
Zigbee Mode: "Zigbee ED (end device)"

It will do the following:

LED is red prior to connecting to Zigbee, it turns green when connected
LED will blink when PIN 10 reads some pulses
Pin 10 will read the pulse from the Clack WS-1 meter and calculate the water usage, unit is Litre
It will report the data via Zigbee, to be used on Home Assistant
It will save the reading to the ESP32-C6 board, treated like a real water meter.

Code

#include <Preferences.h>
#include "Zigbee.h"

#define WATER_PIN 10
#define PULSES_PER_LITER 17
#define FLOW_SENSOR_ENDPOINT_NUMBER 10
#define SAVE_INTERVAL 1800000  // 30 minutes in milliseconds
#define RGB_BRIGHTNESS 50  // LED brightness

Preferences preferences;
int pulseCount = 0;
float totalLiters = 0.0;
bool isLowVoltage = true;
bool isConnected = false;
uint32_t lastReportTime = 0;
uint32_t lastSaveTime = 0;

ZigbeeFlowSensor zbFlowSensor = ZigbeeFlowSensor(FLOW_SENSOR_ENDPOINT_NUMBER);

void setLEDColor(uint8_t red, uint8_t green, uint8_t blue) {
#ifdef RGB_BUILTIN
    rgbLedWrite(RGB_BUILTIN, red, green, blue);
#endif
}

void saveToNVS() {
    preferences.putFloat("totalLiters", totalLiters);
    Serial.println("Saved to NVS");
}

void loadFromNVS() {
    totalLiters = preferences.getFloat("totalLiters", 0.0);
    Serial.printf("Loaded from NVS: %.3f L\n", totalLiters);
}

void setup() {
    Serial.begin(115200);
    pinMode(WATER_PIN, INPUT_PULLUP);

    preferences.begin("water_meter", false);
    loadFromNVS();

    setLEDColor(RGB_BRIGHTNESS, 0, 0);  // Red at start

    zbFlowSensor.setManufacturerAndModel("Espressif", "ZigbeeWaterMeter");
    Zigbee.addEndpoint(&zbFlowSensor);

    Serial.println("Starting Zigbee...");
    if (!Zigbee.begin()) {
        Serial.println("Zigbee failed to start! Rebooting...");
        ESP.restart();
    }

    while (!Zigbee.connected()) {
        delay(100);
    }
    isConnected = true;
    setLEDColor(0, RGB_BRIGHTNESS, 0);  // Green when connected
    zbFlowSensor.setReporting(0, 60, 1.0);
}

void loop() {
    int waterValue = digitalRead(WATER_PIN);
    if (waterValue == LOW) {
        if (isLowVoltage) {
            pulseCount++;
            isLowVoltage = false;
            totalLiters += 1.0 / PULSES_PER_LITER;
            zbFlowSensor.setFlow(totalLiters);
            Serial.printf("Total Water Usage: %.3f L\n", totalLiters);
            
            // Blink LED to indicate water flow
            if (isConnected) {
                setLEDColor(0, 0, 0);  // Off
                delay(100);
                setLEDColor(0, RGB_BRIGHTNESS, 0);  // Back to green
            }
        }
    } else {
        isLowVoltage = true;
    }

    if (millis() - lastReportTime >= 60000) {  // Report to HA every 60s
        zbFlowSensor.report();
        lastReportTime = millis();
    }

    if (millis() - lastSaveTime >= SAVE_INTERVAL) {  // Save to NVS every 30 minutes
        saveToNVS();
        lastSaveTime = millis();
    }
}

Add a sensor on configuration.yaml on Home Assistant:

- sensor:
      - name: "Total Water Usage"
        unique_id: total_water_usage
        state: "{{ states('sensor.espressif_zigbeewatermeter') | float(0) }}"
        unit_of_measurement: "L"
        device_class: water
        state_class: total_increasing

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