Add SmartHomeShopIO WaterMeterKit V3 to devices.esphome.io

src/docs/devices/SmartHomeShopIO-WaterMeterKit-V3/index.md

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+---
+title: SmartHomeShopIO WaterMeterKit V3
+date-published: 2026-04-30
+type: sensor
+standard: global
+board: esp32
+project-url: https://github.com/smarthomeshop/watermeterkit/blob/main/watermeterkit-v3/watermeterkit.yaml
+made-for-esphome: true
+difficulty: 1
+---
+
+![WaterMeterKit V3](watermeterkit-product-shop.png "WaterMeterKit V3")
+
+## Description
+
+The **WaterMeterKit V3** is a compact **ESP32-C6** based water meter sensor for compatible analog water meters.
+It tracks **real-time water flow** and **total water usage** using a pulse input and also includes onboard
+**temperature** and **humidity** sensing with the **HDC1080**.
+
+It is designed for fully local use with **ESPHome** and **Home Assistant**, with onboarding through
+**captive portal**, **Improv BLE**, or **Improv Serial**, and supports **HTTP OTA** firmware updates.
+It is also one of the earliest purpose-built ESPHome water meter kits created specifically for Home Assistant users.
+
+### Features
+
+- **ESP32-C6** platform with **Wi-Fi** and **Bluetooth LE**
+- **Pulse meter** based water usage tracking
+- Built-in **HDC1080** temperature and humidity sensing
+- **Improv BLE**, **Improv Serial**, and **captive portal** onboarding
+- **HTTP OTA** firmware update support
+- Fully **local** and **open source**
+
+### Specifications
+
+- MCU: **ESP32-C6**
+- Flash: **4 MB**
+- Water meter interface: **Pulse input**
+- Sensors: **HDC1080** temperature and humidity
+- Firmware: **ESPHome**
+
+## Variants
+
+- **WaterMeterKit V3** — ESP32-C6 hardware revision with Wi-Fi firmware
+
+## Quickstart
+
+1. Install the WaterMeterKit on a compatible analog water meter.
+2. Power the device.
+3. Onboard it using the fallback hotspot, **Improv BLE**, or **Improv Serial**.
+4. Adopt the device in **Home Assistant** / **ESPHome**.
+5. Monitor live flow rate, total consumption, temperature, and humidity.
+
+Please check our [full documentation and Quick Start Guide](https://smarthomeshop.io/quick-start-watermeterkit)
+and our [compatible water meters overview](https://watermeterkit.nl/en/) to confirm fitment for your meter type.
+
+## Links
+
+- [Shop](https://watermeterkit.nl/en)
+- [Compatible Water Meters](https://watermeterkit.nl/en)
+- [GitHub](https://github.com/smarthomeshop/watermeterkit)
+- [Firmware](https://smarthomeshop.io/en/firmware)
+- [Quick Start Guide](https://smarthomeshop.io/quick-start-watermeterkit)
+- [Discord](https://smarthomeshop.io/discord)
+
+## Product Images
+
+| Product view                                      | In the box                                        |
+| ------------------------------------------------- | ------------------------------------------------- |
+| ![Product view](watermeterkit-product-shop.png)   | ![In the box](watermeterkit-inthebox-shop.png)    |